DNS blocks access to domain

  • Thread starter Thread starter Beach
  • Start date Start date
B

Beach

I have a domain, www.example.com. Email is hosted by a
third party at mail.example.com. Active Directory is
running as well as DNS. When DNS was turned on clients
could no longer access mail.example.com. Outlook must be
configured with the IP which is a pain because it has a
tendency to change. How can I get around this?
 
Beach says...
I have a domain, www.example.com. Email is hosted by a
third party at mail.example.com. Active Directory is
running as well as DNS. When DNS was turned on clients
could no longer access mail.example.com. Outlook must be
configured with the IP which is a pain because it has a
tendency to change. How can I get around this?
Click to expand...
Hello Beach,

you are able to configure the a A-Record for mail in your zone example.com.
There you can set the IP centrally. However if it's changing at your ISP you
have to change that on your DNS-Server as well.
Another option would be if your email-server at your ISP is available as
another name (which always points to the IP of your server) as well. That might
be possible if your provider is hosting another companies email system on the
same server. If that's the case you might be able to configure a CNAME Record
to the other DNS-Name of your server, and it's kind of dynamic.

Gruesse - Sincerely,

Ulf B. Simon-Weidner
 
In Beach <[email protected]> posted a question
Then Kevin replied below:
: I have a domain, www.example.com. Email is hosted by a
: third party at mail.example.com. Active Directory is
: running as well as DNS. When DNS was turned on clients
: could no longer access mail.example.com. Outlook must be
: configured with the IP which is a pain because it has a
: tendency to change. How can I get around this?

In Your example.com forward lookup zone create a Delegation named 'mail'
give that delegation the names and IP addresses of the Authoritative DNS
servers on the internet.
That will keep you in sync at most times, the only time you won't be is when
the address has changed and you have the old IP in cache, this will only be
until TTL runs out on the cached record. These TTS on this type of record is
usually 15 minutes or less. had you given the actual domain name I could
have given you step by step what to put in for the delegation.
 
Back
Top