Re: snot processes packets twice?

[rmkml <rmkml () yahoo fr>]

Hi,
Can you try with last snort stable v2.9.2.3 and daq v0.6.2 ?
or latest snort release candidate (v2.9.3_rc) and daq v1.1.1 ?
Can you run daq dump ?
Regards
Rmkml



On Wed, 27 Jun 2012, jorbru30 () comcast net wrote:

> Thank you Russ for the tip.
> I checked for any bridge but there is none.
> mysnort@home:~/pcaps$ brctl show
> bridge name bridge id  STP enabled interfaces
> I captured pcaps at eth0 and eth1 and each show about 25,000 packets.
> I also added a print statement prior to "ProcessPacket" in snort.c to verify snort is indeed inspecting duplicate 
> packets. My findings is yes, it does inspect about 50,000 packets.
> I am still trying to figure out why snort checks packets from both interface and how to fix the issue.
> I appreciate any help.
> Jorda. 
>
> ____________________________________________________________________________________________________________________________________________________________________________________________________________________________
>
> From: "Russ Combs" <rcombs () sourcefire com>
> To: jorbru30 () comcast net
> Cc: snort-users () lists sourceforge net
> Sent: Wednesday, June 27, 2012 10:56:47 AM
> Subject: Re: [Snort-users] snot processes packets twice?
>
> Not sure why you are seeing double; any chance you bridged eth0 and eth1?
>
> On Wed, Jun 27, 2012 at 1:18 AM, <jorbru30 () comcast net> wrote:
>
>       Hi,
>       I am running snort version 2.9.1 as IPS using the following command.
>       /usr/local/snort/bin/snort --daq afpacket -i eth0:eth1 -Q --daq-dir=/usr/local/lib/daq -l /var/log/snort -c 
> /usr/local/snort/etc/snort.conf
>       I am sending packets from a traffic generator tool which acts as a sender and receiver.
>             Traffic generator(TGS)<-> eth0 <->eth1 <-> Traffic generator(TGR)
>       About 25,000 packets are seen at eth0 (packets sent from TGS and responses(mostly ack packets) from TGR).  The 
> same set of packets are seen at eth1.
>       After I stopped snort with ctr-c, snort displays ..."Snort processed 50531 packets".
>       I was expecting snort to process incoming packets (packets from eth0 to eth1) and outgoing packets (packets from 
> eth1 to eth0) which is about 25,000 but it processes double # of packets.
>       Please help me understand why snort process packets twice.
>       Thank you!
>       Jorda.
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users

Please visit http://blog.snort.org to stay current on all the latest Snort news!