Hi All, I receive this packet this morning : (join tcpdump file) 06:45:43.060280 192.168.123.3 > 81.51.107.127: (frag 0:20@55072) (ttl 243, len 40) 06:47:54.294323 192.168.123.3 > 81.51.107.127: (frag 0:20@55072) (ttl 243, len 40) 06:47:54.305377 192.168.123.3.3138 > 81.51.107.127.4662: R [tcp sum ok] 374411680:374411680(0) win 0 (DF) (ttl 243, id 0, len 40) Yes my ip pub is 81.51.107.127, and net 192.168.123 is not me ! Timezone: GMT+1 Paris. I not have any packet with net 192.168.123 and I not have any other packet fragmented ... This important is firestorm view bad traffic ... Firestorm event this : (VERY GOOD) Mar 26 06:47:54 crusoe 11 firestorm-nids053c: 1048657674.294327 alert=ipfrag sig=8.0 priority=5 src=cù¿¿¥Âca dst=Dù¿¿fýq~P~cù¿¿¥Âca proto=6 : Fragment arrived after teout Yes my patch syslog is bugged ! but firestorm event frag ... and snort not alarm/log this ! (snort 191b233) however snort view frag : ======================== Fragmentation Stats: Fragmented IP Packets: 2 (0.000%) Fragment Trackers: 1 Rebuilt IP Packets: 0 Frag elements used: 0 Discarded(incomplete): 0 Discarded(timeout): 0 Frag2 memory faults: 0 ========================= and conf : No arguments to frag2 directive, setting defaults to: Fragment timeout: 60 seconds Fragment memory cap: 4194304 bytes Fragment min_ttl: 0 Fragment ttl_limit: 5 Fragment Problems: 0 and prelude not view and not log ... Regard. PS: Sorry for my bad speak English.
Attachment:
frag.tcpdump.gz
Description: GNU Zip compressed data