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.