from https://github.com/STJr/SRB2/blob/master/libs/miniupnpc/miniupnpc.c
SRB2 UPnP sub code may use HTTPU over UDP Port 1990 at [FF02::C], [FF05::C] and/or 239.255.255.250 to ask the internet router to port forward UDP traffic to your host, for hosting netgames, which is by default is UDP port 5029
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