Monday, September 8, 2008

Useful DNS, DHCP and WINS command-line operations

The commands below are a subset of the complete command list found in Useful command-lines, and are command-line operations for core network services - DNS, WINS and DHCP. Most of these commands are queries, useful for once-off or repeated information gathering for reporting, trending, troubleshooting or diagnostics.

Each command-line can be copied and pasted at the command prompt, if you use a batch file you'll need to reference variables with double-percent (%%).

DNS command-line operations

Query DNS forest-wide partition replica
dsquery * "DC=ForestDNSZones,dc=forestRootDomain

Add a CNAME record to DNS
dnscmd %server% /recordadd %zone% %AliasName% CNAME %HostnameAliasing%

Query zone resource records on a Microsoft DNS server
wmic /namespace:\\root\microsoftdns /node:%server% path MicrosoftDNS_ResourceRecord WHERE ContainerName='%zone_name%'

nslookup with debug information
nslookup -debug %IP%

DSQuery authorised DHCP Servers
Dsquery * "cn=NetServices,cn=Services,cn=Configuration, DC=forestRootDomain" -attr dhcpServers

Enumerate all records from a DNS zone
dnscmd /enumrecords @ /additional /continue > DNS_all.txt

Lookup SRV records from DNS
nslookup -type=srv _ldap._tcp.dc._msdcs.{domainRoot}

DNS Information
for /f %i in ('dsquery server -domain %userdnsdomain% -o rdn') do dnscmd %i /info

DNS Zone Detailed information
dnscmd /zoneinfo %userdnsdomain%

DNS Zones in AD
for /f %i in ('dsquery server -o rdn') do Dsquery * -s %i domainroot -filter (objectCategory=dnsZone)

Enumerate DNS Server Zones
for /f %i in ('dsquery server -o rdn') do dnscmd %i /enumzones

Print DNS Zones
dnscmd DNSServer /zoneprint DNSZone

Add a host record in DNS
dnscmd %dnsserver% /recordadd %zone% %relative_name% A %ip%

Find aging records from an enumerated zone
find /i "aging:" DNS_all.txt > DNS_aging.txt

DNS Scavenging check, based on the output of aging records from dnscmd.exe
cscript DNSScavengeTest.wsf /f:DNS_aging.txt

Query DNS objects from the directory
dsquery * DC=,CN=MicrosoftDNS,cn=System,dc=

Start DNS scavenging
dnsmd /startscavenging

Delete a host record from DNS
dnscmd %server% /recorddelete %zone% @ A %IP%

Determine the DNS suffix search list set through policy for a computer
reg query "\\%Computer%\HKEY_LOCAL_MACHINE\software\policies\microsoft\Windows NT\DNSClient" /v SearchList

Query for the zones hosted on a Microsoft DNS server
wmic /namespace:\\root\microsoftdns /node:%server% path MicrosoftDNS_Zone

Find DNS Forwarder information from dnscmd output
for %b in (DNS*.txt) do @for /f "skip=2 delims=[]" %i in ('"find /i /N "Forwarders:" %b"') do @for /f "skip=2 delims=[]" %m in ('"find /i /N "Command completed successfully." %b"') do @for /f %p in ('set /a %m-%i') do echo tail -%p %b

List primary reverse lookup zones from a DNS server
dnscmd %server% /EnumZones /secondary /reverse

List allowed secondary servers for the specified zone
dnscmd %server /zoneinfo SecondaryServers

DHCP command-line operations

Netsh authorised DHCP Servers
netsh dhcp show server

DHCP server information
netsh dhcp server \\DHCP_SERVER show all

DHCP server dump
netsh dhcp server \\DHCP_SERVER dump > dhcp.txt

Last 50 leases on DHCP servers
for /f %i in (DHCPServers.txt) do echo %i && tail -50 \\%i\c$\WINNT\system32\dhcp\DhcpSrvLog.Tue

