topic Re: First Packet application detection mechanism in Firewall and Security Management

First Packet application detection mechanism

JChang — Fri, 03 Oct 2025 04:14:19 GMT

Hi,

As I know the first-packet application detection mechanism is important for identifying applications. Where can I find the detailed flowchat for the first-packet application detection engine of security gateway ?

Best Regards,

Jeremy

Re: First Packet application detection mechanism

the_rock — Fri, 03 Oct 2025 13:08:04 GMT

Do you have an issue with app control or you just need doc about it? Maybe below can help?

Andy

https://sc1.checkpoint.com/documents/R81.10/WebAdminGuides/EN/CP_R81.10_Quantum_SecurityGateway_Guide/Topics-FWG/Application-Control-Blade.htm

Re: First Packet application detection mechanism

Chris_Atkinson — Fri, 03 Oct 2025 14:15:01 GMT

You will want to explore the concept of "Protocol Signatures" further as related to this.

https://community.checkpoint.com/t5/Management/Enable-Protocol-Signature-by-default/m-p/139285/highlight/true#M29469

https://community.checkpoint.com/t5/General-Topics/Protocol-Signatures/td-p/54945

https://community.checkpoint.com/t5/General-Topics/Protocol-Signatures/td-p/107564

Re: First Packet application detection mechanism

the_rock — Fri, 03 Oct 2025 14:41:49 GMT

Thanks for those Chris, very useful.

Andy

Re: First Packet application detection mechanism

PhoneBoy — Fri, 03 Oct 2025 18:06:59 GMT

You might want to have a look at the Web Filtering Best Practices session I just did, which will likely help your understanding.

Re: First Packet application detection mechanism

the_rock — Fri, 03 Oct 2025 18:10:19 GMT

Totally super useful!

Re: First Packet application detection mechanism

the_rock — Sun, 05 Oct 2025 18:41:41 GMT

Hi Jeremy,

These can also help.

Best,

Andy

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https://support.checkpoint.com/results/sk/sk163594

https://support.checkpoint.com/results/sk/sk167052

https://support.checkpoint.com/results/sk/sk182812