ICMP paketa apo mars.sharpcomm.com

[S. Ksenitelis]

Se synexeia apo to e-mail tou Mixali Kabriani
<mkabrian at auadec.aua.ariadne-t.gr> (mailling list:greek-linux-users) 
sxetika me ICMP paketa me lauos checksum, episynaptv ta
parakatv:

Apr 13 22:20:23 chloe kernel: ICMP: failed checksum from 209.64.238.3!
Apr 15 22:12:13 chloe kernel: ICMP: failed checksum from 209.64.238.3!
Apr 11 21:34:30 chloe kernel: ICMP: failed checksum from 209.64.238.3!

(To roloi ths chloe paei 2 ores mprosta, opote afaireite 2h)

To tcpdump edeije:

22:12:13.820000 mars.sharpcomm.com > 143.233.170.255: icmp: echo request

opote to paketo htan broadcast.

To mars.sharpcomm.com fainetai na einai ena Redhat Linux 4.2 me
pleonazouses ypiresies anoiktes.

Yparxei to endexomeno to source ip na einai spoofed.

Ua itan kalo na ginotan ena "grep ICMP\:\ failed\ checksum
/var/log/messages.*" kai na staluoun ta apotelesmata sth lista.

Simos KSenitellis


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