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Mikrotik Firewall: Configure NAT Entries for Internal Servers

You host servers behind your Mikrotik firewall and need to setup NAT entries for them. In this example, we will create a NAT entry for an internal email server.

Solution

  1. Telnet into your Mikrotik device
  2. Enter the following command:
    • ip firewall nat chain=dstnat action=dst-nat to-addresses=ServerIP to-ports=25 protocol=tcp dst-address=ExternalIP dst-port=25
    • NOTE* You must include the dst-address= entry, if you do not include this entry ALL port 25 traffic will be redirected to your internal server! dst-address= specifies the IP address the firewall should listen to for inbound email.

 

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