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But why am I then allowed to ping an outside website like google.com?
– akastack
Commented May 4, 2023 at 12:46
Because it matches the rules with RETURN target and so it's returned to calling chain and so on up to originating chain and there it will be processed by other rule that matches the criteria. As there are specified no restriction rules at all outgoing traffic is allowed.
– Consideratus
Commented May 4, 2023 at 13:09
I understood rule 1 of Chain DOCKER-ISOLATION-STAGE-2 as dropping packets that are outgoing (leaving the virtual interface docker0). Could you clerify why a packet ping from a container to outside network would not be dropped?
– akastack
Commented May 4, 2023 at 13:25
It won't match first rule because outgoing interface is not docker0.
– Consideratus
Commented May 4, 2023 at 13:41
What is the outgoing interface then, if not docker0? Perhaps this is why I am confused. What would the outgoing interface for a ping packet from within the container to the outside internet?
– akastack
Commented May 5, 2023 at 8:30

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