I am prepping for an ISP switch, and am wondering if it is possible to have a seamless switch.
Lets say I have an internal host, 192.168.0.10, that is behind CurrentFirewall that handles CurrentISP's range of 184.108.40.206/28. The firewall is configured to pass 220.127.116.11 to internal host 192.168.0.10. Now NewFirewall handles address range 18.104.22.168/27 from NewISP and is configured to pass 22.214.171.124 to 192.168.0.10. So the big question is once DNS is switched, if a client is still resolving the old public IP of 126.96.36.199, will the inside host be able to handle said clients requests?