Chapter 5: Managing Server Farms

Table Of Contents

Managing Server Farms

Server Farms

Viewing Server Farms

Adding Server Farms

Adding Multiple Real Servers

Editing Server Farms

Health Checkup

Redirect Virtual Server

Viewing a Server Farm Node

Adding a Named Real Server

Adding an Unnamed Real Server

Editing a Real Server

Redirect Virtual Servers

Adding a Redirect Virtual Server

Editing Redirect Virtual Servers

NAT Pools

Viewing NAT Pools

Adding NAT Pools

Editing NAT Pools

Managing Server Farms

From the Server Farms page, you can do the following:

•Configure server farms.

•Specify load balancing algorithm, and monitor in-band health for each server farm.

•Configure a set of real servers and their attributes.

•Configure client NAT pools.

•Configure redirect virtual servers and their attributes.

•Configure health monitoring probes, and enable inband health checkup.

•Direct the traffic to the SSL daughter card.

This section includes the following topics:

• Server Farms

• NAT Pools

Server Farms

A server farm (or server pool) is a collection of servers that contain the same content. You can specify the server farm name when you configure the server farm and add real servers to it, and when you bind the server farm to a virtual server.

When you configure server farms, do the following:

•Name the server farm.

•Configure a load-balancing algorithm (predictor) and other attributes of the farm.

•Configure client NAT pools.

•Configure a set of real servers and their attributes.

•Configure in-band health monitoring for each server farm.

Related Topics:

• Viewing Server Farms

• Adding Server Farms

• Editing Server Farms

• Viewing a Server Farm Node

• Adding a Named Real Server

• Adding an Unnamed Real Server

• Editing a Real Server

• Redirect Virtual Servers

Viewing Server Farms

Figure 5-1 Server Farms Page

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

The Server Farm dialog box appears with the following columns.

Column

Description

Name

Name of the server farm.

Predictor

Type of load-balancing algorithm used by the server farm. If not specified, the default is Round Robin.

It can be one of the following:

•Round Robin—Selects the next server in the list of real servers.

•Least Connections—Selects the server with the least number of connections.

•Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables.

•Hash URL—Selects the server using a hash value, based on the URL.

•Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.

NAT

Shows whether server and client Network Address Translation (NAT) is enabled.

Reals

Number of real servers configured in the server farm.

Redirects

Shows the number of redirect virtual servers configured in the server farm.

Return Code Map

Specifies the return code map associated with the server farm.

From this dialog box, you can do the following:

•Click Add to add server farms. For more information, see Adding Server Farms.

•Select a server farm and click Edit to edit its configurations. For more information, see Editing Server Farms.

•Select a server farm and click Delete to delete it.

Adding Server Farms

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Click Add to create a new server farm. The Add Server Farm dialog box appears.

Step 3 Click one of the following tabs, then proceed to the corresponding section for configuration information:

• General

• Real Servers

• Health Checkup

• Redirect Virtual Server

General

When you click on the General tab, the following information appears:

Column

Descriptions

Name

Enter the name of the server farm.

Predictor

Load-Balancing Algorithm

Specify the load-balancing algorithm for the server farm from the list. Based on the load balancing algorithm the traffic will be diverted to the respective real server. If not specified, the default is Round Robin.

It can be one of the following:

•Round Robin—Selects the next server in the list of real servers.

•Least Connections—Selects the server with the least number of connections.

•Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables.

•Hash URL—Selects the server using a hash value, based on the URL.

•Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.

Mask Type

It can be source, destination, or both.

This field is enabled only for Hash Address algorithm type.

Mask

The mask of the real server in the server farm. This field is enabled only for Hash Address algorithm type.

NAT

Server NAT

Select the check box to enable Server NAT.

Client NAT

Select the check box to enable Client NAT.

Back-End SSL encryption

Select the check box to enable backend SSL encryption.

This field will be enabled only when you select the Server NAT check box.

Pool

Enter the name of the client pool. You can modify this field only if client NAT is enabled in this server farm.

Click and select one of the following:

•Select Pool—Opens the Client NAT Pool Selector dialog box and allows you to select a client pool from the list.

•Create Pool—Opens the Add NAT Pool dialog box and allows you to create a client pool. For more information, see Adding NAT Pools.

•Clear Pool—Allows you to clear the field.

Real Servers

When you select the Real Servers tab, the following information appears:

Column

Description

Real

Name of real servers configured in the server farm.

Local

Indicates if this real server is the SSL daughter card.

Min. Connections

The minimum number of connections for the real server.

Max. Connections

The maximum number of connections for the real server.

Weight

Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.

Admin Status

Lets you know if the status of the real server.

From this dialog box, you can do the following:

•Click Add and select one of the following:

–Select Named Real Server—Opens the Add Named Real Server dialog box. For more information, see "Adding a Named Real Server" section.

