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HP Integrity Virtual Machines Version 4.0 Release Notes > Chapter 7 Networking Information

Guest and Host Communication


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Checksum offloading (CKO) is not supported. On most of the physical interfaces that are not of 10 Gigabyte type, CKO is turned off by default. Consult your interface card documentation for details.

Turning on CKO can cause host-to-guest connections as well as guest-to-host communication over a VLAN to fail. If you are receiving failures with host-to-guest connections or guest-to-host communication using a VLAN, ensure that the CKO is turned off in the host interface driver. If that does not fix the problem, reboot the vswitch.

To turn off the CKO on the VM Host, identify the PPA of the network interface for the vswitch using the hpvmnet command. For example:

# hpvmnet Name Number State Mode PPA MAC Address IP Address ======== ====== ======= ========= ====== ============== =============== localnet 21 Up Shared N/A N/A vmlan0 22 Up Shared lan0 0x00306ea72c0d vmlan4 23 Up Shared lan4 0x00127942fce3 vmlan900 24 Up Shared lan900 0x00306e39815a

Check the status of the transmit CKO using the following command:

# lanadmin -x cko 4 Hardware TCP/UDP (IPv4) transmit checksum offload is currently enabled. Hardware TCP/UDP (IPv4) receive checksum offload is currently disabled.

In this example, the VLANs are configured over the vswitch vmlan4. This vswitch is created on PPA 4 on the VM Host. To turn off CKO on PPA 4, enter the following command on the VM Host:

# lanadmin send_cko_off 4 Hardware TCP/UDP (IPv4) transmit checksum offload is currently disabled.
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