topic Re: tcp_keepalive_interval in Operating System - HP-UX

tcp_keepalive_interval

Ed Hon — Tue, 22 Aug 2000 13:06:32 GMT

What is the purpose of the tcp_keepalive_interval? Is the default of 2 hours "too long".

Re: tcp_keepalive_interval

Cheryl Griffin — Tue, 22 Aug 2000 13:09:31 GMT

The parameter tcp_keepalive_interval determines the amount of time that TCP
waits for an idle connection with no unacknowledged data before sending
keepalive packets. The default is 2 hours.

Re: tcp_keepalive_interval

Alex Glennie — Tue, 22 Aug 2000 13:10:35 GMT

The parameter tcp_keepalive_interval determines the amount of time that TCP
waits for an idle connection with no unacknowledged data before sending
keepalive packets. The default is 2 hours.

Re: tcp_keepalive_interval

John Palmer — Tue, 22 Aug 2000 13:13:17 GMT

Ed,

If you are on 11.00 do:-

ndd -h tcp_keepalive_interval

The default of 2 hours may be too long depending on your circumstances. Do you have lots of network connections that get lost (clients crashing and the like)?

If you reduce the interval then you may cause a slight increase in network traffic.

Re: tcp_keepalive_interval

Stefan Farrelly — Tue, 22 Aug 2000 13:14:34 GMT

Yes, 2 hours is too long to keep alive idle TCP connections. Weve set ours down to a much more reasonable 15 minutes, but you should only do so if your suffering from lots of open TCP sockets waiting to finish - ie. do a netstat -a|grep tcp|grep FIN

Re: tcp_keepalive_interval

Cheryl Griffin — Tue, 22 Aug 2000 13:14:57 GMT

Ed,

The two hour time limit should be fine. The connected machines, will stay connected and you won't know the difference. Then after the two hours, your machine will start polling the other to see if it is still there. Say the other machine crashes, no ACK will be sent back and the systems will disconnect. Otherwise it will just keep polling and wait for the response.

Re: tcp_keepalive_interval

CHRIS_ANORUO — Tue, 22 Aug 2000 13:16:42 GMT

Check these links for previous threads http://my1.itrc.hp.com/cm/QuestionAnswer/1,1150,0x8b4b49c5ae73d4118fef0090279cd0f9,00.html

http://my1.itrc.hp.com/cm/QuestionAnswer/1,1150,0x28a683667c40d4118feb0090279cd0f9,00.html