[Snort-users] Looooots of "Outstanding" and "Analyzed" packets - counter wrap ?

Justin Heath justin.heath at ...11827...
Mon Nov 27 09:56:39 EST 2006


Do you see this same type of behaviour when running for a short period
of time  (5 minutes, for example)? If so, can you run a tcpdump (no
snaplen limit, no filters and writing out to a file) during the same
period? Once you have the traffic captured read back the pcap with
'-r' and see if you still get the same stats. If so, please send the
pcap to bugs at ...10585...


Thanks,
Justin

On 11/22/06, Andreas Maus <maus at ...13999...> wrote:
> Hi.
>
> I'm running Snort Version 2.6.1 (Build 24) inline and
> don't have any problems so far.
>
> But after a look at the stats Snort generates after
> a restart (after stop) I start to think about their
> meanings. Especially the number of "Analyzed" and
> "Outstanding" packets:
>
> [... snipp ...]
> Snort ran for 0 Days 19 Hours 37 Minutes 20 Seconds
> Packet analysis time averages:
>
> Snort Analyzed 270 Packets Per Hour
> Snort Analyzed 4 Packets Per Minute
> Snort Analyzed 0 Packets Per Second
>
> Snort received 5145 packets
>     Analyzed: 37793(734.558%)
>     Dropped: 0(0.000%)
>     Outstanding: 4294934648(358537307160051712.000%)
>     ===============================================================================
>     Breakdown by protocol:
>       TCP: 23839      (63.078%)
>       UDP: 3472       (9.187%)
>      ICMP: 265        (0.701%)
>       ARP: 10217      (27.034%)
>     EAPOL: 0          (0.000%)
>      IPv6: 0          (0.000%)
>   ETHLOOP: 0          (0.000%)
>       IPX: 0          (0.000%)
>      FRAG: 0          (0.000%)
>     OTHER: 0          (0.000%)
>   DISCARD: 0          (0.000%)
>     ===============================================================================
>     Action Stats:
>
> [... snipp ...]
>
> O.K. no packets are dropped which is a Good Thing (tm), but where does
> the odd counters for analyzed (over 700 % ?) and outstanding packets
> (358537307160051712.000% ! *gasp*)? The number of outstanding packets
> looks strange. If I subtract the number of outstanding packets from
> 2^32 I will get a more reasonable number of 32648. Counter wrap ?
>
> Any comments/hints would be helpfull.
>
> Many thanks in advance,
>
> Andreas.
>
> P.S.: The system is running Debian 3.1 (stable) with:
> debian3164m:~# uname -a
> Linux debian3164m 2.6.8-12-amd64-k8-smp #1 SMP Tue Sep 19 01:04:26 UTC 2006 x86_64 GNU/Linux
>
>
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