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Accepted
Jeremy Stein
Asked: 2009-12-01 06:58:17 +0800 CST

How can my my batch file determine whether I'm on my work network?

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I have a batch file that runs whenever I log in on my laptop. I only want the batch file to execute when I'm on my employer's network. At home, I'd like the batch file to simply exit.

What's an easy way to detect (from a batch file) whether I'm on a certain network?

networking

4 Answers

  1. Best Answer

    A generic approach to check for specific network characterisics, e.g. a specific IP-Address, aber given server IP or the output of a traceroute. For this to work, it is important to know the differences in the network topologies and exploit them. A more detailed explaination would required some more information on the problem setting.

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  2. I could ping our domain controller and check for an error:

    ping -n 1 servername
if errorlevel 1 exit

    The downside is that I have to wait for a timeout when it doesn't work. I was hoping for something immediate. I'm open to better suggestions.

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  3. I could check whether the default gateway is set for work:

    ipconfig | find "10.1.1.1"
if errorlevel 1 exit
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  4. At a command prompt enter echo %logonserver% and see if your domain computer is returned as the server that you are connected to.

    In fact, here is an even better way, put this in your bat file....

    @echo off 
IF EXIST %logonserver% (
  echo 'On LAN!'
)ELSE (
  echo 'Not on LAN!'
)

    Hope that helps. if you know the authentication server name you can obviously add a conditional equal statement in the if portion to confirm that the server exists, then run the remainder of your batch file. And of course the ELSE portion would simply exit.

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