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Identifying a DHCP server

Here are three quick ways to identify which DHCP server your machine is getting it’s IP address from. This can come in handy when trying to track down rogue DHCP servers that pop up on a network.

In Tiger:

  • Open System Profiler
  • Click on “Network”
  • Select which service you want to see
  • It is listed under “DHCP Server Responses:” next to “Server Identifier”

In Panther and below:

  • In Terminal type “ipconfig getoption en0 server_identifier”
  • Change “en0” to “en1″ if using wireless

You can also wrap it in an AppleScript. This should work on most version of OS X.

[codesyntax lang=”applescript” lines=”no”]
do shell script “ipconfig getoption en0 server_identifier”
set theIP to the result
display dialog “Your DHCP server IP is: ” & theIP
[/codesyntax]

Save it as an application. Great for getting this information from the Terminal-challenged user.

:: Mar.14.2007 :: Applescript, Management, Scripts, System, Terminal :: No Comments »

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