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I have an interesting networking problem that I am trying to solve. I have two ISPs into my household. I have Verizon DSL, which I use as my primary connection to the internet. I also just got Time Warner Cable Video Gateway, which is essentially a cable modem which can only connect to twctv.com, so that one can use the TWC TV app. Both modems have their own DHCP server and broadcast on separate SSIDs. I am currently using the ethernet from the Verizon DSL modem and a wireless connection from the TWC cable modem. To connect to the TWC TV app, I have to disconnect my wired connection to Verizon DSL and enable my wireless connection to connect to the TWC wireless network.

Here are two scenarios that I considered. I am unsure of their feasibility or implementation, so that is why I am posting here.

Best case scenario: I would like to combine the two networks into one ethernet connection. I would set up some way in my router or switch so that all connections, except those to TWCTV.com are sent to my Verizon router and only connections to TWCTV.com are sent to the TWC Video Modem.

Other Scenario: I would like to have a wired connection to the Verizon DSL network and I would like to have a wireless connection to my cable modem. These connections would be simultaneous. All connections, except to those to TWCTV.com would be routed through my DSL and those to TWCTV.com would be routed over wireless.

Would any of those scenarios be possible?

Thanks in advance for all your help.

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Can you please provide the OS of either the router that will be load-balancing 'clients' across the modems, or, if you are just using a single computer connected to both gateways, that host? Sounds like the latter but a little unclear. –  pilona Jun 24 '13 at 20:51
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And yes, it is possible. The generic answers are called 'policy routing' and 'multicast default route'. See this Linux example but will wait for confirmation of above before posting an answer. –  pilona Jun 24 '13 at 20:53
    
Your best case scenario can be achieved with an OpenWrt multiwan setup. Your other scenario can easily be achieved on Linux, as noted by pilona. –  James Haigh Jun 25 '13 at 16:44
    
@James: OpenWRT is Linux, and one of the implementations for multiwan is just a multipath route with policy routing, as shown by the bottom of the link above. –  pilona Jun 25 '13 at 20:19
    
@pilona: I know OpenWrt is Linux; I use it. The stock OS of many routers is Linux, so just because a router's OS is Linux doesn't mean to say that such advanced routing is made available to the user. –  James Haigh Jun 26 '13 at 0:03

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