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systemd IP filtering: No counters, no logs. Packets disappear. (fed.dyne.org)

submitted 2 months ago by jaromil@fed.dyne.org to c/planetdyne@fed.dyne.org

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[–] jaromil@fed.dyne.org 1 points 2 months ago

https://rachelbythebay.com/w/2024/07/17/bpf/ systemd injects bpf program(s) when you filter traffic by IP address in a .service file. It rejects traffic by dropping it🚮past the ip[6]tables match, and well before it would generate a SYN/ACK. No counters, no logs. 🫥 Packets disappear. 🫧