netstat tips and tricks

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Netstat tips and tricks for WindowsServer admins

Date: November 12th, 2010 Author: Rick VanoverCategory : ServersTags: Fully Qualified Domain Name, Parameter, Administrator, Microsoft Windows Server,Microsoft Windows, Servers, Operating Systems, Software, Hardware

Netstat is a command that some Windows Server admins use every day, while others only use it when there is a problem. I fall into the latter category; I use netstat as a diagnosis tool whensomething has gone awry, or when I am trying to track something down.

The 10 parameters to the Windows netstat command can display scores of additional informationfor troubleshooting or everyday use. The most common iteration of netstat is to use the -aparameter, which displays all connections and listening ports. However, netstat displays usefulinformation even without parameters. Here are some pointers on using the netstat command:

Fully qualified domain name: The -f parameter will display the fully qualified domain name(FQDN) of the foreign address in the netstat display. This will resolve names internally andexternally if possible. Figure A shows the FQDN resolution within netstat .

Figure A

etstat tips and tricks for Windows Server admins | Servers and Storage... http://blogs.techrepublic.com.com/datacenter/?p=3371&tag=nl.e040

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What process is running on the open port: Tracking down which process identifier (PID)has a port open is quite easy when netstat is run with the -a -n -o combination of parameters.Read my Windows Server 2008 tip on this sequence of commands, and see it in action in FigureB.

Figure B


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You can take this one step further with the implementation of friendly names for each process with the -b netstat parameter. This parameter requires administrative permissions and is shown inFigure C.

Figure C


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Note that the remote addresses pointing to the 192.168.1.220:3261 address are the Windows iSCSIinitiator service and display differently than the other services listed.

Display routing table: If you need to determine why one system has a different experience thananother on the same network, netstat can display a route of the current system with the -rparameter. Figure D shows this in use (note the persistent routes section that would display any static routes added to the Windows Server).

Figure D


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These four netstat commands can greatly add to the troubleshooting efforts for Windowsadministrators. How else do you use netstat ? Share your tips in the discussion.

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Rick Vanover (MCITP, MCSA, VCP, vExpert) is an IT Infrastructure Manager for a financial services organization in Columbus, Ohio. Rick has years of IT experience and

focuses on virtualization, Windows-based server administration, and systemhardware. You can catch Rick on Twitter and read his full profile and full blogger

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