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

Y M snort at ...15979...
Mon Dec 10 14:15:28 EST 2012


Hey JJC,

No BPF arguments, we do not use them.

I ran a couple of tcpdump statements with first being generic and I can see TCP, UDP, and ICMP. The last is being too specific to TCP only from a machine/host im generating specific traffic from so l can tag and correlate the traffic im generating and seeing in the tcpdump capture. I used the same specifics with Snort in verbose mode and I can correlate with the TCP traffic im generating.

Running Snort in console (-A console) generates only UDP and ICMP alerts only. I'm testing with several TCP based rules that I would normally see/able to replicate or generate.

Snort statistics, some of it at least:

ICMP: 0.186%
UDP: 17.929%
TCP: 48.667%
Dropped: 0
Analyzed: 247964 (100%)

Thanks.
Yaser
________________________________
From: JJC<mailto:cummingsj at ...11827...>
Sent: ‎12/‎10/‎2012 9:12 PM
To: Castle, Shane<mailto:scastle at ...14946...>
Cc: Y M<mailto:snort at ...15979...>; Lay, James<mailto:james.lay at ...15009...>; snort-users at lists.sourceforge.net<mailto:snort-users at ...3893...t>
Subject: Re: [Snort-users] No TCP alerts, only UDP and ICMP

or any BPF added to the end as a runtime arg?  How about just running
a tcpdump with a snaplen of 0 and write to a pcap to see...

On Mon, Dec 10, 2012 at 10:58 AM, Castle, Shane
<scastle at ...14946...> wrote:
> 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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