Changing provider Exchange 2003 and SBS 2003

65 pts.
Tags:
DNS
Exchange 2003
Firewalls
IP addressing
SBS 2003
I am changing provider today and here is my scenario and concerns. My DNS is hosted outside our network (A record-IP 164) then I have a firewall set at 164 and SBS 2003 which has IP 184. For some reason I am concern about my emails when changing IP addresses. I obviously will change the DNS IP to the new IP and the same will applies to my firewall and SBS. Do you see any other changes on IP address that I am missing? Do I need to change anything else for Exchange and Web Access to continue working?
ASKED: July 15, 2008  1:09 PM
UPDATED: July 16, 2008  12:48 AM

Answer Wiki

Thanks. We'll let you know when a new response is added.

If you are assigning everything a static IP address as you had before, I don’t see any reason why the e-mails wouldn’t continue working. Switching to a different ISP is not something most of the users will notice (unless of course you are switching from dial-up to high speed haha).

Rate the importance of the unit when reassigning IP addresses. That is to say, remember to configure the devices to the new network/IP address before full implementation of the ISP switch so that you will be able to access the devices after the switch and won’t have to reset the devices. This will decrease downtime. Just document everything!
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You can go ahead and add a new MX record for the same domain name (I assume that you will be keeping the same domain name) with a higher weight for the new IP address before it is active. Be sure to change the lifetime on the records to a shorter time so it becomes “live” quicker when the new address is active.

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  • Fe
    I was concern that the DNS A record is pointing at the FW not at SBS. Does that make sense?
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  • Fe
    Thank you for your help and support
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  • Fe
    I was concern that the DNS A record is pointing at the FW not at SBS. Does that make sense?
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  • Fe
    Hi, I did not see your last answer and I went and change the DNS and did all the changes on IP address and now I can go online no problem but email is not going in or out the network. I can send email inside the network with no problem, but that’s it. Maybe the DNS will take some time before it takes effect. I noticed that when I changed the IP address on the FW for email I had three options. LAN-Local IP---I did not touch this setting WAN-I change this IP address, default gateway, etc... OPT-The existing settings here reset when I change the WAN IP-It had the WAN IP address and Transparent Mode-Now it shows zero-Do you think this might be causing my problem? Keep in mind that I have two Firewalls one for Internet and one for email. Internet is working fine but email only works internally.
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