We will shortly be changing our leased line provider & I want to be sure that everything is in place to ensure a smooth transition. Could someone please point out what areas I need to consider. It will be a managed router with a new range of external IP Addresses for my external facing servers etc, though these have not yet been assigned.
These are the things that I am aware of so far:
1) NAT in my firewall - add in the new external IPs when known
2) DNS in my AD (2003 Server) - change to the name servers for my new ISP?
3) Domains (e.g. mycompany.co.uk) - change the IP addresses in the A records for my mailserver etc...
I'm not quite sure what I need to change in my DNS, so some help there would be appreciated.
For my domains, can I setup secondary records so that my new IP addresses & my existing IPs are valid?
Is there anything else I need to consider?
Many thanks in advance.