How to prevent access between an ethernet WAN and LAN

My condition is eg:
ether1 ip address: 162.162.162.1 connect to WAN with gateway: 162.162.162.5 and my ether2 ip address: 192.168.168.1 connect to LAN

I did manage to get through the net. The problem is that as LAN i would like to block acess or can’t ping to my WAN ip address(security issue), is it possible.. as i already try to setup the firewall filter rules and drop/reject the WAN address but still unsuccessfully.

Any help would be appreciated.

Thank you

I would add a INPUT firewall rule to DROP access to your MT Out IP.

/ip firewall chain=input dst-address=162.162.162.1 action=drop

Be careful not to use your 192.168.268.1 address as dst-address, or else you won’t be able to login to your MT from your LAN