–Create Unnamed Real Server—Opens the Add Unnamed Real Server dialog box. For more information, see "Adding an Unnamed Real Server" section.

–Add Multiple Real Servers—Opens the Real Server Selector and allows you to add multiple real servers. For more information, see Adding Multiple Real Servers.

•Select a real server and click Edit to edit its configurations. For more information, see "Editing a Real Server" section.

•Select a real server and click Delete to delete it.

Health Checkup

When you select the Health Checkup tab, the following information appears:

Column

Description

Fail Action

From the list, specify the behavior of the connection when the real server fails. It can be one of the following:

•None

•Purge

•Reassign

Return Code Map

Specify the return code map.

Click and select one of the following:

•Select Return Code Map—Opens the Return Code Map Selector dialog box. Allows you to select a return code map from the list.

•Create Return Code Map—Opens the Add Return Code Map dialog box to create a return code map. For more information, see Adding a Return Code Map, page 8-13.

•Clear Return Code Map to clear the field.

Inband Health Checkup

Select the check box to enable inband health monitoring for all the servers in the server farm. You can set the retry attempts and the number of retries.

Number of Retries

Enter the number of consecutive connection attempts before considering the real server failed.

Retry Interval

Enter the retry interval in seconds.

Associated Probes

Name

You can see the probes associated to the server farm.

From this dialog box, you can do the following:

•Click Add under the Associated Probes pane, to choose a probe from the list and associate it to the real server.

•Click Delete under the Associated Probes pane, to delete a probe.

Redirect Virtual Server

When you select the Redirect Virtual Server tab specify a virtual server to receive traffic redirected by a server farm. When you map real servers to redirect virtual servers, it provides persistence for clients to real servers across TCP sessions.

The following information appears:

Column

Description

Name

The name of the redirect virtual server.

SSL Port

The SSL port number.

Status

Status of the redirect virtual server.

From this dialog, you can do the following:

•Click Add to add a new redirect virtual server. For more information, see "Adding a Redirect Virtual Server" section.

•Click Edit to edit the properties of the redirect virtual server. For more information, see "Editing Redirect Virtual Servers" section.

•Select a row and click Delete to delete a redirect virtual server.

Adding Multiple Real Servers

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Click Add to create a new server farm. The Add Server Farm dialog box appears.

Step 3 Click the Real Servers tab.

Step 4 Click Add and from the list select Add Multiple Real Servers. The Real Server Selector appears, displaying the following columns.

GUI Element

Action/Description

Available Named Real Server pane

Name field

Select the real server.

Selected Named Real Server pane

Name field

Name of the selected real server.

Port field

Port number of the real server.

Local SSL field

Indicates if this real server is the SSL daughter card.

This column is visible only if you launch the CVDM-CSM for a CSM-S service module. It will not be visible if you launch CVDM-CSM.

Weight field

Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.

From this dialog box, you can do the following:

•Select a real server from the Available Named Real Server pane and click Add to include it in the Selected named Real Server pane.

•Select a real server from the Selected named Real Server pane and click Remove, to remove the real server from the selected list.

•Click Clear All to remove all the real servers from the Selected named Real Server pane.

•Click Add New to add a new real server in the Selected named Real Server pane. For more information, see Adding a Real Server, page 6-9.

Editing Server Farms

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Select a sever farm and click Edit. The Edit Server Farm dialog box appears.

Step 3 Click one of the following tabs, then proceed to the corresponding section for configuration information:

• General

• Real Server

• Health Checkup

• Redirect Virtual Server

General

When you select the General tab the following information appears:

Column

Descriptions

Name

Enter the name of the server farm.

Predictor

Load-Balancing Algorithm

Specify the load-balancing algorithm for the server farm from the list. Based on the load balancing algorithm the traffic will be diverted to the respective real server. If not specified, the default is Round Robin.

It can be one of the following:

•Round Robin—Selects the next server in the list of real servers.

•Least Connections—Selects the server with the least number of connections.

•Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables.

•Hash URL—Selects the server using a hash value, based on the URL.

•Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.

Mask Type

It can be source, destination or both.

This field is enabled only for Hash Address algorithm type.

Mask

The mask of the real server in the server farm. This field is enabled only for Hash Address algorithm type.

NAT

Server NAT

Select the check box to enable Server NAT.

Client NAT

Select the check box to enable Client NAT.

Back-end SSL encryption

Select the check box to enable back-end SSL encryption.

This field will be enabled only when you select the Server NAT check box.

Pool

Enter the name of the client pool. You can modify this field only if client NAT is enabled in this server farm.

Click and select one of the following:

•Select Pool—Opens the Client NAT Pool Selector dialog box and allows you to select a client pool from the list.

