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[TUTORIAL] Xonotic Server behind OPNSense (and pfSense)

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Information 
When NATting behind a OPNSense (or pfSense) firewall, setting up a port-forward is enough to let people manually connect to your Xonotic server when they know the IP and the port. However, the server is not showing up in the in-game server list or dpmaster.deathmask.net. This can be solved.
The description below is based on OPNSense, but it can probably be applied to pfSense too, because they share a lot. Some settings may be in a slightly different place or have a slightly different names though.

First: the port-forward:
  • Go to Firewall - NAT - Port Forward
  • Click +Add
  • Interface WAN
  • Protocol UDP
  • Destination WAN address
  • Destination port range (other) [port of Xonotic Server] (from en to)
  • Redirect target IP Single Host or Network [IP of Xonotic Server]
  • Redirect target port (other) [port of Xonotic Server]
Second: make outbound NAT rule:
This is to disable source port rewriting. Xonotic (and other Quak'ish games don't like it)
Read  more about it here.
  • Go to Firewall-NAT-Outbound
  • Click  on Hybrid outbound NAT rule generation
  • Click +Add
  • Interface WAN
  • Protocol UDP
  • Source Address Single host or Network [IP of Xonotic Server]/32
  • Source port (other) [port of Xonotic Server]
  • Destination address any
  • Destination port any
  • Enable Static-port

Especially the last is very important!
I hope this helps some people.
I'm leaving this here because it took me ages to find this out.
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