Security Incidents mailing list archives

Re: ICMP time exceed in-transit packets


From: Alain.Thivillon () HSC FR (Alain Thivillon)
Date: Sat, 1 Jan 2000 21:05:27 +0100


Chris Brenton <cbrenton () SOVER NET> écrivait (wrote) :

So the attacker transmits the above packet. While in transit, the TTL
drops to zero. The router receiving the TTL 0 packet realizes it can not
forward it and issues a time exceeded (ICMP type 11) packet back to the
spoofed source address. So what you are seeing in your logs is the error
code generated by the spoofed packets when the TTL expires.

Well, you are saying someone is tracerouting you. Congratulations :)

--
Unix is ending in 13897 days, 7 hours, 9 min, 55 sec : save your buffers



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