I have this situation:
The Thomson Gateway TG712 is received from provider, is a phone line/DSL modem, with 4 wired LAN (RJ45) connectors, as well as wireless. It assigns to itself 192.168.1.254, and then assigns 192.168.1.* to machines connected to it via wired or wireless.
One of the LAN ports on the Thomson (which doesn't have a WAN Ethernet port, as it uses a phone connector for that purpose) is connected with the WAN RJ45 port on the Allnet router; the Thomson sees this device as 192.168.1.67 - while the Allnet sees itself as 192.168.0.1, and assigns 192.168.0.* to devices connected to it (the Allnet device is wired router only).
The machines connected to the Thomson network 192.168.1.* can ping each other, and ssh to each other (all the laptops are Ubuntus); likewise, the machines connected to the Allnet network 192.168.0.* can ping and ssh each other. My problem is - I cannot see (ping or ssh) machines on the Allnet network 192.168.0.* (Laptop D or Laptop C) from the Thomson network 192.168.1.* (from, say, Laptop A or Laptop B).
Is it possible to have machines on the Thomson network 192.168.1.* communicate with machines on the Allnet network 192.168.0.* - and if so, how? I read somewhere that what I need is "static routing", but I cannot find how to set that up on the Thomson...