It means its being truncated. Try adjusting the snaplen. You should be able to do -s 0 to make sure you capture the entire packet or you can specify a length such as -s 1024. Do a man tcpdump and search for snaplen.
ie: tcpdump -i fxp0 -s 0 udp port 1812
-Dusty Doris
Thanks for the information, i just read about it in the manual and the tcpdump guys said me the same!
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