Active DHCP leases
For /f %i in (DHCPServers.txt) do for /f “delims=- ” %j in ('"netsh dhcp server \\%i show scope find /i "active""') do netsh dhcp server \\%i scope %j show clientsv5 >> DHCPClients_%i.txt

DHCP clients from all servers
Find /i “255.” DHCPClients_*.txt find /i “255.” > DHCPClientsAll.txt

DHCP Server Active Scope Info
For /f %i in (DHCPServers.txt) do netsh dhcp server \\%i show scope find /i "active" >> DHCPInfo_%i.txt

Find Subnets from DHCP clients
FindSubnets.bat 'Output from Active DHCP leases'

Resolve DHCP clients hostnames
for /f "tokens=1,2,3 delims=," %i in (Output from 'Find Subnets from DHCP clients') do @for /f "tokens=2 delims=: " %m in ('"nslookup %j find /i "Name:""') do echo %m,%j,%k,%i

Find two online PCs per subnet
Echo. > TwoClientsPerSubnet.txt & for /f "tokens=1,2,3,4 delims=, " %i in ('"find /i "pc" 'Output from Resolve DHCP clients hostnames'"') do for /f "tokens=3 skip=1 delims=: " %m in ('"Find /i /c "%l" TwoClientsPerSubnet.txt"') do If %m LEQ 1 for /f %p in ('"ping -n 1 %i find /i /c "(0% loss""') do If %p==1 Echo %i,%j,%k,%l >> TwoClientsPerSubnet.txt

Find unique Subnets
for /f "delims=" %i in (Output from FindSubnets) do @Find /i "%i" UniqueSubnets.txt 1>nul 2>nul & @if ErrorLevel 1 echo %i >> UniqueSubnets.txt

Find DHCP Scopes not in AD
for /f "tokens=1,2" %i in (Output from 'Find Unique Subnets') do @for /f "skip=2 delims==" %m in ('find /i "%j" SubnetMaskShorthand.txt') do @find /i "%i/%m" Output from 'AD Subnet and Site Information' >NUL & @If ErrorLevel 1 for /f "skip=1 tokens=2 delims=:" %p in ('find /i /c "%i %j" Output from 'Find Subnets from formatted output'') do @Echo %i/%m,%p

DHCP Clients Per AD Site
for /f "tokens=1,2,3 delims=/ " %i in (Output from 'AD Subnet and Site Information') do @For /f "skip=2 tokens=1,2 delims==" %m in ('find /i "%j=" SubnetMaskShorthand.txt') do @For /f "skip=1 tokens=2 delims=:" %p in ('find /i /c "%i,%n" Output from 'Find Subnets from DHCP clients') Do @Echo %i/%m,%p,%k

DHCP Servers Per AD Site
for /f "tokens=1,2 delims=/" %i in (SiteClientCounts.txt) do @for %k in ("Output from ‘DHCP Server Active Scope Info’") do @find /i "%i" "%k" >nul & If ErrorLevel 0 if Not ErrorLevel 1 echo %i/%j,%~nk

Total DHCP Scopes
find /i "subnet" "Output from DHCP server information" find /i "subnet"

WINS command-line operations

WINS serer information
Netsh wins server \\WINS_SERVER dump > wins.txt

WINS Statistics
for /f "tokens=1,2 delims=," %i in (WINSServers.txt) do netsh wins server \\%i show statistics >> WINSConfig_%j.txt

WINS Record counts per server
for /f "tokens=1,2 delims=," %i in (WINSServers.txt) do netsh wins server \\%i show reccount %i >> WINSRecordCount.txt

WINS Server Information
for /f "tokens=2 delims=," %i in (WINSServers.txt) do netsh wins server \\%i show info >> WINSConfig_%i.txt

WINS Server Dump
for /f "tokens=2 delims=," %i in (WINSServers.txt) do netsh wins server \\%i dump > WINSConfig_%i.txt

