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September 7, 2008 11:28pm pdt
 
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Configuring Reverse DNS for WAN with multiple Exchange Servers

Tags: dns, multiple, exchange, configuring, reverse
I have a network setting with 7 sites in North America.  All of the sites are sharing a connection through a WAN.  Each site has its own Exchange Server and DNS but they are all on the same domain.  All of the mail traffic exits the network from the same interface at Corporate HQ.  Mail to AOL, Comcast and some other sites is getting rejected because Reverse DNS look-up does not match for the originating Exchange servers' FQDN.  

1) Is this a setting that needs to be made on the Corporate HQ DNS server to match all of the Exchange Servers to our external IP address or does our ISP need to make this change on their DNS to match our external IP address?  

2) Is it possible to have a Reverse DNS lookup return correct results for multiple servers?  In other words, can a reverse DNS query hit 123.123.123.123 and have it successfully match server1.domain.local, server2.domain.local, server3.domain.local, etc?

3) Is it possible to have the headers for all of the email contain the same FQDN so that reverse DNS will match the Exchange Server at Corporate HQ?
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Question Stats
Zone: Networking
Question Asked By: fhieber
Solution Provided By: Chris-Dent
Participating Experts: 1
Solution Grade: A
Views: 0
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Rank: Guru

Accepted Solution by Chris-Dent:

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[+][-]Author Comment by fhieber
Author Comment by fhieber:

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[+][-]Expert Comment by Chris-Dent

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Expert Comment by Chris-Dent:

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