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Swapping Exchange IP addresses

Posted on 2016-08-23
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Last Modified: 2016-10-13
I have an Exchange 2003 server which I am migrating to Exchange 2007.  I have built the 2007 server and it is working correctly.  I have moved a few mailboxes and email is flowing correctly.

My plan now is to swap the IP addresses on both Exchange servers, so that the new Exchange 2007 server has the old Exchange 2003 server IP.  I will then check that DNS is correct.  Once this is done, then I will migrate the rest of the mailboxes and eventually decommission the 2003 server.

Does anybody know if this should be OK to do or is there anything I need to consider beforehand?  

I want to change the IP's so that I don't have to make any config changes to my email gateway, routing, firewall rules or public DNS settings.
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Question by:Member_2_7964986
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-MAS earned 500 total points
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Hi,
I suggest don't do it now.
Plan a weekend and move few mailboxes and test the mail flow.
I hope you already configured routing group connector.
If not create one and test mailflow.
New-RoutingGroupConnector -Name "RGC 2003-2007" -SourceTransportServers "exchange2007server.domain.local" -TargetTransportServers "exchange2003server.domain.local" -Cost 100 -Bidirectional $true

Open in new window


Check the connector created successfully
Get-RoutingGroupConnector

Open in new window

If working properly move all mailboxes.
once all mailboxes moved shutdown the server for 1 day and monitor.
If no errors decommission the Exchange 2003 server.
http://www.msexchange.org/articles-tutorials/exchange-server-2007/migration-deployment/removing-last-exchange-2003-server-exchange-2007-part4.html

After uninstalling exchange2003 if you want you can add IP of Exchange2003 as an additional IP in   Exchange server2007.

Thanks
MAS
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by:Member_2_7964986
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Thanks MAS.

I have already configured routing group connector and tested mailflow and all is working well. I have moved a few lightly used mailboxes and no issues so far.

But really I want to change the IP before moving the rest of the mailboxes.  Maybe what you are suggesting is best practice, but I am wondering if there are any concerns/issues doing it the way I am proposing?
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by:-MAS
-MAS earned 500 total points
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Hi,
It is not recommended to swap the IPs as you suggested which will create issues for you.
I have suggested you the best way.
If you are forced to do so please change IP and ensure all the DNS entries are correct.
http://www.zerohoursleep.com/2010/01/5-things-to-consider-when-changing-the-ip-of-an-exchange-server/

Thanks
MAS
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