Alias through DNS
- From: "DNSer" <jjacob@xxxxxxxxxxxxxxxxxxxx>
- Date: 3 Aug 2006 17:28:50 -0700
I run a shop with W2K3 AD integrated DNS. I also host an Exchange 2003
server.
We have a CISCO Firewall in the network and until recently I used DNS
doctoring (aliasing) to redirect requests from my inside users for the
publicly registered email server In other words, I had a firewall
rule that specified my publicly registered email server (MX), i.e.
mail.mydomain.com, is found at mail.inside.mydomain.com. It worked
great --there were no problems with name resolutions and email. After
maintenance on the firewall, this DNS doctoring stopped working
altogether.
This has become a real annoyance since I have a lot of branch office
and mobile users
who visit the main office and can not access email because the mail
host is named differently on the inside from the public email name.
And without changing settings in their mail client and \ or providing a
"new" address for their OWA, they cannot get to their email.
I've troubleshot the problem with CISCO -- there's no way to recapture
the functionality without changing hardware -- not a very practical
solution. I've thought there may be a way
to do it in DNS with the use of CNAME RR. But I've also heard there
may be problems
using cname references for mail servers.
Does anyone have experience with this type of problem and if so, how
did you resolve it?
Any advice or guidance is greatly appreciated.
DNSer
.
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