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lanhampr
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Do BGP packets not get filtered?

Fri Feb 03, 2023 1:40 am

Do BGP packets not get filtered? I drop all and allow only what I want to input. I have not allowed BGP packets via an input rule yet my BGP is up and running. So I am a bit confused by this outcome.
 
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felixhappy
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Re: Do BGP packets not get filtered?

Fri Feb 03, 2023 12:04 pm

Hello lanhampr,

in BGP, both routers can initiate the BGP session. Maybe your router connects to the other Router on TCP 179 and creates a NEW outbound session. I guess you already have a rule at the top of the input chain that allows established/related sessions (since this is common in a stateful firewall configuration) that allows the answer back from the neighboring router.

You can check this by going to IPv4 - Firewall and checking the open connections if your router established the BGP session outgoing.
 
lanhampr
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Re: Do BGP packets not get filtered?

Fri Feb 03, 2023 5:45 pm

Ahh, that make's complete sense now. Thank you!

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