Telnet logout after connection lost

[David Norman]

Can someone please let me know what the setting is that controls how long telnet waits before logging out after the connection is lost (today someone power-cycled the router!). Our system (10.20) seems to be set for 2 hours - I would like to make this somewhat shorter. Users would be running an application (UniVerse) and would not be at the shell prompt.
Thanks.

[Steven Sim Kok Leong · Accepted solution]

Hi,

Use nettune to configure your network tunable parameters to drop connections faster than the default 2 hours.

*Parameter wait time before probing the connection: tcp_keepstart
*Parameter interval between probes: tcp_keepfreq
*Parameter maximum time or tries to probe connection before dropping: tcp_keepstop
*Unit of measure: seconds

To set your tcp_keepstop from the default 2 hours (7200) to say 30 mins (1800), run

# nettune -s tcp_keepstop 1800

Hope this helps. Regards.

Steven Sim Kok Leong

[David Norman]

Thanks, Steven.

It is actually tcp_keepstart that is set for 2 hours - tcp_keepstop is set for 10 minutes. I will change keepstart to around 30 minutes.

Thanks again for pointing me in the right direction.

Regards,
David Norman.