Tuesday, January 29, 2013

Network tracing (packet sniffing) built-in to Windows 7,8, Server 2008r2 and Server 2012

I was hunting for some information and came across this post on a blog on TechNet, by YongRhee at Microsoft. I am copying his post here because it such a great idea to share.

Applies to:

Windows Server 2012

Windows 8

Windows Server 2008 R2

Windows 7

In Windows Server’s, if you wanted to capture network packets (for those coming from a Unix background, Packet sniffer or protocol analyzer, or TCPDump), you would have to install an add-on such as Network Monitor (Netmon) or Wireshark (used to be known as Ethereal). In order to install these products, you would have to go thru a change control process.

Starting with Windows 7 and Windows Server 2008 R2, network capture has been built-in and native to the Windows O.S.

Start, CMD (Run as admin)

Type “Netsh trace start scenario=NetConnection capture=yes report=yes persistent=no maxsize=1024 correlation=yes traceFile=C:\Logs\NetTrace.etl” without the quotation marks and then press Enter.

Note: Details of all the options are available in the links to more information.

Note 2: You always want to take network traces from both sides (sending and receiving).

Reproduce the issue.

Open a second CMD (Run as admin)

When you have the repro, to make the network trace with a ‘marker’ that you are done.

Type “ping 127.0.0.1” without the quotation marks and then press Enter.

To stop the network capture

Type “netsh trace stop” without the quotation marks and then press Enter.

Once you have the nettrace.etl file, you could copy it off the server to your Windows client.

In your Windows client, you would use Microsoft Network Monitor 3.4 to analyze the network packets.

More information:

Scenarios
Troubleshoots what type of related issues?

AddressAcquisition
address acquisition

DirectAccess
DirectAccess

FileSharing
common file and printer sharing problems

InternetClient
Diagnose web connectivity

InternetServer
server-side web connectivity

L2SEC
layer 2 authentication

LAN
wired LAN

Layer2
layer 2 connectivity

NDIS
network adapter

NetConnection
network connections

RPC
RPC framework

WCN
Windows Connect Now

WFP-IPsec
Windows Filtering Platform and IPsec

WLAN
wireless LAN

Network Tracing in Windows 7
http://technet.microsoft.com/en-us/library/ee918726(v=ws.10).aspx

Network Tracing in Windows 7 (Windows)
http://msdn.microsoft.com/en-us/library/windows/desktop/dd569136(v=vs.85).aspx

Netsh Commands for Trace
http://technet.microsoft.com/en-us/library/dd878498(v=WS.10).aspx

Netsh Commands for Network Trace in Windows Server 2008 R2 and Windows 7
http://technet.microsoft.com/en-us/library/dd878517(v=WS.10).aspx

Event Tracing for Windows and Network Monitor
http://blogs.technet.com/b/netmon/archive/2009/05/13/event-tracing-for-windows-and-network-monitor.aspx

For those administrators that want to learn more and their company has a Premier contract. There is a workshop available called “Netmon for Enterprise Troubleshooting”. Please contact your Technical Account Manager (T.A.M.) about availability in your neck of the woods.

Microsoft Services - Premier Support Proactive Services - Proactive Education

Link to his original Post