/ip fi fil print where src-address="192.168.10.0/24"
Flags: X - disabled, I - invalid, D - dynamic
0
chain=forward action=drop src-address=192.168.10.0/24 dst-address=192.168.0.0/24 log=no log-prefix=""
The following also seems to work for me, although this was a guess and I can’t find it mentioned anywhere online
/ip fi fil print where src-address in 192.168.8.0/22
Flags: X - disabled, I - invalid, D - dynamic
0
chain=forward action=drop src-address=192.168.10.0/24
dst-address=192.168.0.0/24 log=no log-prefix=""