[Snort-users] Snort dropping more packets than it received

Scott Finlon scott.finlon at ...15821...
Wed Sep 12 12:06:20 EDT 2012


The stats output by PF_RING and DNA are different.
Those files look like this with DNA, and don't show drops:
Bound Device(s)    :
Active             : 1
Breed              : DNA
Sampling Rate      : 1
Capture Direction  : RX+TX
Socket Mode        : RX only
Appl. Name         : <unknown>
IP Defragment      : No
BPF Filtering      : Disabled
# Sw Filt. Rules   : 0
# Hw Filt. Rules   : 0
Poll Pkt Watermark : 128
Num Poll Calls     : 1007017
Channel Id         : 0
Num RX Slots       : 8192
Num TX Slots       : 8192
Tot Memory         : 25952256 bytes

Ifconfig dna1 shows no drops either:
dna1      Link encap:Ethernet  HWaddr 68:05:CA:0C:4A:FD
          inet6 addr: fe80::6a05:caff:fe0c:4afd/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:2815563924 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2307501192749 (2.0 TiB)  TX bytes:0 (0.0 b)
          Memory:f7a00000-f7c00000

Scott Finlon
-----------------------------------
Information Security Engineer
The University of Scranton
email : finlons2 at ...15821...
phone : 570-941-6168
-----------------------------------


-----Original Message-----
From: Peter Bates [mailto:peter.bates at ...15381...] 
Sent: Wednesday, September 12, 2012 11:56 AM
To: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Snort dropping more packets than it received

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Hash: SHA1


Hello all

On 12/09/2012 16:19, Scott Finlon wrote:
> I just installed Snort to run on 8 instances via PF_RING DNA, and 
> whenever I dump the stats via kill -usr1 or end the processes the 
> numbers just don't add up. Is this an issue with the way Snort is 
> adding, or could it be something else?

I'm not using DNA (just normal PF_RING) but my stats look considerably more healthier than yours.

What sorts of stats are you seeing in /proc/net/pf_ring/x ?

Something on the lines of

egrep 'Packet|Lost' /proc/net/pf_ring/*|egrep -v ': 0'

is fairly useful.

- --
Peter Bates
Senior Computer Security Officer    Phone: +44(0)2076792049
Information Services Division	    Internal Ext: 32049
University College London
London WC1E 6BT
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