[mythtv-users] upnp different subnet
macdonald.matthew at gmail.com
Sun May 4 15:06:46 UTC 2008
On Sat, May 3, 2008 at 11:11 PM, Bill Williamson <bill at bbqninja.com> wrote:
> On Sun, May 4, 2008 at 12:30 PM, Daniel Agar <daniel at agar.ca> wrote:
> > I'm trying to get a ps3 to connect to my mythbackend via upnp over
> > wireless on a different subnet. I only allow communication between the 2
> > subnets for specific hosts and ports. This works properly when I have the
> > ps3 and mythbackend on the same subnet with no firewall. So far I've tried
> > 1900/udp but myth still isn't showing on the ps3. Are there other ports
> > needed for this? Is the ps3 simply not picking up the broadcast on the
> > different subnet? Any thoughts/suggestions would be greatly appreciated.
> UPnP is UDP multicast with a 1 TTL. That means 1 subnet only. This is by
> design for UPnP.
The standards for UPnP specify a default TTL of 4 and it looks like
Myth implements it with this TTL. Two things that you might try:
1.) Make sure that your firewall is allowing the traffic. UPnp uses
multicast. My Myth uses the multicast address 18.104.22.168 so I'm
assuming that yours will to. AFAIK you will need to allow traffic
from both your MythTV and ps3 to this address
2.) Make sure that the router is multicast aware.
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