•Create Pool—Opens the Add NAT Pool dialog box and allows you to create a client pool. For more information, see Adding NAT Pools.

•Clear Pool—Allows you to clear the field.

Real Server

When you select the Real Servers tab the following information appears:

Fields

Description

Real

Name of real servers configured in the server farm.

Local

Indicates if this real server is the SSL daughter card.

Min. Connections

The minimum number of connections for the real server.

Max. Connections

The maximum number of connections for the real server.

Weight

Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.

Admin Status

Lets you know if the status of the real server.

From this dialog box, you can do the following:

•Click Add and select one of the following:

–Select Named Real Server—Opens the Add Named Real Server dialog box. For more information, see "Adding a Named Real Server" section.

–Create Unnamed Real Server—Opens the Add Unnamed Real Server dialog box. For more information, see "Adding an Unnamed Real Server" section.

–Add Multiple Real Servers—Opens the Real Server Selector and allows you to add multiple real servers. For more information, see

•Select a real server and click Edit to edit its configurations. For more information, see "Editing a Real Server" section.

•Select a real server and click Delete to delete it.

Health Checkup

You can configure probes by specifying the probe name and type. After configuring a probe, you must associate it with a server farm for the probe to take effect. All servers in the server farm receive probes of the probe types that are associated with that server farm. You can associate one or more probe types with a server farm.

When you select the Health Checkup tab, the following information appears:

Field

Description

Fail Action

From the list, specify the behavior of the connection when the real server fails. It can be one of the following:

•None

•Purge

•Reassign

Return Code Map

Specify the return code map.

Click and select one of the following:

•Select Return Code Map—Opens the Return Code Map Selector dialog box. Allows you to select a return code map from the list.

•Create Return Code Map—Opens the Add Return Code Map dialog box to create a return code map. For more information, see Adding a Return Code Map, page 8-13.

•Clear Field—Allows you to clear the field.

Inband Health Checkup

Select the check box to enable inband health monitoring for all the servers in the server farm. You can set the retry attempts and the number of retries.

Number of Retries

Enter the number of consecutive connection attempts before considering the real server failed.

Retry Interval

Enter the retry interval (in seconds).

Associated Probes

Name

You can see the probes associated to the server farm.

From this dialog box, you can do the following:

•Click Add under the Associated Probes pane, to choose a probe from the list and associate it to the real server.

•Click Delete under the Associated Probes pane, to delete a probe.

Redirect Virtual Server

When you select the Redirect Virtual Server tab to specify a virtual server to receive traffic redirected by a server farm. A table appears with the following informations:

Field

Description

Name

The name of the redirect virtual server.

SSL Port

The SSL port number.

Status

Status of the redirect virtual server.

From this dialog box, you can do the following:

•Click Add to add a new redirect virtual server. For more information, see "Adding a Redirect Virtual Server" section.

•Click Edit to edit the properties of the redirect virtual server. For more information, see "Editing Redirect Virtual Servers" section.

•Select a row and click Delete to delete a redirect virtual server.

Viewing a Server Farm Node

You can see details of individual server farms. You can add redirect virtual servers and also set the administrative status of real servers in the server farm.

Figure 5-2 Server Farm Node Page

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Select a server farm from the object selector to view its details. The server farm table appears, displaying the following columns.

Field

Description

Predictor

Load-Balancing Algorithm

The load-balancing algorithm for the server farm. Based on the load balancing algorithm the traffic will be diverted to the respective real server. If not specified, the default is Round Robin.

It can be one of the following:

•Round Robin—Selects the next server in the list of real servers.

•Least Connections—Selects the server with the least number of connections.

•Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables.

•Hash URL—Selects the server using a hash value, based on the URL.

•Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.

Mask Type

It can be source, destination or both.

This field is enabled only for Hash Address algorithm type.

Mask

Enter the mask of the real server in the server farm. This field appears only for Hash Address algorithm type.

NAT

Server NAT

Lets you know if server NAT is enabled in this server farm.

Client NAT

Lets you know if client NAT is enabled in this server farm.

Back-end SSL encryption

Lets you know that back-end SSL encryption is enabled.

Pool

The name of the client pool. This field will appear only when client NAT is enabled in this server farm.

Real Servers

Real

The name of the real server.

Local

Indicates if this real server is the SSL daughter card.

Min. Connections

The minimum number of connections for the real server.

Max. Connections

The maximum connections for the real server.

Weight

Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.

Admin Status

The admin status of the real server with respect to this server farm.

Operational Status

The operational status of the real server with respect to this server farm.

Health Checkup

Fail Action

The course of action determined for the server farm in case of failure.

HTTP Return Code

The HTTP return code map for the server farm.

