Martian source??

Hi What does it mean when I get messages with 'martian source' in my /var/log/messages file? This occurred after I compiled the kernel myself. I've gone back to the precompiled kernel where the messages aren't shown... --- Mar 27 17:35:05 suse kernel: martian source 192.168.3.50 from 192.168.3.20, on dev eth1 Mar 27 17:35:05 suse kernel: ll header:00:48:54:7a:05:b6:00:48:54:7a:04:70:08:00 Mar 27 17:35:05 suse kernel: martian source 192.168.3.50 from 192.168.3.20, on dev eth1 Mar 27 17:35:05 suse kernel: ll header:00:48:54:7a:05:b6:00:48:54:7a:04:70:08:00 --- Cheers, Cor. suse@csoft.nu