do the messages apear when the windows machines a booting ?
i would tend to think that the kernel cannot handle the NET on
IGMP packets so its printting a message about it
the packets do look like they are goign to a multicast address
>
>Feb 1 12:58:56 obelix kernel: NAT: 0 dropping untracked packet ce767600 1 129.69.22.21 -> 224.0.0.2
>Feb 1 12:59:01 obelix kernel: NAT: 0 dropping untracked packet ce767480 1 129.69.22.21 -> 224.0.0.2
>Feb 1 12:59:04 obelix kernel: NAT: 0 dropping untracked packet ce767d80 1 129.69.22.21 -> 224.0.0.2
>Feb 1 13:00:44 obelix kernel: NAT: 0 dropping untracked packet ce767600 1 129.69.22.51 -> 224.0.0.2
>Feb 1 13:00:47 obelix kernel: NAT: 0 dropping untracked packet ce767600 1 129.69.22.51 -> 224.0.0.2
>Feb 1 13:00:50 obelix kernel: NAT: 0 dropping untracked packet ce767b40 1 129.69.22.51 -> 224.0.0.2
>
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