Starcraft over Wireguard ... :sideeye:

[Eric Light <eric@ericlight.com>]

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Hi, awesome WG mailinglist!

My 18 year-old has recently moved out of home, and we're starting to
yearn for one of our traditional Starcraft matches.  I thought I should
be able to do this easily with Wireguard.
The idea, generally, is that one of us would start up a game, and
Wireguard - with a side serving of ProxyARP and IP forwarding - would
help make all the other computers see that game.  (or, at very worst,
allow me to run a game that could be seen by his computer AND the other
computers here).
-=-=-=-=-=-=-=-=-=-=-=-=-

On his computer:  (LAN IP 192.168.1.x)

> [Interface]
> PrivateKey = {blah}=
> ListenPort = 12457
> Address = 192.168.88.3/24
> 
> [Peer]
> PublicKey = {blah2}=
> Endpoint = {my home}:12457
> AllowedIPs = 0.0.0.0/0
> 

On my computer:  (LAN IP 192.168.88.x)

> [Interface]
> PrivateKey = {blah3}=
> ListenPort = 12457
> Address = 192.168.88.2/32
> 
> [Peer]
> PublicKey = {blah4}=
> AllowedIPs = 192.168.88.3/32

-=-=-=-=-=-=-=-=-=-=-=-=-

But it turns out not to be so easy.  Starcraft sets up games over UDP
5353 and UDP 6112, and originally I thought it was a problem with
forwarding UDP packets.  However, I can see packets coming over the
tunnel from his computer, but the packets are being forwarded to an
address I don't know:
> root@me:~# tcpdump -i home port 5353 or port 6112
> tcpdump: verbose output suppressed, use -v or -vv for full
> protocol decode> listening on home, link-type RAW (Raw IP), capture size 262144 bytes
> 20:02:35.744726 IP 192.168.88.3.6112 > 37.244.23.109.3478: UDP,
> length 10> 20:02:35.759142 IP 192.168.88.3.6112 > 37.244.23.109.3478: UDP,
> length 10> 20:02:35.759157 IP 192.168.88.3.6112 > 37.244.23.109.3478: UDP,
> length 10> 20:02:36.045323 IP 37.244.23.109.3478 > 192.168.88.3.6112: UDP,
> length 19> 20:02:36.099993 IP 37.244.23.109.3478 > 192.168.88.3.6112: UDP,
> length 19> 20:02:36.100005 IP 37.244.23.109.3478 > 192.168.88.3.6112: UDP,
> length 19> 20:03:05.964077 IP 192.168.88.3.6112 > 37.244.23.109.3478: UDP,
> length 10> 20:03:05.964118 IP 192.168.88.3.6112 > 37.244.23.109.3478: UDP,
> length 10> 20:03:05.987761 IP 192.168.88.3.6112 > 37.244.23.109.3478: UDP,
> length 10
Any ideas where I can start looking?  I get similar behaviour whether I
host the game on my computer or on his.
Thanks in advance for any help you guys can offer!

E

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