Re: False r-DNS with Cisco router, 3 IPs on one Exchange box
Hi, let me understand your problem.
You have one physical email-server (LAN .220) which needs to look like three different servers (.148, .149, .150) from three different domains to your ISP?
This would mean the router has to check the domain in the emails sent to figure out which outbound IP to use. That is not possible afaik.
So you have to look for another solution. You could setup three mail servers in your LAN with one static NAT entry for each box. The router could then replace the LAN IP with the proper WAN IP and you should have no problem. Or you could use three different IP addresses on your mail server for the same purpose. I doubt that this is easily done.
The other - maybe most simple - option is to use one WAN IP for all three domains. Have one static NAT entry (f.e. .150) and let DNS point to that IP for all three domains. This should solve the r-DNS problems you are facing.
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