|You don't need a commercial grade router. SOHO equipment is good enough. |
Perhaps I wasn't clear enough in my previous response so I'll try again.
You will need a router between the two subnets that is connected to the two subnets. On that router you would put one, or more, static routes depending on whether or not you needed the traffic flowing in only one direction, or going in both.
Before you configure anything you will want to click on my name above in this response and read my “how-to” guide titled, “Add a second Router to your LAN”
For your scenario, you will want to use "Version 2" where you interconnect your two routers connect "LAN port to WAN port"
Can this be done wirelessly using a router in bridge mode you ask? I don't know for sure having never tried that myself. I avoid wireless whenever possible, especially for interconnecting network appliances. It's too unreliable compared to wired.
Having said that, I can only say, I have my doubts that it's possible with SOHO level equipment. When using a wired connection, you can diffentiate between WAN port and LAN. This isn't possible on any of the SOHO equipment I've worked on when you're talking a wireless connection. If it were me, I'd be reading through the router's manual and going through it's management interface to see if it's possible, but again, I doubt it since separate subnets means having two interfaces that are on different subnets.
Adding a static route isn't a complicated process. A few seconds to search will yield plenty of info on how to add a static route. A few minutes of reading will explain the process and logic behind it. Then you just need to find the place in your router's management interface where you can add a route and then do so and test.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.