[Snort-sigs] HTTP_PORTS Question

Matthew Jonkman matt at ...2436...
Wed Jul 14 06:18:33 EDT 2004

Thanks for the reply. I'd be interested to know if anyone has experience 
with the load that might cause.

Going to try it anyway. :)



sekure wrote:

> Matt,
> I believe another solution is to first define var HTTP_PORTS 80 and
> load all of your http rules, then redefine var HTTP_PORTS 8080 and
> reload the same rules.  Essentially saying:
> var HTTP_PORTS 80
> include $RULE_PATH/web-iis.rules
> include $RULE_PATH/web-apache.rules
> etc....
> var HTTP_PORTS 8080
> include $RULE_PATH/web-iis.rules
> include $RULE_PATH/web-apache.rules
> etc....
> i am not sure if this is more or less system load than defining
> HTTP_PORTS 80:8080.  It would be great to get someone knowledgable to
> comment.
> On Tue, 13 Jul 2004 23:32:00 -0500, Matthew Jonkman <matt at ...2436...> wrote:
>>Have a situation where we have a lot of proxied web users, and a lot of
>>non-proxied users. My dilemma is where to set the HTTP_PORTS variable.
>>Traffic on both 80 and 8080 will be passing the same sensors, can't
>>separate it feasibly. So I only get http coverage on one or the other
>>currently since we can't do 2 ports in a rule.
>>I've had a few thoughts, I'm interested in hearing anyone else's
>>experience here.
>>1. A second instance of snort on the same sensing interface with a
>>tcpdump parameter to show it only 8080 traffic, and a whole new config
>>for 8080. Would probably be best, but I'd prefer not to have another
>>config to manage there. This is a good level of traffic interface, might
>>start dropping packets??
>>2. Use 80:8080 for the HTTP_PORTS range. Probably a good deal higher
>>load, and some extra false positives. Sloppy solution.
>>Any other ideas?
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Matthew Jonkman, CISSP
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