I'm trying to setup this router with my IP range 192.168.100.1 to 192.168.101.254 but if I try to enter a subnet mask other than 255.255.255.0 I get the error - Invalid subnet mask. It should be 255 for given class of IP address at 255.255.xxx.0.
Every other device on my network allows that subnet mask, why not this router, it's stopping access from my 192.168.101.x devices.
