Simplest Way to configure Internal DNS to resolve External hostname for mail host instead of Private IP
Posted on 2007-11-19
Am looking for a solution or way to setup an internal DNS resolver so our private internal LAN clients can connect to MAILHOST over its resolved hostname.
We have DHCP running on WIN 2003 Server that has private IP. Secondary NIC is free and we have a spare global IP.Currently PAT and NAT is done on each public facing IP translating to private internal.
Currently we are connecting over its private internal address and port forwarding out to our public and this is fine for the majority but of course the laptops as soon as offsite require their SMTP / POP details to be altered and again on arrival back at work.
Idea being mailhost.whoever.com resolves externally by our external DNS allowing smtp.whoever.com to be used and pop.whoever.com to be used in the clients.
And on the LAN side an internal DNS JUST for internal clients (to ensure that mailhost.whoever.com is accessible and smtp.whoever.com + pop.whoever.com are usuable in the LAN nodes email client config.
i believe this is called split horizon dns ? however we really only want the lookups done for our mail host not every http lookup.
Ideally if our Router supported NAT loopback we would roll with that. but as murphys law dictates ..it doesnt. and so im trying to establish a bandwidth friendly alternative.
Any suggestions guys / girls ?