To build on the response from @MartinLangmaid and others:
- Your Balance 20 (“B20”) WAN 1 is connected to a Verizon modem (“modem”) (or some other modem device, it does not really matter much which or what).
- The modem assigns IP addresses to its clients, and specifically to the B20.
Procedure to test:
Let’s forget terminology for now, and simply do the following steps and see if that works for you. (I grabbed a local B20 for illustration purposes. It is running 8.0.1, but for these purposes the difference should not matter)
- Open the B20 UI, and look at the dashboard. With one WAN connected it should look something like this:
Note the circled IP address. This is the address of the B20 WAN 1 interface
assigned to it by the modem. Note in particular the third element in the quad (“0
- Click on the “Details” link to the right of the IP address. You should get something like this:
Make a note of the Default Gateway address (192.168.0.1), this is the address of the modem as seen from the router (“modem address”). You’ll need that later.
- Open Network > LAN Network Settings.
For the untagged LAN (or the VLAN your PC will connect to) open the LAN settings:
Set the IP address (and the DHCP IP ranges to a different IP segment from the one assigned on the WAN 1. In this example, set the third quad number to anything different from “0”.
- [Optional - of use under some circumstances] Open Network > Outbound Policy and create a new rule:
For Destination use the modem address noted in 2.
It should now look like this:
That should do it. Access from a LAN connected device (your PC) to https://192.168.0.1 (or whatever the modem address is) should drop you into the LAN-facing UI of the modem.
With your two modems make very sure your to WAN connections are on different address segments. E.g., if both your modems assign addresses in the 18.104.22.168.xxx range, and both WANs report the same gateway addres (e.g., 22.214.171.124.1 in our example) then you have to change the DHCP range of at least one of them. E.g. as in this example from a B380 with three ISPs/modems: Note that the third number in the IP quad as assigned to the router by each modem is distinct from the others.