topic Re: TCP_finwait2 in Operating System - HP-UX

TCP_finwait2

HP UX 11i — Wed, 01 Mar 2006 05:30:23 GMT

Bonjour
Nous avons une paramètre system qui dure plus de 15 minute pour que le system libère les socle (pour Aix la paramètre est Fin wait ou close wait ),c’est une paramètre du noyau du system HpUx. Nous voulons réduire cette valeur par défaut pour avoir 2 ou 4 seconds au maximum.

Re: TCP_finwait2

Colin Topliss — Wed, 01 Mar 2006 06:14:35 GMT

Bonjour.

If I've read your French correctly.....

ndd -set /dev/tcp tcp_fin_wait_2_timeout 600000

where 600000 is time in milliseconds.

Look in /etc/rc.config.d/nddconf

Regards

Colin.

Re: TCP_finwait2

Senthil Kumar .A_1 — Wed, 01 Mar 2006 06:30:42 GMT

Hi , there seems to be a duplicate query.

procedure should be..

ndd -set /dev/tcp tcp_time_wait_interval 60000

To make the change permanent:
Modify /etc/rc.config.d/ndd.conf by adding the following line:
TRANSPORT_NAME[0]=tcp
NDD_NAME[0]=tcp_time_wait_interval
NDD_VALUE[0]=60000

make sure .. the 0 in [0] is repalced by the last number that follows the existing sequence.

60000 millisec = 1 minute.

regards,
Senthil Kumar .A

Re: TCP_finwait2

rick jones — Wed, 01 Mar 2006 20:50:04 GMT

And unless applications are calling shutdown() and then waiting for the remote FIN before calling close, and perhaps even then if they properly have a timeout on that wait, on HP-UX 11, the tcp_keepalive_detached_interval should kick-in and that keepalive mechanism "should" cull the miscreant remotes that are using an abortive close.

now, if there is a broken firewall (somehow it seems redundant to say broken firewall) there may still be a need for the FIN_WAIT_2 timeout but generally it shouldn't