Snort mailing list archives

RE: *NIX ping alerts


From: Jason Gauthier <jgauthier () lastar com>
Date: Mon, 24 Jun 2002 16:55:33 -0400

I'll give that a try. Thanks.

Not sure how a NAT'd packet from a single monitoring node could have one
of 256 addresses.  
Sounds fishy...


Because my firewall has a pool of public addresses it gives to an outbound
connection.
It translates between them:

Note, these IP addresses are fake.

Public                   Private
------                   --------
130.19.11.45    =>       10.10.1.100

This only holds in the xlate table for 5 minutes. When it connects the next
time it could be:

Public                   Private
------                   --------
130.19.11.119    =>       10.10.1.100


So, really, not 256 addresses, my pool is like 90.





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