Change WAN IP Address

[mussarat]

We are moving all our self hosted servers from one Datacenter to another, they all have their own WAN IP address which will change on moving, What is the best way to move the servers so that the FQDN resolves to the right IP
There are about 8 standard v 18.0 servers and 1 on the latest ver

 

[NicholasP_3CX]

If you are using a 3CX FQDN you just need to migrate the servers. The DNS updating is taken care of as soon as the new server activates.

 

[mussarat]

so just to confirm we migrate the servers make sure the firewall rules are in place and then 6 hours the DNS will update, if there is a problem how can I access servers without the FQDN not working ie from the internal network - note all these servers have private IP and use NAT done by our firewall

 

[AWS2P]

already changed hoster and It seems to me its more five minutes for DNS to be up to date with the new public IP than 6 hours