How do I allow a ping from the first PC to a second one but block a ping from the second PC to the first one?
I created this firewall rule on both Mikrotik routers:
add action=accept chain=forward dst-address=192.168.100.17 protocol=icmp \
src-address=192.168.11.252
add action=accept chain=forward dst-address=192.168.11.252 protocol=icmp \
src-address=192.168.100.17
add action=drop chain=forward
If I turn off the first or second rule, none of the pings work. If I allow both, pinging works on both PCs.