Snort mailing list archives

inbound alerts only


From: "David" <dwad24 () excite com>
Date: Thu, 26 Jun 2003 13:39:45 -0400 (EDT)

 Hello everybody,I am having a sorta weird problemo. I looked through the FAQ and did a web search etc. but didn't find 
any solution to my problem. (or maybe didn't look effectively enough) I have snort running on a solaris box right 
outside a firewall with a stealth interface. I added this rule: 'alert tcp any any -&gt; xxx.xxx.xxx.xxx 22' and tried 
to ssh to the x'd out IP from an internal machine; No alerts were triggered. Upon noting that such a simple rule wasn't 
working, I looked through all my previous alerts and noticed that not a single alert was from one of our internal 
machines going outbound ( I would at least expect a false positive or two here and there since we use 'any' as our 
$HOME_NET and $EXTERNAL_NET). All alerts were from external machines coming into our network. Has anyone seen anything 
like this before? Is there a setting somewhere which states only look for inbound bad traffic? Could our firewall be 
somehow mangling the traffic enough that it doesn't 
 quite match a rule somehow; e.g NAT or something? I have tried several different tests to try to figure out what is 
going on but to no avail.. Any thoughts? I am missing something really obvious?Thanks Everyone! Dave

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