Subject: Re: pmtu discovery on SA

From: Patrick McHardy <[email-masked]>
Date: Wed, 18 Jul 2007 15:14:42 +0200

Beschorner Daniel wrote:
>>>No more crashes with IPComp and smaller PMTUs.
>>>But the "pmtu discovery on SA ESP/..." messages don't disappear.
>>
>>Thats probably a different issue. Please post the output of
>>"ip -x xfrm state" (obfuscate keys if you care ..).
> 
> 
> Linux (MTU 1500) <-> ADSL router (1492) <-> ... <-> Linux (1500)

In a previous mail you mentioned:

> The router on the ADSL line (behind an ADSL Netopia router via Ethernet)
> crashed too with 1500, now it uses 1492.

So its using 1492 now? Otherwise it would be expected since the
initial MTU calculation would be based on 1500.

Please capture a full ICMP packet (with -s0) and send me the
binary dump.