I know this has been asked a dozen or more times, but I can't seen to find what I am looking for.
I bought a Flint 2 router for the main network in my apartment, and a Beryl-ax for another room to connect my homelab. I am using the Beryl-ax as a repeater for the Flint2. When I connected the Beryl-ax to the Flint2. I got a subnet conflict. I changed it to a different subnet - 255.255.0.0. the Flint 2 is still 255.255.255.0.
I want to be able to access my server from the 255.255.255.0 subnet to the 255.255.0.0 subnet.
Tailscale, Wireguard, and such are all great options, and I might do that in the end. But I would really like to know how to get the 2 subnets together. for things like Jellyfin on my server to my roku.
Do you need the same subnet access for the 2 routers, right?
It is not to change the subnet mask, but use the correct network mode to make the two routers are under the same network segment.
Beryl AX can use the Extender mode to connect to Flint2, so that they will be under the same subnet.
Bery AX uses the Repeater mode and connects to Flint2, so that they will not be under the same subnet, but Beryl AX can access Flint 2 network, but Flint 2 cannot access Beryl AX.
Sorry for the late reply. Right now I have the BerylAX setup in extender mode. Of course, everything works fine in this setup.
I would like to setup the berylAX in repeater mode, but have certian devices that are on the flint2 to access devices on the BerylAX.
For example, I know I can port forward Jellyfin and it would be fine. However, sometime I use a laptop that is connected to the flint2 - I would like to be able to access devices through that from the flint2 to the BerylAX.
Subnet conflict. Some confusion ... . 255.255.255.0 and 255.255.0.0 are 2 subnet masks. Subnet masks are usually identical within a subnet , subnet is defined by its IP address (the part of the IP address corresponding to the bits with value 1 (all 8 bits in in 255) in the mask). Every device can handle different masks, i.o.w. can see a different part of the IP address as being part of the local network, but mostly it is the same in every device of that subnet.
Local network devices (same IP address network part) is talked to directly (the needed MAC address is found via ARP requests), if both devices are not in the same local network (IP address falls outside the masked part) the packet is directed to the default gateway/router.
The Beryl knows multiple "Network Mode"s. The important ones here are "router" and "extender". ["repeater" in GL.inet naming is not a network mode, but a possible internet or
WAN connection]
(In Network mode "router" there is WAN access via repeater, besides ethernet and tethering and cellular. Only when using Network Mode router.
In Network mode "extender" there is only internet access via repeater, in the GUI.)
In GL.inet the network mode "router" is always using NAT (network address translation) for traffic from LAN to WAN. The answer packet from WAN to LAN will be accepted, but direct access initiated from WAN to LAN is not possible for 2 reasons.
The firewall does not allow it
2.The reverse NAT is not set up, if the connection was not started from the LAN side.
This WAN to LAN can be set manualy with "port forwarding" and/or with "DMZ host" (=all ports at once, to only 1 device in the LAN)