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000-221 · Question #87

An administrator uses the 'no1 command to change the tcp_sendspace network tunable to 262144. A few minutes later, the ifconfig command produces the following output: What additional action is needed?

The correct answer is C. Change the tcp_sendspace interface specific network option for the device. The global tcp_sendspace tunable changed by 'no' does not override per-interface settings; the interface-specific attribute must be updated separately.

Performance Monitoring and Tuning

Question

An administrator uses the 'no1 command to change the tcp_sendspace network tunable to 262144. A few minutes later, the ifconfig command produces the following output: What additional action is needed?

Options

  • AUse ifconfig to cycle the interface down and up.
  • BRun the no command again, specifying a permanent change.
  • CChange the tcp_sendspace interface specific network option for the device.
  • DRefresh inetd subsystem.

How the community answered

(26 responses)
  • A
    4% (1)
  • B
    4% (1)
  • C
    77% (20)
  • D
    15% (4)

Why each option

The global tcp_sendspace tunable changed by 'no' does not override per-interface settings; the interface-specific attribute must be updated separately.

AUse ifconfig to cycle the interface down and up.

Cycling the interface down and up with ifconfig only reinitializes the interface using its currently stored parameters and does not alter the tcp_sendspace attribute value.

BRun the no command again, specifying a permanent change.

Running 'no' again with the permanent (-p) flag would persist the global tunable across reboots but still would not override the interface-specific sendspace attribute visible in the ifconfig output.

CChange the tcp_sendspace interface specific network option for the device.Correct

In AIX, each network interface stores its own tcp_sendspace attribute that takes precedence over the global value set by the 'no' command. The ifconfig output in this scenario reveals the interface-specific sendspace is still at the old value, so the administrator must update that per-device attribute using chdev or ifconfig with the appropriate attribute flag to align the interface with the new global setting.

DRefresh inetd subsystem.

Refreshing the inetd subsystem restarts inetd-managed network services and has no relationship to network interface tunables or the tcp_sendspace attribute.

Concept tested: AIX interface-specific tunable override after no command

Source: https://www.ibm.com/docs/en/aix/7.3?topic=n-no-command

Topics

#network tuning#tcp_sendspace#no command#interface-specific options

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