ICMP Source routed packets

[Raphael Bauduin <rb@tiscali.be>]

Hi,

I have this in my dmesg:

ICMP: XXX.XXX.XXX.XXX: Source Route Failed.

>From the info I found, it means this machine sent a ICMP source routed packet 
and that this packet was rejected by the machine XXX.XXX.XXX.XXX (this is a 
web server....).
>From what I see, the linux kernel rejects source routed packet (option 
CONFIG_IP_NOSR=y). But is this only for IP packets or is it applied to ICMP? 
If it applies to ICMP, how come I get this error?

I wanted to use tcpdump to dump all ICMP source routed packets, but I don't 
know how to setup the filter to only dump those packets.... Which fields 
allow me to determine that it is a source routed packet?

Thanks for your help!

Raph


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