topic Re: Recycle a Socket in Operating System - HP-UX

Recycle a Socket

Simpson — Mon, 25 Feb 2008 16:57:20 GMT

Is there anyway to restart/recycle a single socket connection? i know it will eventually time out but i have been asked to provide a solution to a socket that is stuck without a reboot.

Thanks

Re: Recycle a Socket

Laurent Menase — Mon, 25 Feb 2008 17:11:37 GMT

Hi
What is the state of your socket?

check with netstat -an or ndd -get /dev/tcp tcp_status

else you have a ndd tcp_discon_by_addr

Else we have a lot of different timeouts.
the most usefull is usually keepalive. you configure SO_KEEPALIVE on your socket, then it will send a probe to the peer. In case of no response after the usual timeout( tcp_ip_abort_interval ndd param) your connection is reset.
By default keepalive interval is 2hours, which is very long, you can lower it with ndd parameter tcp_keepalive_interval.

You must then configure tcp_keepalive_interval and tcp_ip_abort_interval to values which matches with your requirements.

If you lower tcp_ip_abort_interval, you need also to be sure tcp_notify_interval stay tcp_ip_abort_interval.

Re: Recycle a Socket

Simpson — Fri, 29 Feb 2008 19:29:35 GMT

Thanks, I was able to accomplish what I needed by temporarily lowering the keepalive to ensure any ports atht needed clearing/recycling happened. thanks