Before I describe my question or more particulary my problem in more detail, I want to first depict my basic approach:
Basicly what I'm trying to do is to create an inline on a linux bridge inside a docker container (operation system is alpine). For that I created a testing environment containing an example client and server via docker and implemented those container inside GNS3 for creating the desired network topology: server <--> bridge <--> client.
And here is the problem: the bridging is working fine (both client and server can ping eachother), but the prerouting of the marked packets to the loopback interface by lifting it up from the ethernet layer to the ip layer (so that I can use iptables rules on them) inside the docker container isn't working as expected (no incomimg packets on interface lo).
So my question is, whether this is a general problem from docker or from my configuration?
