[Snort-users] No TCP alerts, only UDP and ICMP

Castle, Shane scastle at ...14946...
Mon Dec 10 12:58:45 EST 2012


Was wondering - you wouldn't by chance be running with a filter via the "-F" runtime switch (or "config bpf_file" in snort.conf), would you?

-- 
Shane Castle
Data Security Mgr, Boulder County IT

-----Original Message-----
From: Y M [mailto:snort at ...15979...] 
Sent: Monday, December 10, 2012 10:29
To: Lay, James; snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] No TCP alerts, only UDP and ICMP

Hi Lay,

Sorry for my late reply. I wouldn't be able to provide a pcap file, at least for now.

However, I tried that in Snort, using the -K pcap (I also tried the -b switch) and read that through tcpdump, and I only got UDP packets, with some ICMPs. Running Snort in verbose mode shows that the majority of the traffic is in fact TCP.

Thanks.
YM
________________________________

From: Lay, James <mailto:james.lay at ...15009...> 
Sent: ‎12/‎10/‎2012 7:14 PM
To: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] No TCP alerts, only UDP and ICMP



Got a small pcap you could share?

 

James

 

From: Y M [mailto:snort at ...15979...] 
Sent: Monday, December 10, 2012 9:01 AM
To: Justin Knox
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] No TCP alerts, only UDP and ICMP

 

Hi Justin,

Yes I did. I also tried/compared with previously working conf files, conf file in the tarball, and the conf  file from Snort labs but the behavior remained the same across all configurations.

Thanks.
YM

________________________________

From: Justin Knox <mailto:jknox at ...16001...> 
Sent: ‎12/‎10/‎2012 6:49 PM
To: Y M <mailto:snort at ...15979...> 
Cc: Marcos Rodriguez <mailto:marcos.e.rodriguez at ...11827...> ; snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] No TCP alerts, only UDP and ICMP

Hi YM, 

have you verified that frag3 and stream5 are configured and enabled to support tcp?

 

-Justin

 

On Mon, Dec 10, 2012 at 10:23 AM, Y M <snort at ...15979...> wrote:

Hi Marcos,

Thanks for your reply. I did try with -k none as suggested and I'm getting the same results, no TCP alerts, just UDP and ICMP.

________________________________

From: Marcos Rodriguez <mailto:marcos.e.rodriguez at ...11827...> 
Sent: 12/10/2012 5:50 PM
To: Y M <mailto:snort at ...15979...> 
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] No TCP alerts, only UDP and ICMP

Hi YM,

Could you try again by adding '-k none' please?


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