Inband Health Checkup

Number of Retries

The number of consecutive connection attempts before considering the real server failed.

Retry Interval

The retry interval (in seconds).

Associated Probes

The list of probes associated with the server farm.

From this dialog box, you can do the following:

•Select a real server and click Set Admin Status to instantly set its state.

•Click the Redirect Virtual Server button to view the redirect virtual servers associated with this real server. You can also add, edit, or delete a redirect virtual server. For more information, see:

– Adding a Redirect Virtual Server

– Editing Redirect Virtual Servers

•Click Edit to edit the server farm. For more information, see "Editing Server Farms" section.

Adding a Named Real Server

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Click Add. The Add Server Farm dialog box appears.

Step 3 Select the Real Server tab in this dialog box.

Step 4 Click Add, and choose Select Named Real Server from the options.

The Add Named Real Server dialog box appears, displaying the following columns.

Column

Description

Name

From the list, select the name of the named real server.

Real Server

Enter the name of the real server.

Click and select one of the following:

•Select Real Server—Opens the Named Real Server Selector dialog box and allows you to select a real server from the list.

•Create Real Server—Opens the Add Real Server dialog box and allows you to create a real server. For more information, see Adding a Real Server, page 6-9.

•Clear Real Server—Allows you to clear the field.

Port

Enter the port number.

Min. Connections

Enter the minimum number of connections for the real server.

Max. Connections

Enter the maximum number of connections for the real server.

Weight

Enter the weight assigned to the real server.

The weight identifies the capacity of the real server compared to other real servers in the server farm.

Redirect Virtual Server

Click and do one of the following:

•Select Redirect Virtual Server—Opens the Redirect Virtual Server Selector dialog box. It allows you to select a redirect virtual server from the list.

•Create Redirect Virtual Server—Opens the Add Redirect Virtual Server dialog box and allows you to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server.

•Clear Redirect Virtual Server—Allows you to clear the field.

Local SSL

Select the check box to indicate that the real server is the SSL daughter card.

Status

Specify the status of the real server.

Back Up Real Server

Name

Click and do one of the following:

•Select Named Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select a named backup real server from the list.

•Select Unnamed Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select an unnamed backup real server from the list.

•Clear Backup Real Server—Allows you to clear the field.

Port

Displays the port number of the backup real server.

Probe

Probe Name

Click and do one of the following:

•Select Probe—Opens the Probe Selector dialog box and allows you to select a probe from the list.

•Create Probe—Opens the Add Probe dialog box and allows you to create new probes. For more information, see "Adding Probes" section on page 10-4.

•Clear Probe—Allows you to clear the field.

Tag

Enter the tag for the probe.

Adding an Unnamed Real Server

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Click Add. The Add Server Farm dialog box appears.

Step 3 Select the Real Server tab in this dialog box.

Step 4 Click Add, and choose Create Unnamed Real Server from the options.

The Add Unnamed Real Server dialog box appears, displaying the following columns.

Column

Description

IP Address

Enter the IP address of the destination.

Port

Enter the port number.

Min. Connections

Enter the minimum number of connections for the real server.

Max. Connections

Enter the maximum number of connections for the real server.

Weight

Enter the weight assigned to the real server.

The weight identifies the capacity of the real server compared to other real servers in the server farm.

Redirect Virtual Server

Click and do one of the following:

•Select Redirect Virtual Server—Opens the Redirect Virtual Server Selector dialog box. It allows you to select a redirect virtual server from the list.

•Create Redirect Virtual Server—Opens the Add Redirect Virtual Server dialog box and allows you to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server.

•Clear Redirect Virtual Server—Allows you to clear the field.

Local SSL

Select the check box to indicate that the real server is the SSL daughter card.

Status

Specify the status of the real server.

Backup Real Server

Name

Click and do one of the following:

•Select Named Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select a named backup real server from the list.

•Select Unnamed Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select an unnamed backup real server from the list.

•Clear Backup Real Server—Allows you to clear the field.

Port

Displays the port number of the backup real server.

Probe

Probe Name

Click and do one of the following:

•Select Probe—Opens the Probe Selector dialog box and allows you to select a probe from the list.

•Create Probe—Opens the Add Probe dialog box and allows you to create new probes. For more information, see Adding Probes, page 10-4.

•Clear Probe—Allows you to clear the field.

Tag

Enter the tag for the probe.

Editing a Real Server

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Click the Add button provided at the end of the table.

The Add Server Farm dialog box appears.

Step 3 Select the Real Server tab in this dialog box.

Step 4 Select a real server and click Edit.

The Edit Real Server dialog box appears, displaying the following columns.

Field

Description

IP Address

(For unnamed real servers) Enter the IP address of the real server.

Port

Enter the port number.

Real Server

(For the named real server) IP address of the named real server.

