I'm trying to secure my linux box (debian stable amd64) which is running
mainly l4d and l4d2 servers, but i don't seem to be able to find the
right way to set up my firewall. I'm using bastille at the moment, which
is pretty straightforward, but i notice a lot of packets from the
clients are getting rejected because they're not being sent to the right
ports. I've been told i should only worry about opening the ports that i
specify on the server startup line, since i'm not putting any rule to
block outbound connections.
Is there a pattern of some sort in the service ports? Allowing TCP\UDP
only on the hostports isn't causing any trouble for the players, from
what i could see, but i wouldn't want to block any other port and
possibly mess up.
How did you guys deal with the issue? Is there some good source of
information you would reccomend?
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