I see this question get asked a lot on forums, most people never touch the firewall, 'if it's working leave it alone'.
OK lets not run to the comms rack with a laptop and get stuck into the problem, get all your ducks in a row first. Then ring the old ISP make sure you can log a technical call without having to give them a password, (that everyone's forgotten), or the only person who they will talk to left the company five years ago.
Warning: Sometimes you find that if you have used the public IP your ISP gave you on your laptop, that when you plug in the ASA it won't work, (this happens because the router 'caches' the MAC address of the Laptop, and get confused when the ASA uses the same IP). If you have other sites with VPNs to you, they will need changing to point to the new public IP address. Now you've read all the above, you have a better appreciation of what you might break, and how much downtime to expect. Again never assume the outside interface is called 'outside', I've seen all sorts of naming outside, Outside, Public, WAN etc. Now you know the interface name, you know know its physical name, (GigabitEthernet0, Vlan 2, etc.) You have all the information you need to change the IP address, subnet mask and default route. In the ASDM you go to the same sections you did above, select the interface or route, click edit, then make the change.


Before we look at anything else we need to make sure the ASA has connectivity to the Internet, and THE ASA can ping a public ip address (Note: I said the ASA, not something on your network).
If this fails, ensure you can ping your ISP router (default route IP) this should be pretty easy to troubleshoot with the assistance of the ISP. If you have public IP addresses statically mapped to public IP addresses from your old ISP range then these will need to be changed.
To do the same in the ASDM, is a little more convoluted you need to check every NAT rule and see if you have one thats type is 'static' and has an IP address from your old ISP range, then you can change it accordingly. If you have site to site (IPSEC) VPN's then these will have gone down when the public IP address changed.
For remote workers using the older IPSEC VPN client, you will need to send them a new PCF file to import into their VPN client with the new IP address in it, (unless they are pointing at your public DNS name, then you simply need to change the IP address that the DNS name points to). I think I've got most stuff covered, if I've missed something that's caused you problems let me know, and I will update this article accordingly (contact link below).
And that's great until you move offices, or get a newer faster (or cheaper) Internet connection. The ISP always reserves and issues the same IP details to you because you have a mail server or have VPN connections etc).


Your Current Internet Connection: I know you're going to turn this off, but if there's a problem and everything 'goes to hell in a hand cart', you might need to connect back to this one in a hurry, (best not to look like a clown because you deleted all those settings and don't know what they are). Backup: You are only ever as good as your last backup, make sure the ASA is backed up before you start, and backup to TFTP, or via the ASDM NOT by copy pasting the config into Notepad (this tends to hide shared secrets etc). Test The New Internet Connection: I've had many a call from a colleague, that they can't get an ASA working through a new Internet connection.
The outside interface of the ASA is exactly the same as any network connection it needs an IP address, a subnet mask, and a default route (same as default gateway for you Windows types).
Now we need to locate the default route for the 'outside' interface, (or whatever yours is called). You may have covered this in point 5 but now I'm talking about the public IP addresses that are in use but NOT assigned to the outside interface. Or if your ISP handles this, get the information on how you can change your host records to point to the new IP address, (i.e.



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