what should be done after nettune

[lei]

A little help needed, folks.
I got a long list of routing table on a 10.20 box, their flags are shown as UGHD.
I set the pmtu to 0 by command nettune -s tcp_pmtu 0
However when I ping any host, it still come out with a UGHD entry in the routing table.
May I have to do /sbin/init.d/net stop; /sbin/init.d/net start after I run the nettune?

Any idea is welcomed.
Thanks & have a good day
Lei

[harry d brown jr]

Lei,

Please read this thread, it clearly explains your issue and how to correct it.

live free or die
harry

[Jeff Schussele]

Link Harry?

Oops he said,
Jeff

[harry d brown jr]

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xe25f37f45ef7d4118fef0090279cd0f9,00.html

Thanks Jeff, I guess I popped my last brain cell lifting an N-class into a cabinet today. 240 pounds! Thank god it wasn't heavy!


live free or die
harry

[lei]

Hi folks,

I read this before, so I tried these things Berlene mentioned.
Am I missing some important points? I flushed the routing table, checked netconf file and disable the PMTU Discovery process; but the UGHD routes come out again.
Any help?

Thanks & have a good day
Lei

[harry d brown jr]

From the link Berlene said this:

You can turn this off at the router, run a cron job to flush the routing tables or turn off defrag with nettune.

live free or die
harry

[lei]

Hi Harry,

I am not going to corrected the routers because many routers are involved.
I can do the flush periodically, however what Berlene said was "... or turn off defrag with nettune."
So I think turn off the defrag should correct the problem. What I am also asking is how can I make sure nettune works? Any further steps?
Correct me if I am wrong.

Thank you for your time
lei

[lei]

After testing, I found out that it was the router as the default gateway, caused the HP-UX server to add a dynamic route entry into local routing table.

The solution could be disabling ICMP redirect on the default gateway.

Thanks to everyone who made their input to this message.

have a good day
lei