Multiple External IP port on seperate interfaces to one single internal IP.



  • Is it possible to create a single rule for two WAN IP's to port forward into a single internal IP. (No need or want for outgoing 1:1)

    The scenario is that I have 2 MX records (MX1 and MX2) that come into my firewall on separate external IP addresses (different ISP providers) and then forward on to a single clustered internal IP.

    Is there an easy way to make a rule that traffic for both WAN interfaces to these requests on port 25 to the internal IP or do I have to make a rule for each WAN interface separate?



  • No idea's on if this is possible or not?

    If it's not possible, I"m happy just making the separate rules per interface. I'm just curious if there is something obvious I'm missing here in regards to setting one rule for 2 WAN interfaces SNATing to one internal IP from 2 external WAN IPS.

    If it can't be done such is life but I'd like to learn how if it is possible.



  • Yes that's possible. You have to have one rule per WAN, so that's two port forwards (they specify the public IP and that's different on each, hence the requirement).


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