Moving to a new ISP tonight

Hi, we got a new ISP a month ago and it has been running in parallel with our existing ISP on our Cisco firewalls.  I moved all the IPSec VPN tunnels over to the new ISP but the internet, ACLs, NATs etc are all still on the old ISP (when I do a whatismyip.com is still shows the old ISP)

We plan on moving everything over tonight to the new ISP (so that it shows the new IP on whatismyip.com) and all the internet traffic, NAT rules from servers, etc.

What all do I need to do and consider?
Can someone go into details about DNS (AWS and internal on DNS server)?
What else?
Anything I need to do in Active Directory? SMTP server? Spam filters (appriver)?
IIS servers?
Anything else?

Thanks.
dealstrikeAsked:
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Kamal KhaleefaInformation Security SpecialistCommented:
About smtp and published services and websites will you keep your public ip's or you will have new ones?
About dns  if you currently do forwarding to your isp you need to add your new one
Will public ip's change ?
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Kamal KhaleefaInformation Security SpecialistCommented:
If your ips will be the same
Just be sure gateway for internet is your new isp
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dealstrikeAuthor Commented:
No, we are getting rid of ISP1 (our old ISP) completely
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Kamal KhaleefaInformation Security SpecialistCommented:
Then
First about internal dns make sure the forwarding to your new isp or public provider like "4.4.4.4" depend on your current configuration
for all services
External Dns "your domain name". The new ip must be NAT to your external dns
all your services on public dns must be changed to new ip's
For smtp how do you spam filtering if you TMG server  just change nat
After changing all ips on external dns change all nat on firewall from old public ip to the new ones
On external dns be sure that reverse proxy zone changed too to see changes faster on internet
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Kamal KhaleefaInformation Security SpecialistCommented:
And be sure when you do nat
 change traffic from inside to outside using new ips too specially for amtp server
And any webservice you have
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Pete LongTechnical ConsultantCommented:
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David Johnson, CD, MVPOwnerCommented:
you will have to go to your domain registrar and change the NS records to point to your new IP address.. The same goes for any A records that point to your old isp address. Hopefully you were proactive and reduced the TTL time to a short value i.e. 5 minutes.
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