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Left 4 Dead, Linux and Firewall

For days now I have been struggling to get serious information about required Ports. The only thing I have found are things like

"Forward Port 27015-28000".

Well, I am not forwarding, I have a (real) Server with direct connection. There are some better instructions that give "details" like this:

Port 27015, UDP.

Better. But still not sufficing.

For some odd reason I have the feeling that the vast majority allow all outgoing packets, as I can not find any complete guide in this form:

27015 UDP
27015 TCP

27015 UDP

In short: Is there an advanced Port Guide out there that lists Ports needed required for a full firewall? That is..

Protocol: UDP or TCP
Direction: IN or OUT.

Many thanks for your support.


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