[mythtv-users] Mythtv Backend, upnp and hamachi

[Raymond Wagner]

On 07/13/11 22:00, Steve Malenfant wrote:
> Anyway, the problem was hamachi. See how it does bind everything for
> UDP port 1900?
> udp   124576      0 0.0.0.0:1900            0.0.0.0:*
>          1206/hamachid

239.255.255.250:1900 is only used as the autodetection port for UPnP. 
Discovery and announcement packets are sent out by everyone to that
address.  Everyone listens on that address for announcements and
discovery requests.  When I say everyone, I mean the kernel handles
those addresses in a special manner that anything sent gets multiplexed
out to any and every application that wants it.

Discovery and announcement packets contain an address and port that
application can be reached at.  The address and port are irrelevant.  If
something else is already bound to the address you want, you pick a
different one and try again.  If the MythTV UPnP server fails to start
if it fails to bind to port 1900, that's probably something that should
be fixed.