[Snort-users] Snort IPS - slow file transfer problem

Anton Bezkrovny anton.bezkrovny at ...17574...
Thu Jun 16 08:59:28 EDT 2016

Snort running on VM at esxi
4 gb ram, 2x2 Ghz CPU.
On esxi all NIC are VMXNET3.
Im turn off all rules and preprocessors.
On snort running:

top - 15:55:09 up  1:14,  3 users,  load average: 0.00, 0.01, 0.05
Tasks: 171 total,   1 running, 170 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.5 us,  2.2 sy,  0.0 ni, 97.0 id,  0.0 wa,  0.0 hi,  0.3 si,
0.0 st
KiB Mem :  3882704 total,  2953356 free,   556028 used,   373320
KiB Swap:  2097148 total,  2097148 free,        0 used.  3110912 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+
 5524 snort     20   0  253396 166648 137936 S   4.3  4.3   0:00.28 snort
 3178 root      20   0  149964   6580   5192 S   1.0  0.2   0:00.20 sshd
But while I'm copying file, max speed as about ~100kb\s.

-----Original Message-----
From: wkitty42 at ...14940... [mailto:wkitty42 at ...14940...]
Sent: Wednesday, June 15, 2016 4:03 PM
To: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Snort IPS - slow file transfer problem

On 06/15/2016 07:59 AM, Anton Bezkrovny wrote:
> Hello!
> I have faced a problem of low speed of files copying during Snort
> realization in the IPS mode.
> The file is copied from one computer to another, communication between
> them is provided through Snort bridge.

what are the specs of the snort bridge? CPU, RAM, NICs being the most
important... what we're looking for is a bottleneck... maybe the CPU is in
high usage during the file transfer or possibly you have a lot of swap
being used...
consumer-grade NICs generally rely on the CPU to do the heavy lifting of
data moving whereas server-grade NICs do that heavy lifting on their own
which leads to faster processing...

assuming your snort bridge is a *nix box, what does your resource
consumption look like?

   free -m; echo; top -n 1 -b | head -n 5

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