[mythtv-users] MythTV needs to listen on 2 ports

[Raymond Wagner]

On 10/30/2014 12:14 PM, Russell Gower wrote:
> I don’t think you need the virtual network, just configure mythtv to 
> listen on one of the IP’s then configure 3 DNAT rules to forward the 
> ports from the other IP address to the one mythtv is listening on, you 
> should’t need to worry about the return traffic as you have direct 
> routes to both networks.

No.  No address translation here.  The one address MythBackend will be 
listening on is the one address MythFrontend will try to connect to it 
on.  The only way NAT could be made to work here is if you spoofed the 
frontend with custom settings on the command line, forcing it to try to 
connect using a different address, which you then clumsily translated 
back to the proper address.

The only time NAT should _EVER_ be used is when trying to link two 
networks that cannot numerically co-exist.  That means either linking a 
private network into a global address range, or two overlapping private 
networks.  Either situation is an indication of poor planning on 
someone's part.