Min. Connections

Enter the minimum number of connections for the real server.

Max. Connections

Enter the maximum number of connections for the real server.

Weight

Enter the weight assigned to the real server.

The weight identifies the capacity of the real server compared to other real servers in the server farm.

Redirect Virtual Server

Click and do one of the following:

•Select Redirect Virtual Server—Opens the Redirect Virtual Server Selector dialog box. It allows you to select a redirect virtual server from the list.

•Create Redirect Virtual Server—Opens the Add Redirect Virtual Server dialog box and allows you to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server.

•Clear Redirect Virtual Server—Allows you to clear the field.

Local SSL

Select the check box to indicate that the real server is the SSL daughter card.

Status

Specify the status of the real server.

Back Up Real Server

Name

Click and do one of the following:

•Select Named Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select a named backup real server from the list.

•Select Unnamed Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select an unnamed backup real server from the list.

•Clear Backup Real Server—Allows you to clear the field.

Port

Displays the port number of the backup real server.

Probe

Probe Name

Click and do one of the following:

•Select Probe—Opens the Probe Selector dialog box and allows you to select a probe from the list.

•Create Probe—Opens the Add Probe dialog box and allows you to create new probes. For more information, see Adding Probes, page 10-4.

•Clear Probe—Allows you to clear the field.

Tag

Enter the tag for the probe.

Redirect Virtual Servers

You can specify a virtual server to receive traffic redirected by a server farm. When you map real servers to redirect virtual servers, it provides persistence for clients to real servers across TCP sessions.

If the redirect virtual server does not have any real servers available, you need to specify a backup or relocation string sent in response to HTTP requests.

To see the details of the redirect virtual servers that you have configured for a server farm:

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Select a server farm from the object selector.

Step 3 Click the Redirect Virtual Server button. The Redirect Virtual Server dialog box appears, displaying the following columns:

Column

Description

Name

Name of the redirect virtual server.

SSL Port

SSL port number. The range is from 1 to 65535 or one of the following:

•HTTP

•WWW

•FTP

Status

Specify the status of the redirect virtual server.

From this dialog box, you can do the following:

•Click Add to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server.

•Select a redirect virtual server and click Edit to edit the configurations of the redirect virtual server. For more information, see Editing Redirect Virtual Servers.

Adding a Redirect Virtual Server

You can specify a virtual server to receive traffic redirected by a server farm. When you map real servers to redirect virtual servers, it provides persistence for clients to real servers across TCP sessions.

If the redirect virtual server does not have any real servers available, you need to specify a backup or relocation string sent in response to HTTP requests.

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Select the required server farm from the object selector.

Step 3 Click the Redirect Virtual Server button.

The Redirect Virtual Server dialog box appears.

Step 4 Click Add to add a new redirect virtual server.

The Add Redirect Virtual Server dialog box appears, displaying the following columns.

Column

Description

Name

Specify the name of the redirect virtual server.

SSL Port

SSL port number. The range is from 1 to 65535 or you can select one of the following from the list:

•HTTP

•WWW

•FTP

Status

Specify the status of the redirect virtual server.

Backup

Response

Specify the backup response. This is sent in response to redirected HTTP requests.

HTTP Status Code

Select the HTTP status code. It can be one of the following:

•301—Requested resource has been assigned a new permanent URL.

•302—Requested resource resides temporarily under a different URL.

The default status code is 302.

Relocation

Response

Specify the relocation response. This is sent in response to redirected HTTP requests.

HTTP Status Code

Select the HTTP status code.

Editing Redirect Virtual Servers

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farms in the Setup pane.

Step 2 Select the required server farm from the object selector.

Step 3 Click the Redirect Virtual Server button.

The Redirect Virtual Server dialog box appears.

Step 4 Select a redirect virtual server and click Edit to add a new redirect virtual server.

The Edit Redirect Virtual Server dialog box appears, displaying the following columns.

Column

Description

Name

Specify the name of the redirect virtual server.

SSL Port

SSL port number. The range is from 1 to 65535 or you can select one of the following from the list:

•HTTP

•WWW

•FTP

Status

Specify the status of the redirect virtual server.

Backup

Response

Specify the backup response. This is sent in response to redirected HTTP requests.

HTTP Status Code

Select the HTTP status code. It can be one of the following:

•301—Requested resource has been assigned a new permanent URL.

•302—Requested resource resides temporarily under a different URL.

The default status code is 302.

Relocation

Response

Specify the relocation response. This is sent in response to redirected HTTP requests.

HTTP Status Code

Select the HTTP status code.

NAT Pools

When you configure client Network Address Translation (NAT) pools, NAT converts the source IP address of the client requests into an IP address on the server-side VLAN. You can configure a NAT pool with a range of IP addresses. To configure an NAT pool with a single IP address, you can specify the same IP address for starting and ending IP address.

