ISP changing for client

I have a client who is changing their ISP in a few weeks, they are a midsize company and have about 60 employees.

They currently host their web-server, AS2 connection, Exchange server, RDP sessions, and their application on 2 local servers.

If they change their ISP then their static WAN IP address will change, what do I need to do in preparation for the ISP switch?

Will all the information about their port forward and their website be retained by the router or will there need to be changes in the router settings.

What about their DNS information and name server information that is hosted by godaddy, will this information need to be updated as well? I am assuming it will need to be updated.

Please let me know of anything I need to be prepared for before they make this change.

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KwoofConnect With a Mentor Commented:
DNS will need to updated when the new service is ready and connected...but I ALWAYS plan for overlap.

A dual WAN router (Cisco RV042) is a low cost, easy way to support a changeover during the overlap time.  Move your router setting to this router.  The added benefit is after the move...get a secondary internet service (even a low cost, low bandwidth service) to be your internet backup.  All ISPs for my clients have had outages and the secondary internet service keeps them operational.  Otherwise your internet blackout can happen at bad times for the client and cause headaches for you.  with a dual WAN router, unless BOTH internet services go may be the only one to know about one going down.
Aaron TomoskyConnect With a Mentor Technology ConsultantCommented:
Unless they only have a single ip, all the forwarding rules are probably tied to wan ip addresses that are going away. If your router is a sonicwall, you don't have to remake the rules, just change the address objects to the new external ips.

What type of router do you have?

This may be a good time to clean house and stop hosting the web server at least out of the office.
arnoldConnect With a Mentor Commented:
First thing you should do is update their DNS records reducing the TTL on the records to help speed up the transition.
Will they get the new ISP in before the old one disconnects such that there will be sometime for an overlap?
The router/port forwarding settings will depend on the router and whether it is tied to the current external IP or it is general WAN interface port 25 to exchange.
If the two connection will overlap and if the existing router or the new ISP provided router can support two WAN connections, it might be worth while to combine the two connection even for a short amount of time.
Presumably all LAN systems are using NATed IPs such that all changes/adjustments will be limited to the firewall/router.
TristanHowlandAuthor Commented:
Thanks for everyone's input. I have finally got back into communication with the client.

The website that is being hosted on their server is for the AS2 connection for EDI transmission so it will need to stay hosted on their webserver.

The current firewall they are using is hosted by Broadview the current ISP they are replacing. They will have both the old and new ISP running at the same time.

I am currently unsure as to what brand and model of router they are currently using. The router is unfortunately not sonicwall, so the rules will have to be changed by there network personal. I am just the middle man helping this company make sure they have all there ducks in a row before they make the switch.

I agree completely with the statement that both connections should overlap to make sure that there isn't any disruption in day to day business operations.

I am currently compiling a list of specific questions to ask based off everyone's suggestions. Please feel free to add as much to this topic as you would like.

The idea of having a dual WAN router is great idea to make sure that they stay up 100% of the time even after the move has been completed.

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