What is the difference of security policy in session setup stage and fast path stage

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What is the difference of security policy in session setup stage and fast path stage

L2 Linker

Hi All,


Please could someone help me out in understanding this concept as I am a bit confused about this process.

I mean if App ID is ingonred then how is the traffic allowed to go to fast path stage if all the rules are configured using AppID rather than ports.




L7 Applicator

You should consider fastpath as more of a layer 3 or 4 process rather than app-id: when a session is being set up (syn packets et al), the firewall needs to check if source IP/zone, destination IP/zone and destination port are allowed. 

When a match is found, the packets are allowed through to complete the tcp handshake and a session is created. Once this phase is completed, the session goes into fastpath (basic 6 tuple was allowed by security) but app-id is still busy identifying the app

If anywhere after the 3rd packet an application is identified that is blocked (or not allowed) the session is still dropped


Fastpath is not the same as hardware offloading


Tom Piens

Hi Reaper,

Thanks for your response.

Please could clarify how the security policy is going to behave only if application is defined not the ports..?I will this traffic will be allowed.? 

In addition, Why again the security policy is checked in fast path, is it because of App-ID coming into action if the security policy is defined using Application as the match criteria.

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