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Thu, Feb 19, 2015 11:01 pm

Enabling DNS Logging for Windows Server 2012

I wanted to log DNS queries and responses from all systems using a Windows Server 2012 DNS server, so that I would have DNS logs available for reference in the event of issues related to malware, etc. I also wanted to rotate the log files every night, so that the file size wouldn't grow continually until it reached the maximum 500 MB size I specified for the log file. Instructions for doing so for a Windows Server 2012 system are here. Instructions for doing so on a Microsoft Windows Small Business Server (SBS) are at Enabling DNS Logging on a Windows SBS 2003 Server.

[/network/dns/windows/logging] permanent link

Sat, Nov 22, 2014 12:25 pm

Determing the location of a Microsoft Windows DNS log file from a command prompt

If you need to determine the location of the log file for a Microsoft Windows server functioning as a DNS server from the command line, you can do so through a reg query command.
C:\>reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters /v LogFilePath

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters
    LogFilePath    REG_SZ    d:\logs\dns\dns.log

You can reduce the output displayed to just the line containing the log file location by piping the output of the reg query command into the find command.

C:\>reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters /v LogFilePath | find "LogFilePath"
    LogFilePath    REG_SZ    d:\logs\dns\dns.log

If you wish to see just the log file location and not the other information returned by the reg query command, you can use a FOR /F loop command such as the following:

C:\>for /f "tokens=3" %g in ('reg query "HKLM\SYSTEM\CurrentControlSet\Services\DNS\Parameters" /v LogFilePath ^| find "LogFilePath"') do @echo %g 
d:\logs\dns\dns.log

C:\>

The FOR /F loop breaks up a line of output from the command that is being processed into items, called "tokens" that are separated by space on the lines of output from the command. In this case, I'm only interested in the third token on the line of output, which is the location of the DNS log file. The output that is being processed is the result of piping the output of the reg query command into the find command. Since the pipe symbol, i.e., the vertical bar character |, has a special meaning for the Windows operating system, you need to place an "escape character", which for Windows is the caret symbol, ^, immediately before it. You also need to put the at symbol, @, before the echo command to avoid seeing the echo command itself as output.

If you wish to use a batch file to execute the commands to find the log file location, you need to replace the %g with %%g as shown below.

@echo off
FOR /F "tokens=3" %%G IN ('reg query "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters" /v LogFilePath ^| find "LogFilePath"') DO echo %%G

The registry key and the value to be queried can also be placed in environment variables that can be modified, if you wish to query other registry keys, instead of the one for the DNS log file location, so that it is easier to see what needs to be changed for such other queries.

@echo off

REM Name: queryreg.bat
REM Version: 1.0
REM Created: November 22, 2014
REM Last Modified: November 22, 2014
REM
REM Description: Displays just the value of a registry key from a
REM "reg query regkey /v regvalue" command omitting the additional
REM information that is output by the command

set regkey="HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters"
set regvalue="LogFilePath"

FOR /F "tokens=3" %%G IN ('reg query %regkey% /v LogFilePath ^| find %regvalue%') DO echo %%G

Download: queryreg.bat

[/network/dns/windows/logging] permanent link

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