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nstrtel(5)

Tunable Kernel Parameters
HP-UX 11i Version 3: February 2007
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NAME

nstrtel — specifies the number of telnet device files the kernel can support for incoming telnet sessions

VALUES

Failsafe

60

Default

60

Allowed values

Any positive integer. (Subject to available physical memory.)

It is best to use the default value, and there should not be any need to lower it. However, if the simultaneous telnet connection load is very high, then the value of nstrtel could be increased.

Recommended values

60 (Default value.)

DESCRIPTION

The telnet daemon uses two STREAMS-based pseudo-terminal drivers (telm and tels). The kernel parameter, nstrtel, can be used to tune the number of pseudo-terminals. nstrtel specifies the number of kernel data structures that are created at system boot time that are required to support the device files used by incoming telnet sessions on a server. If the insf command or SAM is used to create more telnet device files, the value of nstrtel must be increased accordingly or the device files cannot be used because there are no kernel data structures available for communicating with the system.

Who Is Expected to Change This Tunable?

Anyone.

Restrictions on Changing

Changes to this tunable take effect at the next reboot.

When Should the Value of This Tunable Be Raised?

When there is an increase in the load of telnet connections and there are no device files available to open telnet connections, then this kernel parameter should be increased.

When the telnetd: Telnet device drivers missing: No such device, error is encountered, then the device files have been exhausted and nstrtel should be raised. Once the value of nstrtel is raised, insf should be run to create new device files. (If SAM is used to raise the value of nstrtel, insf is run automatically.)

What Are the Side Effects of Raising the Value of This Tunable?

More resources would be consumed. Extra kernel data structures, and extra device files may clog the system.

When Should the Value of This Tunable Be Lowered?

It is not advisable to lower the tunable value from the default value. Consult HP Support before lowering this tunable from the default value.

What Are the Side Effects of Lowering the Value of This Tunable?

Though not recommended, there would not be any side effects.

What Other Tunables Should Be Changed at the Same Time?

None.

WARNINGS

All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX.

Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tunable values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see HP-UX Release Notes at http://docs.hp.com.

AUTHOR

nstrtel was developed by HP.

SEE ALSO

insf(1M), telnetd(1M), telm(7), tels(7).

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