Source NAT

Masquerade is a commonly used srcnat action when the WAN address is dynamic. The WAN interface name must match your device configuration.

/ip firewall nat add chain=srcnat out-interface=WAN action=masquerade
/ip firewall nat print

Security: verify the WAN interface before adding a rule and back up the current firewall policy.

Practice

In a MikroTik CHR lab, identify LAN and WAN interfaces, add a NAT rule and verify traffic.