This article will advise how to change your computer's IP address and DNS servers on Windows 8.  This article applies to any version of Windows 8.
If you are using a PC, move the mouse cursor to the bottom or top right corner of the screen and select the cog icon for Settings.
If you are using a tablet, swipe left from the right side of the screen and select Settings. Your computer should now be able to communicate with your network and the Internet using the new settings.. 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). Domain Name Server, termed as DNS in short, are servers with a specialized task of translation (resolution) of humanly memorable domain names and hostnames into the corresponding numeric Internet Protocol (IP) addresses, the second principle Internet name space, used to identify and locate computer systems and resources on the Internet. DNSJump is a freeware utility, which memorizes upto 16 DNS Server IP Address settings and you can choose any of them to work at a given time, with just a single click.
This is a very good piece, I discovered your blog site checking yahoo for a similar content and came to this.
You should never have to change any of these settings again unless you hard reset your router, change the IP settings or reinstall Windows.
Virtual PC is essential for any Network administrators for exploring and testing network issues. I have this issues, my virtualbox clients can’t ping each other but they can ping and telnet to all the routers in GNS3. I installed virtual box and installed linux embedded distribution OS legato is running in it. 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).
They are generally maintained by your ISP’s although there are public DNS server applications like OpenDNS and Google’s Public DNS as well. With so many useful DNS services available today, it sometimes becomes difficult to manually change them as it is also difficult to memorize them all.

I couldnt find to much additional info on this blog post, so it was good to locate this one. Because their IP address is automatically assigned to the computer by the router each time you turn it on, it is possible for this IP address to change if you have more that 1 computer on your LAN. Right click "My Network Places" on your desktop and click "Properties" (or double click "Network Connections" in Control Panel). Now enter the details you just copied down into the boxes and enter an IP address that is outside the DHCP range you specified.
Now check that your internet still works by browsing to a site you have not visited recently. Now that the internet is working, you need to change your port forwarding settings to point to the new IP address of the server. Here I will show you how to make use of VirtualBox host only Ethernet network adapter for communicating between Virtual PC and Host computer. Host-only networking is another networking approach in virtual box network. Here let’s see How to set Static IP to VirtualBox host only network card and ping between Host and Virtual PC.
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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. I will probably end up being returning to check out some other articles that you have another time.
With bridged networking, the virtual machines can communicate internet through a physical Ethernet. 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.
But host only network adapter meant for internal networking and testing however, a physical networking interface need not be present.
To get it working again you have to change the port forwarding rule to the newly assigned DHCP address.
If no nameserver entries are present, the default is to use the name server on the local machine.

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