Exchange, DNS and Reverse Lookup Records - Need Help
Posted on 2011-02-28
We recently decided to migrate to an MPLS network. To be fair, no vendor names will be mentioned. Lets just call it Splint MPLS. While cutting over to Splints network, rather than use thier IP's, we are using blocks that we recently acquired.
We have 15-20 remote sites, 5-6 of them with Exchange servers. All mail comes in here at the hub site and gets routed. However each exchange server has the ability to send mail from their location. So, they have PTR records set up with thier ISPs to comply with reverse lookups from other mail servers.
When we move to our new network, the ISP will advertise our IP's that WE own. They will be the same ISP at every site and now we will need new PRT records for the new IP addressing at each site. The ISP is telling me they can't do this because we own the IP's, not them. And now it seems we need to get a public DNS server just to get around this.
I need to know if this is correct? Or is there any way to setup DNS / CNAMES / MX records.. to get each site to send mail and work the way we currently do without the need for a PTR record locally at each site? I just don't think there is. I don't want to have to have a public DNS server to worry about if I don't have to.
I can explain this differently if I am not wording this properly. Thank you.