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Add Additional IPs to a Windows Server 2003 OS

Dedicated Servers come with one IP address. It is possible to order additional IP addresses through the 1&1 Control Panel. When ordering additional IP addresses, 1&1 ensures that the IP is set to route correctly to your individual server however it is still necessary to add this IP address to the operating system to ensure the server knows which additional IPs are available to use.

For help on how to order additional IP addresses from the 1&1 Control Panel, please reference How do I order additional IP addresses for a dedicated server?To add additional IPs that you've ordered to your server, you will first need to log into the server via Remote Desktop. Even if you have Plesk, you will still need to add the IPs via Remote Desktop.For help on how to connect to your server via Remote Desktop, see How do I log in to my Windows Server via Remote Desktop?

Step 1
Once logged into the server via Remote Desktop, click Start My Computer03ipAdd1.png
Step 2
Double-click the C: drive.

03ipAdd2.png Double-click the Install folder.

03ipAdd3.png Double-click the IPConfig.exe application.

Step 3
You will likely receive an error message that states: No interface was found with a static IP address Configuration.
Are you using DHCP?
This program can only be used with a static IP configurations.
Click the OK button and go to the next step.

If you do not receive this message, skip to Step 13

Step 4
The IPConfig program opens anyhow but click the Quit button for now.

Step 5
Now click Start Control Panel Network Connections Local Area Connection03ipAdd7.png
Step 6
A new window appears and with the Local Area Connection Status. Click the Properties button.

Step 7
Find and click the Internet Protocol (TCP/IP) selection and click the Properties button. (Please Note: Do NOT uncheck the box!)

Step 8
Click the radio button for Use the following IP address:03ipAdd10.png
Step 9
Next, we will need to find the current IP address and other network configuration in order to enter this same configuration manually. Click Start Run03ipAdd11.png In the Run window, type cmd and click the OK button.

03ipAdd12.png Type ipconfig /all and press ENTER03ipAdd13.png Find the section of the output for Local Area Connection. Here you will find the current network configuration that we will use to set the same configuration manually.

Step 10
Using the output from the ipconfig /all command, enter the respective data manually into the Internet Protocol (TCP/IP) Properties window except for the subnet mask:

Subnet mask: Enter as the subnet mask. The correct subnet mask is actually but Windows Server 2003 does not accept this subnet mask. We will fix this later.

When you have entered all fields and double-checked the entries, click the OK button.

Step 11
You may receive a warning about the default gateway and subnet mask. Click the Yes button. We will fix this later.

Step 12
Back on the Local Area Connection Properties window, click the Close button. The server will now apply the settings we have just made and set the IP as static instead of dynamic.

03ipAdd17.png It is common for the server to hang or even drop the connection for a short time. This is normal, just be patient until the connection is re-established.03ipAdd18.png
Step 13
When the Remote Desktop session begins responding again, open the IPConfig program as we did earlier and click on the IP Config tab.

Step 14
Enter one of the unadded IPs into the test box and click the Add button.

03ipAdd20.png You should see the IP added to the list. Repeat this step for every additional IP that has yet to be added.

Step 15
When you are finished adding all of your IPs, if you see an IP with a subnet mask other than, select the IP with the incorrect subnet mask and click the Remove button. We are only removing the IP to then add it again with the correct subnet mask. Removing the IP in the IPConfig application will NOT cause your connection to drop!If all subnet masks are already, skip to step 17!

03ipAdd22.png For the confirmation window that appears, click the Yes button to remove this IP.

03ipAdd23.png You are informed the IP will be removed with next reboot. Click the OK button.

Step 16
Make sure the IP that was just removed for having the incorrect subnet mask is still entered in the text box and now click the Add button. This will re-add the IP with the correct subnet mask now.

03ipAdd25.png Click OK to the message that The new address will be available after the next reboot03ipAdd26.png The IPConfig application now re-adds this IP with correct subnet mask.

Step 17
Close the IPConfig application.03ipAdd28.png
Step 18
Now you will have to reboot the machine to apply these changes. Hold both the Ctrl + Alt buttons and press the End button once to open the Window Securtiy window. Then click the Shut Down button.

Step 19
From the drop-down box, select Restart and click the OK button.

Step 20
After your server reboots, the new IP addresses should be functional. If the IPs do not ping, check the external firewall rules in the 1&1 Control Panel. You should also check any software firewalls on your server as well as the IPSec Service to make sure intended traffic is not being blocked.