Related Topics:

• Viewing NAT Pools

• Adding NAT Pools

• Editing NAT Pools

Viewing NAT Pools

Figure 5-3 NAT Pools Window

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farm in the Setup pane.

Step 2 Select NAT Pools from the object selector.

The NAT Pools dialog box appears, displaying the following columns.

Column

Description

Name

Name of the NAT pool.

Start IP Address

The starting IP address of the range of addresses in the NAT pool. An NAT pool with a single IP address will have the same the IP address for the starting and the ending IP address.

End IP Address

The ending IP address of the range of addresses in the NAT Pool.

Mask

The mask IP of the for the associated IP subnet.

When you select a NAT pool from the table, you can see the corresponding details:

Column

Description

Details

Name

Name of the NAT pool.

Start IP Address

The starting IP address of the range of addresses in the NAT pool. An NAT pool with a single IP address will have the same the IP address for the starting and the ending IP address.

End IP Address

The ending IP address of the range of addresses in the NAT Pool.

Mask

The mask IP of the for the associated IP subnet.

Associated Server Farms

Name

Displays the name of the server farm that has this NAT pool is associated with.

From this section, you can do the following:

•Click Add to add NAT Pools. For more information, see Adding NAT Pools.

•Select a NAT pool and click Edit to edit it. For more information, see Editing NAT Pools.

•Select a node and click Delete to delete the NAT Pool.

Adding NAT Pools

Note To create a NAT pool with a single IP address, provide the same IP address in the Start IP Address and End IP Address fields.

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farm in the Setup pane.

Step 2 Select NAT Pools from the object selector.

Step 3 Click Add. The Add NAT Pool dialog box appears, displaying the following columns.

Column

Description

Name

Name of the NAT pool.

Start IP Address

The starting IP address of the range of addresses in the NAT pool. An NAT pool with a single IP address will have the same the IP address for the starting and the ending IP address.

End IP Address

The ending IP address of the range of addresses in the NAT Pool.

Mask

The mask IP of the for the associated IP subnet.

Editing NAT Pools

Step 1 Do one of the following:

•Click Home at the top of the window and click Server Farms under Services Dashboard.

Or:

•Click Setup from the task bar and click Server Farm in the Setup pane.

Step 2 Select NAT Pools from the object selector.

Step 3 Click Edit. The Edit NAT Pool dialog box appears, displaying the following columns.

Column

Description

Name

Name of the NAT pool.

Start IP Address

The starting IP address of the range of addresses in the NAT pool. An NAT pool with a single IP address will have the same the IP address for the starting and the ending IP address.

End IP Address

The ending IP address of the range of addresses in the NAT Pool.

Mask

The mask IP of the for the associated IP subnet.

Column	Description
Name	Name of the server farm.
Predictor	Type of load-balancing algorithm used by the server farm. If not specified, the default is Round Robin. It can be one of the following: •Round Robin—Selects the next server in the list of real servers. •Least Connections—Selects the server with the least number of connections. •Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables. •Hash URL—Selects the server using a hash value, based on the URL. •Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.
NAT	Shows whether server and client Network Address Translation (NAT) is enabled.
Reals	Number of real servers configured in the server farm.
Redirects	Shows the number of redirect virtual servers configured in the server farm.
Return Code Map	Specifies the return code map associated with the server farm.

Column	Descriptions
Name	Enter the name of the server farm.
Predictor
Load-Balancing Algorithm	Specify the load-balancing algorithm for the server farm from the list. Based on the load balancing algorithm the traffic will be diverted to the respective real server. If not specified, the default is Round Robin. It can be one of the following: •Round Robin—Selects the next server in the list of real servers. •Least Connections—Selects the server with the least number of connections. •Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables. •Hash URL—Selects the server using a hash value, based on the URL. •Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.
Mask Type	It can be source, destination, or both. This field is enabled only for Hash Address algorithm type.
Mask	The mask of the real server in the server farm. This field is enabled only for Hash Address algorithm type.
NAT
Server NAT	Select the check box to enable Server NAT.
Client NAT	Select the check box to enable Client NAT.
Back-End SSL encryption	Select the check box to enable backend SSL encryption. This field will be enabled only when you select the Server NAT check box.
Pool	Enter the name of the client pool. You can modify this field only if client NAT is enabled in this server farm. Click and select one of the following: •Select Pool—Opens the Client NAT Pool Selector dialog box and allows you to select a client pool from the list. •Create Pool—Opens the Add NAT Pool dialog box and allows you to create a client pool. For more information, see Adding NAT Pools. •Clear Pool—Allows you to clear the field.

