Sunday, October 13, 2013

How to Quickly Add Multiple IP Addresses to Windows Servers

If you have ever added multiple IP addresses to a single Windows server, going through the graphical interface is an incredible pain as each IP must be added manually, each in a new dialog box. Here’s a simple solution.

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Needless to say, this can be incredibly monotonous and time consuming if you are adding more than a few IP addresses. Thankfully, there is a much easier way which allows you to add an entire subnet (or more) in seconds.

Adding an IP Address from the Command Line
Windows includes the “netsh” command which allows you to configure just about any aspect of your network connections. If you view the accepted parameters using “netsh /?” you will be presented with a list of commands each which have their own list of commands (and so on). For the purpose of adding IP addresses, we are interested in this string of parameters:

netsh interface ipv4 add address

Note: For Windows Server 2003/XP and earlier, “ipv4″ should be replaced with just “ip” in the netsh command.

If you view the help information, you can see the full list of accepted parameters but for the most part what you will be interested in is something like this:

netsh interface ipv4 add address “Local Area Connection” 192.168.1.2 255.255.255.0

The above command adds the IP Address 192.168.1.2 (with Subnet Mask 255.255.255.0) to the connection titled “Local Area Network”.

Adding Multiple IP Addresses at Once
When we accompany a netsh command with the FOR /L loop, we can quickly add multiple IP addresses. The syntax for the FOR /L loop looks like this:

FOR /L %variable IN (start,step,end) DO command

So we could easily add every IP address from an entire subnet using this command:

FOR /L %A IN (0,1,255) DO netsh interface ipv4 add address “Local Area Connection” 192.168.1.%A 255.255.255.0

This command takes about 20 seconds to run, where adding the same number of IP addresses manually would take significantly longer.

A Quick Demonstration
Here is the initial configuration on our network adapter:

ipconfig /all

Now run netsh from within a FOR /L loop to add IP’s 192.168.1.10-20 to this adapter:

FOR /L %A IN (10,1,20) DO netsh interface ipv4 add address “Local Area Connection” 192.168.1.%A 255.255.255.0

After the above command is run, viewing the IP Configuration of the adapter now shows:

====================
# Add IP
netsh int ipv4 add address name="Local Area Connection 1" addr=10.114.1.35
mask=255.255.255.240 skipassource=true
Here are a couple of other commands that are nice to know:
# List ip addresses
netsh int ipv4 show ipaddresses level=verbose

# Delete IP
netsh int ipv4 delete address "Local Area Connection 1" 10.114.1.35

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To Add IP Addresses to Your Dedicated Windows 2003 Server
Log in to Remote Desktop.

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Go to Control Panel->Network Connections->Local Area Connection.
Right-click on Properties.
Select Internet Protocol (TCP/IP).
Click Properties.
Click Advanced.
Click Add and add the new IP, with 255.255.255.0 as the subnet mask.

To Add IP Addresses to Your Dedicated Windows 2008 Server
============\

Log into your server via Remote Desktop.

Open the server's Start menu and select Network.
Double-click on the Network and Sharing Center icon.
Click on the Change Adapter Settings link on the left.
Right click on the icon representing your server's network card and select Properties from the menu that appears.
Select Internet Protocol Version 4 (TCP/IPv4) and click the Properties button.
Click the Advanced button.
Click the Add button under the IP addresses section of the IP Settings tab.
Enter the IP address and subnet mask 255.255.255.0 and click the Add button.
Click the OK button to close the Advanced TCP/IP Settings window.
Click the OK button to close the Internet Protocol Version 4 (TCP/IPv4) Properties window.
Click the Close button to close out of the Local Area Connection Properties window.

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