Solved Getting New IP from ISP

Microsoft Microsoft windows server 2008...
October 24, 2012 at 16:58:29
Specs: Swerver 2003, Xeon
What do I need to do on our Small Business network to switch the IP over to the new one? Any preparation necessary? How do I reconfigure Server 03 to the new IP?

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#1
October 24, 2012 at 18:13:58
✔ Best Answer
The steps that you will need to take depends a LOT on your network and server configuration.

Here are some, but not all, of the items that you will want to consider.

* Reconfigure your firewall/router for the new ISP and IP block. This would be done at the time of the cutover.
* Ensure any one-to-one NAT entries are changed. This would also be done at the time of the cutover.
* Backup the current config to ensure that if you need to restore the old service in a hurry, or if something goes terribly wrong, you are able to do so with a simply config restore. This should be done BEFORE the cutover.
* Add or modify DNS records at your DNS/Hosting provider. Best practice is to add new records for the new IP block, leaving the old ones in place until AFTER the switch has been made and allowed to be tested for a week or so. This should be done no less than 48 hours before the cutover to allow time for the new DNS information to propagate.
* Add an MX record to ensure uninterrupted mail flow. (Min 48 hours prior to cutover) You can have multiple MX records. I would recommend making the new one have the higher priority (lower record number) so that mail tries to hit the new IP first, then rolls to the current IP. It is more changes before the cutover, but easier to remove the old MX after.
* You will most likely also need to create an rDNS record with your new ISP to allow for mail flow to some external locations.
* Schedule the TTU of the new circuit (if T1) or installation and testing (if broadband) about a week before the actual cutover date. This allows time for testing of the circuit/connection and repairs if any are needed. Some ISPs will try to talk you into doing both on the same day. DO NOT allow this as it will give you no fallback if there are issues.
* Ensure everything is ready to be switched over before the actual cutover time. This includes making sure that the SmartJack (if T1) has been extended and the ISP's router is in place, or other equipment is installed and ready for you to just swap the Ethernet cable from your current ISP's equipment to the new ISP's equipment.

Again, this is not meant to be an exhaustive list, but as you can see, there are a lot of different aspects that have to be verified and possibly changed before the actual ISP cutover.

Let me know if you have any questions or need more help.

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IT Desktop & Network Consultant - MOS Master Certified, MCP, MCSA, MCITP - Windows 7, CCNA Certificate Pending, A+, Network +

::geek::


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#2
October 30, 2012 at 08:18:47
This is a question best addressed by your new ISP. They should have all the answers and if they don't you need to be concerned about this new service.

Odds are you don't have to change anything but what is listed in the forwarders for your local dns server. Even if you don't change that internet name resolution will still work.
Most likely you have a dynamic ip on the router which will change automatically with the new installation.
Assuming you are running Exchange on your SBS, the new ISP will automatically update the mx record for your domain name.

Answers are only as good as the information you provide.
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