[Snort-devel] Active response on two interfaces

Russ Combs rcombs at ...402...
Wed May 9 13:27:30 EDT 2012


You may get different results with a newer Snort.

On Wed, May 9, 2012 at 1:18 PM, Jon Larson <jlarson at ...3287...> wrote:

> **
> Snort is Version 2.9.0.5
> DAQ is 0.5 I think.
>
> The storm occurs when I have a rule configured like this:
> alert tcp [192.168.10.10] any -> [192.168.20.11] any (resp:reset_both;
> flow:to_server,established; )
>
> Anyway, snort isn't really *supposed* to be used like a firewall in this
> manner so we've moved on.
>
>
> On 5/8/2012 9:57 PM, Russ Combs wrote:
>
> What version of Snort and DAQ are you using?  Snort has a check to prevent
> RST to RST.
>
> On Tue, May 1, 2012 at 7:46 PM, Jon Larson <jlarson at ...3287...> wrote:
>
>> I/we need to get snort to operate on two interfaces.  For simplicity,
>> let's just say I want to have snort monitor traffic on eth0, but then
>> send its resets out on eth1.  What's the configuration magic to allow
>> this?
>>
>> I've tried something like this in the snort.conf:
>> config response: device eth1 attempts 2
>>
>> This, however, seems to get snort into this mode (when it detects some
>> TCP connection it's configured to reset) where it "sniffs" back in the
>> RST packet (on the other interface), then sends another RST packet.
>> Kinda like "eating it's own tail".  The snort process consumes the CPU
>> and floods the network in this mode.
>>
>> Also is there documentation someone could point me to regarding
>> configuring snort for multiple interfaces?
>>
>> Any and all information would be greatly appreciated!
>> Jonny L.
>>
>>
>>
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>
>
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