I have two separate DD-WRT routers which I would like to bridge together so that computers connected to each are on the same subnet (so that multicast can work between them for UPNP/DNLA media sharing)
Each DD-WRT router has its own internet connection with a gigabit connection between them on the WAN port and both have their own public IP.
INTERNET-------- | | [Gigabit Switch] | | [DD-WRT A] [DD-WRT B] | | [LAN A] [LAN B] [192.168.11.0/24] [192.168.12.0/24]
I only have control over the DD-WRT boxes and the LANs they control. (not the switch)
I've followed this guide http://www.dd-wrt.com/wiki/index.php/Linking_Subnets_with_Static_Routes and treated Router1 as the switch and left both of the DD-WRT routers in gateway mode. This allowed both of the subnets to speak to each-other, but multicast would not work across them.
I'd like to find a way to make multicast to work across the two subnets or somehow split one subnet over both routers. Connecting the routers directly to each other is not an option as they are not located physically near each other.
I've also looked into the idea of using one router as a VPN server and another as a client. But this only put the client router on the server router's subnet and not all the computers attached to that router, unless I did something wrong. I'd also like each router to use its own internet connection and not send it all through a single connection, if possible.