topic Re: MTU Setting in Operating System - HP-UX

MTU Setting

Joseph C. Denman — Mon, 04 Feb 2002 22:03:49 GMT

Need a little help folks.

OS 10.20
lanadmin -M 1006 #works fine.
Now, how do I make it remain after a reboot?

Do I need make a new startup script, or is there an entry I can add to hpetherconf, hpbase100conf or netconf to maintain this setting?

...jcd...

Re: MTU Setting

James R. Ferguson — Mon, 04 Feb 2002 22:15:06 GMT

Hi Joseph:

You shoule be able to do this in your /etc/rc.config.d/netconf file.

The ROUTE_ARGS arguments can include '-p pmtu' where the 'pmtu'. See the comments in the netconf file.

Regards!

...JRF...

Re: MTU Setting

Uday_S_Ankolekar — Mon, 04 Feb 2002 22:17:58 GMT

Hi,

I think you need to create a script to change it forever.

This Thread might help

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=55c3a9f21536027f3f/screen=ckiDisplayDocument?docId=200000051478772
-USA..

Re: MTU Setting

Joseph C. Denman — Wed, 06 Feb 2002 20:05:53 GMT

Thanks guys. I'll try James first, if no go, will go with the other.

Another thing?????

After changing the MTU setting, I put a sniffer on the network. This system is still sending out with a MTU of 1500. Is there something else I need to change?

...jcd...

Re: MTU Setting

Sanjay_6 — Wed, 06 Feb 2002 20:18:54 GMT

Hi,

you can edit the netconf file in /etc/rc.config.d to make the change permanent. the option should be added to ROUTE_ARGS as,

ROUTE_ARGS[0]="-p 1006"

To do it on the fly,

# lanadmin -M 1006 2
(2 above is the PPA number of the LAN interface)
# ifconfig lan2 down
# ifconfig lan2 up

Hope this helps.

regds

Re: MTU Setting

Ron Kinner — Wed, 06 Feb 2002 20:19:06 GMT

Just wondering if you have more than one NIC. If you do you might want to check with LANADMIN to make sure that you changed the one you thought you did. On our 10.20 machines the first card was NMID 4 and the other two were 5 and 6.

Just out of curiosity why exactly 1006?

Ron

Re: MTU Setting

Joseph C. Denman — Wed, 06 Feb 2002 21:29:27 GMT

Got it. Had to run "net stop/start"

Thanks for the help/ideas.

Ron,

We are running through a vpn that is adding to the packets, and we are attemping to cut down on the fragmentation.

...jcd...