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You'll be using the ping command to check that your computers can communicate with each other..

NOTE! You will not be able to ping your ISP or any Internet address from your Client computers until you install the MMR software. This is because they are on separate subnets and require the MMR software to route (or move) data between the subnets.

To use ping, go to the Windows Start button, choose Programs, then MSDOS Prompt
When you get the C: prompt, type ping  
If everything is ok, you should get the following response (or something similar):

Pinging with 32 bytes of data

Reply from bytes=32 time<10ms TTL=32

Reply from bytes=32 time<10ms TTL=32
Reply from bytes=32 time<10ms TTL=32
Reply from bytes=32 time<10ms TTL=32

This means that TCP/IP is working on the MMR computer that you are typing on. is a special address that "loops back" to the machine you are pinging from.   You can also type ping localhost and receive a similar response, since localhost and mean the same thing.

If things aren't ok, you'll get something like:

Pinging with 32 bytes of data

Request timed out.

Request timed out.
Request timed out.
Request timed out.

Better try the troubleshooting tips.

If the above pinged ok, next type ping [yourISPIP] where [yourISPIP] is the IP address assigned to you by your ISP.  You should get the proper "Reply from..." response.

If you don't know your assigned IP address, use the winipcfg command to find out.  An example winipcfg screen is shown below (you'll have to click on the "More Info" button on the opening Control Panel to get this view).  Your IP address is next to IP Address in the Ethernet Adapter Information section.

Example winipcfg screen

NOTE: If you use a Dialup Modem or other method that is not always connected, be sure to bring up the connection to your ISP first before attempting to find your IP address.  Note that dialup modem users will find the IP address under the PPP adapter properties.

If all of that is ok, you can ping your Network adapters.  They will have IP addresses of, and  If you are setting up the MMR for three network types, you'll also need to ping the third network adapter at

Assuming all the MMR computer pings are fine, you should now go to your Client computers and try to ping the corresponding Network adapter on the MMR computer.  You'll be able to ping only,, or, from each computer, depending on which network your Client is on.

If all the pings check out, your local network is running ok with TCP/IP.  Good job!

Time to install the MMR routing software. Earthweb HardwareCentral earthwebdeveloper CrossNodes Datamation

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