This is my entire frag3 config:
preprocessor frag3_global: max_frags 65536
preprocessor frag3_engine: policy linux bind_to
[65.241.66.7,65.241.66.8,65.241.66.9,65.241.66.12,65.241.66.13,65.241.66
.70]
preprocessor frag3_engine: policy windows bind_to
[65.241.66.15,65.241.66.16,65.241.66.25]
preprocessor frag3_engine: policy first detect_anomalies
Drew Burchett
United Systems & Software
http://www.united-systems.com
Phone: (270)527-3293
Fax: (270)527-3132
-----Original Message-----
From: Joel Esler [mailto:joel.esler@sourcefire.com]
Sent: Monday, May 22, 2006 1:38 PM
To: Drew Burchett
Cc: snort-users@lists.sourceforge.net
Subject: Re: [Snort-users] frag3 alerts
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How do you have the rest of the frag3 entries set? Or is that the
only
entry you have?
Joel
Drew Burchett wrote:
Well, I'm pretty sure I've got that set right. The host is running
Suse
Linux 10.0 and I've got the configuration set to:
preprocessor frag3_engine: policy linux bind_to 65.241.66.12
That seemed to be how I should have it set according to the chart in
README.frag3.
Drew Burchett
United Systems & Software
http://www.united-systems.com
Phone: (270)527-3293
Fax: (270)527-3132
-----Original Message-----
From: Joel Esler [mailto:joel.esler@sourcefire.com]
Sent: Monday, May 22, 2006 1:31 PM
To: Drew Burchett
Cc: snort-users@lists.sourceforge.net; rmkml
Subject: Re: [Snort-users] frag3 alerts
Of course. Frag3 is target based (tuned to the OS) of your machine.
Therefore you need to create an entry in your snort.conf
specifically
tuned to the OS of your DNS server (and any other host on your
network)
If you need further help, feel free to email the list or me
personally,
however, please review the examples in the snort.conf under the
frag3
heading.
Joel Esler
Drew Burchett wrote:
From examining the packet capture, I?ve determined that the
?offending?
traffic is an NXDomain response from a valid root server. It?s
being
caused by doing reverse lookups on spam email.
However, the question remains, is there any way I can fine tune
the
frag3 preprocessor to avoid these false positives?
Drew Burchett
United Systems & Software
http://www.united-systems.com
Phone: (270)527-3293
Fax: (270)527-3132
* From: * snort-users-admin@lists.sourceforge.net
[mailto:snort-users-admin@lists.sourceforge.net] *On Behalf Of
*Drew
Burchett
*Sent:* Monday, May 22, 2006 11:18 AM
*To:* snort-users@lists.sourceforge.net
*Subject:* [Snort-users] frag3 alerts
I am seeing a lot of frag3 Fragmentation overlap alerts with my
DNS
server as the destination and a source address that reverses to a
root
server. When examining the packets, the traffic seems to be
valid
DNS
traffic, although it has nothing to do with any domains that I
host.
Is
this some sort of attack, or is it valid traffic that is throwing
false
positives? If it is a false positive, is there any way I can
fine-tune
the frag3 preprocessor to avoid these?
Drew Burchett
United Systems & Software
http://www.united-systems.com
Phone: (270)527-3293
Fax: (270)527-3132
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