topic Re: PMTU Size Adjustment in Operating System - HP-UX

PMTU Size Adjustment

KPS — Tue, 04 Dec 2007 04:13:16 GMT

Hi,

I have a requirement that we're trying to fulfill which is to raise the PMTU value from 1500 to 9000 on my HP-UX 11.23 System. We thought that we had done this by adjusting the necessary values in /etc/rc.config.d/hpigelanconf. We rebooted and we're realizing the settings did not take place. Attached is a sample of our hpigelanconf file. Could anyone have any other recommendations on what we may be missing here?

Thanks in advance,

KPS

Re: PMTU Size Adjustment

Steven E. Protter — Tue, 04 Dec 2007 06:47:13 GMT

Shalom,

This is a network parameter manipulated by the ndd command.

Permanent changes are made in /etc/rc.config.d/nddconf

This is a rather radical change and I don't know if it will be permitted.

The man page provides the details on what you can do and not do.

ndd -get network_device parameter

ndd -set network_device parameter value

ndd -h sup[ported]

ndd -h unsup[ported]

ndd -h [parameter]

ndd -c
SEP

Re: PMTU Size Adjustment

yulianto piyut — Thu, 06 Dec 2007 09:38:52 GMT

KPS,

be carefull to change MTU size on your ethernet . you must check to your catalyst that you used, it must configured before. to make your permanent changes, check the type of your ethernet (ioscan -nfkClan), igelan or iether? if your ethernet is igelan, you must change the value in /etc/rc.config.d/hpigelanconf.

hopes can help!

-yut-

Re: PMTU Size Adjustment

Ivan Krastev — Thu, 06 Dec 2007 10:27:41 GMT

See paragraph 3 from this document for changing MTU size - http://www.docs.hp.com/en/J5683-90017/ch02s04.html

and allowed values - http://www.docs.hp.com/en/J5683-90017/ch03s01.html#babeiagg

regards,
ivan