netdev
[Top] [All Lists]

Re: PMTU info

To: Andi Kleen <ak@xxxxxxx>
Subject: Re: PMTU info
From: Michael Richardson <mcr@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 08 Feb 2002 15:59:37 -0500
Cc: netdev@xxxxxxxxxxx
In-reply-to: Your message of "Fri, 08 Feb 2002 02:12:33 +0100." <20020208021233.A27027@xxxxxxxxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
-----BEGIN PGP SIGNED MESSAGE-----


>>>>> "Andi" == Andi Kleen <ak@xxxxxxx> writes:
    Andi> On Thu, Feb 07, 2002 at 05:59:45PM -0500, Michael Richardson wrote:
    >> We think that /proc/net/rt_cache might have info, but we don't
    >> see it. Is there another place that we should look?

    Andi> /proc/net/rt_cache has a MTU column. You can also get it via 
    Andi> ip route get <ip address> 

    Andi> route --cache unfortunately doesn't show it. 

  Do they expire very quickly? Can we extend it? Is there some debugging we
can enable to log the MTU changes? Does it get deleted when the TCP
connection gets closed?

  We did see the MTU column, but we never see something to our specific
address. We know that the ICMP is being received, because the packet sizes go 
down.

]       ON HUMILITY: to err is human. To moo, bovine.           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr@xxxxxxxxxxxxxxxxxxxxxx http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy");  [



-----BEGIN PGP SIGNATURE-----
Version: 2.6.3ia
Charset: latin1
Comment: Finger me for keys

iQCVAwUBPGQ8N4qHRg3pndX9AQHqGAQA3EVAP1shXUayLQ2JS8HMtG0cktC2KKue
a9aloKQF+lpodYZoesPArVM/upggF1Gvxoj72ch4psI1ojOvqMvthxyKBIrdacN4
S6Q7A+jNrPWl0h9pXUkbfqrf/ARWmSz/Yk3RxTbt1aQMEII0wSmGpP+PobVJ3nwX
8e9do9fQw9o=
=LIP9
-----END PGP SIGNATURE-----

<Prev in Thread] Current Thread [Next in Thread>