Blocking IP range in FW4

[Lynx]

I think it should be possible to work it out from here:

Firewall configuration /etc/config/firewall

Seems like a close example is given:

I imagine you can ditch the source MAC and destination IP.

Actually probably just a rule in LuCi can be added:

For entering range I think this may be the only way:

Block IP Range, Block Single IP, from any incoming or outgoing from any Interface

Ranges can be specified in CIDR notation (e.g. 192.168.0.0/16). This means the size of the range must be a power of two. Odd sized ranges could use multiple such rules.