@ WaxWeazle,
Router should or can be on e.g.192.168.1.1 or 10.10.10.1, or 172.172.172.1
LAN Private LAN address pools are:
IPv6 fe80::e9fb:23a6:2e28:a31c%11 40 bit
IPv4 10.0.0.0 - 10.255.255.255 24 bit
172.16.0.0 - 172.31.255.255 20 bit
192.168.0.0 - 192.168.255.25 16 bit
Choose anyone you like and work from there. But in one Workgroup stay with one same number, so 10 stays with 10 and 172 with 172 and 192 with 192.
You have to sit down and decide about every hard ware that needs an IP address which one you want it to assign but always in the same pool, not outside of it of that pool, otherwise you can’t see each other.
Also use the same gateway, which is in this case 192.168.1.1 and under every IP address a subnet mask of 255.255.255.0
Then the DHCP address pool is from 192.168.1.100 to 192.168.1.150, which is in this case 50 IP addresses
So you connect a Switch or hub directely to the first Router then connect everything that has wired Hardware there and you can cascade a second router if you find that the wires are getting too long elsewhere you want them.
Then you use a cable on the LAN ports from the Switch to the second router or directly on the first router and assign it a STATIC IP adress as high as possible like 192.168.1.148, 149, or 150, you can even put a switch or hub there to divide some hardware if necessary from the second router LAN ports or just on the LAN ports of the second router, e.g. your EX4 NAS or any NAS, or any hardware that needs IP addresses as long as the IP addresses coming from the FIRST ROUTER DHCP pool. Remember 1 DHCP server on your Workgroup, etc etc. All hardware needs to have the same name Workgroupname e.g. Admin, Warehouse, Games, etc where it is assignable, where it is not able to be assigned, leave it to just “Workgroup”. It will still appear in the Lan, but takes a little longer to do so.
PS Make sure your EX4 NAS has the Workgroup set. I have not looked into that, but I assume there is somewhere in the dashboard where you can do that, or if not, it will be just workgroup and it just takes time to appear on the network, also make sure that you have the Gateway IP (in this case 192.168.1.1) address right on every PC, NAS, other HARDware wether static or by DHCP. If not, you cannot see each other on the LAN.