Column	Description
Real	Name of real servers configured in the server farm.
Local	Indicates if this real server is the SSL daughter card.
Min. Connections	The minimum number of connections for the real server.
Max. Connections	The maximum number of connections for the real server.
Weight	Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.
Admin Status	Lets you know if the status of the real server.

Column	Description
Fail Action	From the list, specify the behavior of the connection when the real server fails. It can be one of the following: •None •Purge •Reassign
Return Code Map	Specify the return code map. Click and select one of the following: •Select Return Code Map—Opens the Return Code Map Selector dialog box. Allows you to select a return code map from the list. •Create Return Code Map—Opens the Add Return Code Map dialog box to create a return code map. For more information, see Adding a Return Code Map, page 8-13. •Clear Return Code Map to clear the field.
Inband Health Checkup	Select the check box to enable inband health monitoring for all the servers in the server farm. You can set the retry attempts and the number of retries.
Number of Retries	Enter the number of consecutive connection attempts before considering the real server failed.
Retry Interval	Enter the retry interval in seconds.
Associated Probes
Name	You can see the probes associated to the server farm.

Column	Description
Name	The name of the redirect virtual server.
SSL Port	The SSL port number.
Status	Status of the redirect virtual server.

GUI Element	Action/Description
Available Named Real Server pane
Name field	Select the real server.
Selected Named Real Server pane
Name field	Name of the selected real server.
Port field	Port number of the real server.
Local SSL field	Indicates if this real server is the SSL daughter card. This column is visible only if you launch the CVDM-CSM for a CSM-S service module. It will not be visible if you launch CVDM-CSM.
Weight field	Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.

Field	Description
Predictor
Load-Balancing Algorithm	The load-balancing algorithm for the server farm. Based on the load balancing algorithm the traffic will be diverted to the respective real server. If not specified, the default is Round Robin. It can be one of the following: •Round Robin—Selects the next server in the list of real servers. •Least Connections—Selects the server with the least number of connections. •Forward—Allows the CVDM-CSM to forward traffic according with its internal routing tables. •Hash URL—Selects the server using a hash value, based on the URL. •Hash Address—Selects the server using a hash value, based on the source and destination IP addresses.
Mask Type	It can be source, destination or both. This field is enabled only for Hash Address algorithm type.
Mask	Enter the mask of the real server in the server farm. This field appears only for Hash Address algorithm type.
NAT
Server NAT	Lets you know if server NAT is enabled in this server farm.
Client NAT	Lets you know if client NAT is enabled in this server farm.
Back-end SSL encryption	Lets you know that back-end SSL encryption is enabled.
Pool	The name of the client pool. This field will appear only when client NAT is enabled in this server farm.
Real Servers
Real	The name of the real server.
Local	Indicates if this real server is the SSL daughter card.
Min. Connections	The minimum number of connections for the real server.
Max. Connections	The maximum connections for the real server.
Weight	Weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.
Admin Status	The admin status of the real server with respect to this server farm.
Operational Status	The operational status of the real server with respect to this server farm.
Health Checkup
Fail Action	The course of action determined for the server farm in case of failure.
HTTP Return Code	The HTTP return code map for the server farm.
Inband Health Checkup
Number of Retries	The number of consecutive connection attempts before considering the real server failed.
Retry Interval	The retry interval (in seconds).
Associated Probes	The list of probes associated with the server farm.

Column	Description
Name	From the list, select the name of the named real server.
Real Server	Enter the name of the real server. Click and select one of the following: •Select Real Server—Opens the Named Real Server Selector dialog box and allows you to select a real server from the list. •Create Real Server—Opens the Add Real Server dialog box and allows you to create a real server. For more information, see Adding a Real Server, page 6-9. •Clear Real Server—Allows you to clear the field.
Port	Enter the port number.
Min. Connections	Enter the minimum number of connections for the real server.
Max. Connections	Enter the maximum number of connections for the real server.
Weight	Enter the weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.
Redirect Virtual Server	Click and do one of the following: •Select Redirect Virtual Server—Opens the Redirect Virtual Server Selector dialog box. It allows you to select a redirect virtual server from the list. •Create Redirect Virtual Server—Opens the Add Redirect Virtual Server dialog box and allows you to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server. •Clear Redirect Virtual Server—Allows you to clear the field.
Local SSL	Select the check box to indicate that the real server is the SSL daughter card.
Status	Specify the status of the real server.
Back Up Real Server
Name	Click and do one of the following: •Select Named Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select a named backup real server from the list. •Select Unnamed Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select an unnamed backup real server from the list. •Clear Backup Real Server—Allows you to clear the field.
Port	Displays the port number of the backup real server.
Probe
Probe Name	Click and do one of the following: •Select Probe—Opens the Probe Selector dialog box and allows you to select a probe from the list. •Create Probe—Opens the Add Probe dialog box and allows you to create new probes. For more information, see "Adding Probes" section on page 10-4. •Clear Probe—Allows you to clear the field.
Tag	Enter the tag for the probe.

