[Snort-users] Rules with "Established" option, not working

Joel Esler (jesler) jesler at ...589...
Mon Feb 10 10:37:56 EST 2014

Did you try this?


Joel Esler
Threat Intelligence Team Lead
Open Source Manager
Vulnerability Research Team

On Feb 10, 2014, at 10:06 AM, sami Sayko <saykosami at ...131...<mailto:saykosami at ...131...>> wrote:

Thank you for the quick answer.

I checked a pcap capture and, yes I can see the source and the destination and (the 3 way handshake).
And to give more precision :
If leave the rules with the flow:to_server, established, the rules will not be triggered.
I if remove the established key (so the rule contains flow:to_server), it works fine.


Le lundi 10 février 2014 9h13, Joel Esler (jesler) <jesler at ...589...<mailto:jesler at ...589...>> a écrit :
I assume then that Snort is not seeing both sides of the conversation because of the load balancer?

Can you confirm this by looking at a pcap?

On Feb 10, 2014, at 8:59 AM, sami Sayko <saykosami at ...131...<mailto:saykosami at ...131...>> wrote:


I'm using snort 2.9.5 (Windows), and official ET and snort rules.
I noticed a strange thing with the official rules :
The rules with established option never triggered, but if I remove the "established" option, all things we'll be ok !!!!

I'm using a normal configuration (default). Except that my web server is behind a load balancer.

Can someone help me to find a solution ?

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