I am using a 4G router as a WAN gateway and want to connect my TomatoUSB device to it as seamlessly as possible so I select "bridge to LAN". Works ok for a bit but then I think my LAN gets confused as the gateway device has address 192.168.1.1 and the TomatoUSB device is also 192.168.1.1. Is it as simple as setting up different IP addresses and turning off DHCP on the 4G gateway? Do the two devices need to be on a different subnet - 192.168.8.1 as the internal address for the 4G gateway for example. Thanks
There are two basic ways to configure it, depending on your needs. Either way, you are already quite off track as you have found out.
Wireless Access Point :
This mode will use the Tomato router strictly for wireless access to your network and internet. In Access Point mode the router will not perform any traffic control such as QOS or access restrictions. To use this mode you will also disable the Tomato DHCP server and leave the ISP device programmed as the DHCP server.
Tomato WAN = Disabled.
LAN IP address = 192.168.1.2 which needs to be any 192.168.1.x value other than 192.168.1.1 AND ALSO not within the range of the ISP device's DHCP server. Tomato DHCP server Disabled.
If you find the option to assign WAN port to LAN then enable it. Most newer versions do this automatically. The all 5 network ports on the router are the same, and are part of your LAN network switch. Connect to router and to all other devices in any order and to any port you like.
Router / Gateway Mode :
This mode will use the Tomato router as an internet control device and allow traffic control such as QOS and custom access restrictions.
Tomato WAN address = 192.168.1.2 which needs to be any 192.168.1.x value other than 192.168.1.1 Subnet Mask 255.255.255.0 Gateway 192.168.1.1
Tomato LAN address = 10.0.0.1 Subnet mask 255.255.255.0 Static DNS 192.168.1.1 and 18.104.22.168
DHCP Server Enabled range 10.0.0.101 - 10.0.0.199
Connect WAN port of Tomato router to ISP device and then your LAN devices to the 4 LAN ports.