Ethereal-dev: [Ethereal-dev] Incorrect UDP checksum when using router header?

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From: Yaniv Kaul <ykaul@xxxxxxxxxxxxxx>
Date: Tue, 15 Apr 2003 15:54:04 +0200
I'm sending UDP packets from 3ffe:0:c0a8:979:290:27ff:febd:6ba9 to 3ffe:0:a09:c901:2e0:18ff:fe22:391f via 3ffe:0:c0a8:9c9:2a0:8eff:fe0c:2e1, using router header option. It seems that the UDP checksum, when going out from the client is incorrect, at least according to Ethereal. They are correct on the server, therefore I think the checksum calc is done prior to taking into account the routing.
I'm using mgen6 as the client producing those packets, perhaps the error is there.
Attached please find client and server tcpdumps. Please take a look at the client's 2nd and 3rd packets. 

Any ideas who's fault is it? (IPv6 stack, Ethereal, mgen6) ?
mgen6 is from http://matrix.it.uc3m.es/~long/software/mgen6/mgen6/, version 3.2.6 
IPv6 stack - both vanilla RH 7.3, and USAGI 20030331 kernel.
Ethereal 0.9.11

Attachment: route_hdr_client.cap
Description: Binary data

Attachment: route_hdr_server.cap
Description: Binary data