[Snort-users] ICMP Time-To-Live Exceeded in Transit

Erwin Van de Velde erwin.vandevelde at ...10361...
Tue Dec 23 03:05:00 EST 2003


I'm using snort 2.1.0 and I'm getting quite a lot of these alerts (43% of the 
total of alerts). All packets that are logged, are going to a computer behind 
my router. I'm using NAT on the router, and my internal network has only one 
computer behind it: Router has (DHCP configured IP, 
as IP addresses. What can I do to get rid of all these messages, except 
disabling this rule? Is there a way to tweak snort, so that it does not 
generate these false positives anymore? 
Is it an error caused by shorewall, that I use on the router for NAT, or is 
there another reason why these alerts are generated?

Thanks in advance,

Erwin Van de Velde
Student of Antwerp University

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