Greetings,
We're in the process of migrating our server to a new IP address block
but we're running into issues where reverse DNS checks are causing some
problems. I will outline in brief here:
* We're moving our email server to a new router with a new IP block
* In order to do this in a gradual manner, we're moving services one
at a time to the new IP block, which entails forwarding traffic from
the new router and new IP block to the old router. This is so we can
test our firewall and NAT rules and ensure all services are working
before making a final switchover.
* This method works for HTTPs services, but for email it's a problem
because the email service sees all traffic as coming from a single
IP (static route from the new router) and breaks reverse DNS lookup
for incoming mail.
Does anybody know of a method whereby we could get around this
limitation? Is reverse DNS lookup essential? Or is there another way?
Thanks,
--
Asai
