topic Re: Connection Keep Alive in Operating System - HP-UX

Connection Keep Alive

Matt Slane — Thu, 31 May 2001 14:49:42 GMT

Are there any alternatives to find out the Connection Keep Alive time other than the nettune command. Currently I do not have the netman driver loaded and I can't reboot to add this driver, since this is on a production server. Any help would be appreciated...

Thanks,
Matt Slane

Re: Connection Keep Alive

Matt Slane — Thu, 31 May 2001 15:13:37 GMT

To be exact this is what I am looking for:

tcp_keepstop:
The number of seconds keep-alive packets will be sent on a TCP connection without the receipt of a packet after which the connection will be dropped.

Thanks,
Matt Slane

Re: Connection Keep Alive

Vincenzo Restuccia — Thu, 31 May 2001 15:49:39 GMT

from HP-UX 10.X onwards you can use the nettune command:

#nettune -s tcp_keepstart 300 # set it to 300 secs; default is 7200

Just do a man nettune to get all info.

excerpt:
tcp_keepstart:
The number of seconds that a TCP connection can be idle
(that is, no packets received) before keep-alive packets
will be sent attempting to solicit a response. When a packet
is received, keep-alive packets are not longer sent unless
the connection is idle again for this period of time.
tcp_keepfreq:
The interval in seconds at which keep-alive packets will
be sent on a TCP connection once they have been started.
The receipt of a packet will stop the sending of keep-alive
packets.
If both tcp_keepfreq and tcp_keepstop are being increased,
then tcp_keepstop should be increased first. If both are being
decreased, then tcp_keepfreq should be decreased first.
tcp_keepstop:
The number of seconds keep-alive packets will be sent on a
TCP connection without the receipt of a packet after which
the connection will be dropped.
If both tcp_keepfreq and tcp_keepstop are being increased,
then tcp_keepstop should be increased first. If both are being
decreased, then tcp_keepfreq should be decreased first.

Re: Connection Keep Alive

Matt Slane — Thu, 31 May 2001 15:55:31 GMT

This is the problem, I cannot run the nettune command without the netman driver loaded. I've man'd the nettune command to quite a bit. I have done further investigation and have resolved that HPUX 11 uses ndd instead of nettune (is this correct info?). In that case I need to find out what the default idle tcp connection drop is, since there is no entry in /etc/rc.config.d/nddconf for this type of thing. Thanks for the help anyways...

Matt Slane

Re: Connection Keep Alive

Vincenzo Restuccia — Thu, 31 May 2001 16:01:46 GMT

For equivalent to nettune -s tcp_receive and tcp_send in ndd see http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0x0870dfe5920fd5118fef0090279cd0f9,00.html

Re: Connection Keep Alive

Juan González — Thu, 31 May 2001 16:21:48 GMT

Hi Matt,
are you sure that you don't have netman loaded? Did you check it with lsdev?
If you see it with lsdev perhaps creating /dev/netman will be enougth.

#mknod /dev/netman c 0x000000

I tried to find tcp_keepstop symbol in the kernel with adb but it didn't work.

Good luck

JGM

Re: Connection Keep Alive

Matt Slane — Thu, 31 May 2001 16:27:21 GMT

Yep, checked that already, I didn't know about the lsdev command, I just did a cat on /stand/system. Thanks for the tip....

Matt

Re: Connection Keep Alive

Juan González — Fri, 01 Jun 2001 05:50:14 GMT

Hi Matt,
I think that your server's Connection Keep Alive time migth be the default value, i. e. , 600 minutes. If your server doesn't have the netman loaded, tcp_keepstop couldn't be changed.

Best regards,
Juan Gonzalez

Re: Connection Keep Alive

Juan González — Fri, 01 Jun 2001 06:49:18 GMT

Sorry 600 seconds, no minutes.

JGM