Column	Description
IP Address	Enter the IP address of the destination.
Port	Enter the port number.
Min. Connections	Enter the minimum number of connections for the real server.
Max. Connections	Enter the maximum number of connections for the real server.
Weight	Enter the weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.
Redirect Virtual Server	Click and do one of the following: •Select Redirect Virtual Server—Opens the Redirect Virtual Server Selector dialog box. It allows you to select a redirect virtual server from the list. •Create Redirect Virtual Server—Opens the Add Redirect Virtual Server dialog box and allows you to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server. •Clear Redirect Virtual Server—Allows you to clear the field.
Local SSL	Select the check box to indicate that the real server is the SSL daughter card.
Status	Specify the status of the real server.
Backup Real Server
Name	Click and do one of the following: •Select Named Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select a named backup real server from the list. •Select Unnamed Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select an unnamed backup real server from the list. •Clear Backup Real Server—Allows you to clear the field.
Port	Displays the port number of the backup real server.
Probe
Probe Name	Click and do one of the following: •Select Probe—Opens the Probe Selector dialog box and allows you to select a probe from the list. •Create Probe—Opens the Add Probe dialog box and allows you to create new probes. For more information, see Adding Probes, page 10-4. •Clear Probe—Allows you to clear the field.
Tag	Enter the tag for the probe.

Field	Description
IP Address	(For unnamed real servers) Enter the IP address of the real server.
Port	Enter the port number.
Real Server	(For the named real server) IP address of the named real server.
Min. Connections	Enter the minimum number of connections for the real server.
Max. Connections	Enter the maximum number of connections for the real server.
Weight	Enter the weight assigned to the real server. The weight identifies the capacity of the real server compared to other real servers in the server farm.
Redirect Virtual Server	Click and do one of the following: •Select Redirect Virtual Server—Opens the Redirect Virtual Server Selector dialog box. It allows you to select a redirect virtual server from the list. •Create Redirect Virtual Server—Opens the Add Redirect Virtual Server dialog box and allows you to add a redirect virtual server. For more information, see Adding a Redirect Virtual Server. •Clear Redirect Virtual Server—Allows you to clear the field.
Local SSL	Select the check box to indicate that the real server is the SSL daughter card.
Status	Specify the status of the real server.
Back Up Real Server
Name	Click and do one of the following: •Select Named Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select a named backup real server from the list. •Select Unnamed Backup Real Server—Opens the Backup Real Server Selector dialog box and allows you to select an unnamed backup real server from the list. •Clear Backup Real Server—Allows you to clear the field.
Port	Displays the port number of the backup real server.
Probe
Probe Name	Click and do one of the following: •Select Probe—Opens the Probe Selector dialog box and allows you to select a probe from the list. •Create Probe—Opens the Add Probe dialog box and allows you to create new probes. For more information, see Adding Probes, page 10-4. •Clear Probe—Allows you to clear the field.
Tag	Enter the tag for the probe.

Column	Description
Name	Name of the redirect virtual server.
SSL Port	SSL port number. The range is from 1 to 65535 or one of the following: •HTTP •WWW •FTP
Status	Specify the status of the redirect virtual server.

Column	Description
Name	Specify the name of the redirect virtual server.
SSL Port	SSL port number. The range is from 1 to 65535 or you can select one of the following from the list: •HTTP •WWW •FTP
Status	Specify the status of the redirect virtual server.
Backup
Response	Specify the backup response. This is sent in response to redirected HTTP requests.
HTTP Status Code	Select the HTTP status code. It can be one of the following: •301—Requested resource has been assigned a new permanent URL. •302—Requested resource resides temporarily under a different URL. The default status code is 302.
Relocation
Response	Specify the relocation response. This is sent in response to redirected HTTP requests.
HTTP Status Code	Select the HTTP status code.

Column	Description
Name	Name of the NAT pool.
Start IP Address	The starting IP address of the range of addresses in the NAT pool. An NAT pool with a single IP address will have the same the IP address for the starting and the ending IP address.
End IP Address	The ending IP address of the range of addresses in the NAT Pool.
Mask	The mask IP of the for the associated IP subnet.

Column	Description
Details
Name	Name of the NAT pool.
Start IP Address	The starting IP address of the range of addresses in the NAT pool. An NAT pool with a single IP address will have the same the IP address for the starting and the ending IP address.
End IP Address	The ending IP address of the range of addresses in the NAT Pool.
Mask	The mask IP of the for the associated IP subnet.
Associated Server Farms
Name	Displays the name of the server farm that has this NAT pool is associated with.