+--------------------------+                   +--------------------------+
|  Office A                |                   |  Office B                |
| Technicolor TG784n v3    |                   | (router model not known  |
| (router)     |                   | (router)   |
| (external ip) |  <- powerline ->  | (external ip)  |
|                          |                   |                          |
| DHCP Server:             |                   | DHCP Server:             |
| 192.168.1.*              |                   | 192.168.5.*              |
| Mask:      |                   | Mask:      |
+--------------------------+                   +--------------------------+

I have two distinct spaces, each with it's own router and internet connection. I would like to keep everything as-is but allow computers from 192.168.1.x to be able to talk with computers from network 192.168.5.x.

On top of that both DHCP servers should keep serving each network as they previously were. A new computer that connects to Office B should get the IP 192.168.5.x and access the Internet via the external IP

Is this possible?

(the powerline works as an ethernet cable)

Many thanks.

  • Is this possible? - Sure. Look into connecting the two networks with a site-to-site VPN.
    – joeqwerty
    Oct 8, 2015 at 0:12
  • @joeqwerty thanks for the input. "Is this possible" is point on stupid. It should have read is this possible using my current hardware and then list it. Sorry for wasting your time. Will update with current hardware.
    – Frankie
    Oct 8, 2015 at 1:04

1 Answer 1


With the right devices, this will be easy. Just connect both routers to the powerline and tell them to send traffic to the other network via the interface connected to the powerline (this is called setting a route). If and how this is possible with your specific devices we can't tell.

What happens then is that every computer in Office A knows from the DHCP server that it should send all traffic not destined to the local network to the standard gateway and it's the routers job to make sure the packets take the correct route (to the WAN interface for most traffic and via powerline for the traffic.

And vice versa for Office B, obviously.

  • Your post made perfect sense. Thank you very much. Router on site A supports static routing via telnet. Will query site B to see how that will have to work out. Your answer was direct and very enlightening. Thank you!
    – Frankie
    Oct 8, 2015 at 1:09

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