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Setting a Static LAN IP Address:


This document walks you through configuring a "static LAN address", which is important for network stability. This configuration task provides you with insurance against common types of problems that occur when port-forwarding to a server that uses a DHCP address. You will be protected against these types of problems if for example you lose electrical power, or have to reset all the equipment. While this becomes a general-networking issue, we attempt to cover this subject in full detail so you can get the most out of TZO.

IMPORTANT: This document assumes a (Linksys default) router LAN IP address of . In the event you have configured your router's LAN subnet differently, please adjust our examples.

Most Linksys routers operate a DHCP server (internal dynamic IP), set to provide dynamic LAN IPs throughout a certain range. You need a static LAN IP set on your server, but you must also take care to avoid conflict with the router's DHCP server range.

"Safe" IP addresses you can set for your server are through Other addresses are possible, but typically you need 1 LAN IP set static for each PC you want reachable from the Internet.

In this example, it is assumed your server will be set to a static LAN IP of

Safety Check - Verify the IP address you want is available:
It is important to avoid setting two computers to the same IP address - otherwise there will be an address conflict. On a LAN network, you can "ping" an IP address to see if another server is already running at that IP.

1) Click on the Start menu, then Run

2) If your PC is Windows 2000/XP, then In the "Run" window, next to Open: type in the word CMD (see example below). If your PC were Windows 98/ME you would type COMMAND instead.

3) When Command Prompt ("the DOS box") opens, type PING Press ENTER.

If you see the desired message "REQUEST TIMED OUT" then there is no current device in use using this IP (so it is a safe IP to use).

If you get a reply to Ping , something already has that IP address. Try a different IP such as, .202, etc.

4) Close the Command Prompt window by typing "exit" (press Enter), or click the X in the corner.

Setting the Static IP address


1. Click on the Start menu, and then click on the Run option.

2. When the "Run" window appears, type ncpa.cpl into the "Open"

Field as shown below. Press OK.

3. The above step will open a window "Network Connections".

Right click on the Local Area Connection (or Wireless Network Connection) which controls your network connection to the router, and then click Properties from the menu. This will bring up all settings for your PC's network device.

4. After your PC's network device properties are open, you should see a dialog similar to the example image below. Underneath "This connection uses the following items", click once on Internet Protocol (TCP/IP) then press the button "Properties".

5. When configuring a LAN-based PC to run on a "static" LAN IP, some properties that were set by the router now must be set by you.

Inside the " Internet Protocol (TCP/IP) Properties " window opens (see example below), change " Obtain an IP address automatically " to " Use the following IP address ".

Set the options " Use the following IP address " and "Use the following DNS server addresses", as shown in the example screen below.

Values used for this tutorial (your network might differ):

IP address: IP:

Subnet Mask:

Default Gateway:

Preferred DNS server:

6. Click OK then OK or Close - you have configured your PC to use a Static LAN IP! You do not need to reboot Windows.

Additional Steps for Windows 98/ME only

•  Follow above steps 1-5. Some screens may differ slightly.

•  Click on the DNS Configuration tab

•  Near the "Host Name" field, go to Computer , then " DNS Server Search Order "

•  Input the value

•  Click the Add button.

•  Click OK , then click OK once more.

•  Windows will prompt for a restart. Only after the reboot will the new network settings take effect.

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