[Snort-users] Alerts with the incorrect Source IP (proxy server)

Turnbough, Bradley E. bturnbough at ...15650...
Wed Oct 24 14:27:34 EDT 2012


Stupid question, but enable_xff doesn't exist in my snort.conf.  Where does it go?



From: Joel Esler [mailto:jesler at ...1935...]
Sent: Wednesday, October 24, 2012 1:10 PM
To: Jeremy Hoel
Cc: Turnbough, Bradley E.; snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Alerts with the incorrect Source IP (proxy server)

If you have additional logging turned on, and your proxy supports it, (and you have "enable_xff") turned on in the snort.conf we'll log the actual IP in the additional data in the unified2 file.

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire

On Oct 24, 2012, at 1:27 PM, Jeremy Hoel <jthoel at ...11827...<mailto:jthoel at ...11827...>> wrote:


What snort alerts what the IPs are from inside the packet. If you
tcpdump that same connection and you are seeing the proxy talk to the
client, and that's the packets that are making the alert then the way
to fix that is to move the span port location.  Snort only reports
what it sees and it can't 'infer' what the original source of the
packets are.

But more examples of your network layout and an example of the alert might help.

On Wed, Oct 24, 2012 at 5:04 PM, Turnbough, Bradley E.
<bturnbough at ...15650...<mailto:bturnbough at ...15650...>> wrote:

Hi Guys,



I'm getting alerts generated, but they are coming up as the source IP of my
proxy server.  Is there a way to tell Snort / Barnyard2 / Snorby that it
should report the IP address of the website instead?



Thanks,

Brad



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