WINS Static Records per Server
netsh wins server \\LocalWINSServer show database servers={} rectype=1

Use WMI to find the WINS entries for DNS-enabled NICs on a list of servers
for /f %i in (servers.txt) do @for /f "skip=1" %m in ('"wmic /node:%i path Win32_NetworkAdapterConfiguration WHERE FullDNSRegistrationEnabled=True get WINSPrimaryServer"') do @echo %i,%m

Set the WINS entry for the specified network
psexec \\%server% netsh interface ip set wins "Local Area Connection" static %WINSIP%

Wayne's World of IT (WWoIT), Copyright 2008 Wayne Martin.


mat g said...

thanks for this as usual a great help. I did find a good method to get the forwarder and ip details out:
for /f "tokens=1,2,3,4* delims= " %i in ('dnscmd /enumzones /forwarder') do @echo %i && dnscmd /zoneinfo %i | find /i "Master"

Laurent Zerirgui said...

I have a little bit improve your script:

for /f "tokens=1,2,3,4* delims= " %%i in ('dnscmd /enumzones /forwarder') DO (
echo %%i >> ConditionalForwardersTemp.txt
dnscmd /zoneinfo %%i | find /i "Master[" >> ConditionalForwardersTemp.txt
findstr /i /v /C:"enume" /C:zone /C:command ConditionalForwardersTemp.txt > ConditionalForwarders.txt
del "ConditionalForwardersTemp.txt"

It shows which zone is corresponding to the conditional forwarders and remove unnecessary information.

Laurent Zerirgui. said...

Windows Troubleshooting-First, allow us to observe some Windows seven update issues associated with update of the SP one. Sometimes, the Windows seven service pack one update fails. The answer to the current drawback mostly depends on what style of error you're receiving. Before doing something specific, you'll plan to clear the matter through 2 generic solutions. Firstly, you'll strive fixing the matter victimisation the Windows' trouble-shooter: click on the beginning orb, choose panel > Troubleshooting and there the Fix issues with Windows Update link. Secondly, you'll strive the System Update Readiness tool for Windows seven. You’ll download the tool from the web site of Microsoft. The code for the update is KB947821. Download the tool compatible along with your system (32-bit or 64-bit). This tool checks your system for inconsistencies that square measure preventive the update method. Windows seven update issues will your time conjointly rise as a result of your browser.

All Posts

printQueue AD objects for 2003 ClusterVirtualCenter Physical to VirtualVirtual 2003 MSCS Cluster in ESX VI3
Finding duplicate DNS recordsCommand-line automation – Echo and macrosCommand-line automation – set
Command-line automation - errorlevels and ifCommand-line automation - find and findstrBuilding blocks of command-line automation - FOR
Useful PowerShell command-line operationsMSCS 2003 Cluster Virtual Server ComponentsServer-side process for simple file access
OpsMgr 2007 performance script - VMware datastores...Enumerating URLs in Internet ExplorerNTLM Trusts between 2003 and NT4
2003 Servers with Hibernation enabledReading Shortcuts with PowerShell and VBSModifying DLL Resources
Automatically mapping printersSimple string encryption with PowerShellUseful NTFS and security command-line operations
Useful Windows Printer command-line operationsUseful Windows MSCS Cluster command-line operation...Useful VMware ESX and VC command-line operations
Useful general command-line operationsUseful DNS, DHCP and WINS command-line operationsUseful Active Directory command-line operations
Useful command-linesCreating secedit templates with PowerShellFixing Permissions with NTFS intra-volume moves
Converting filetime with vbs and PowerShellDifference between bat and cmdReplica Domain for Authentication
Troubleshooting Windows PrintingRenaming a user account in ADOpsMgr 2007 Reports - Sorting, Filtering, Charting...
WMIC XSL CSV output formattingEnumerating File Server ResourcesWMIC Custom Alias and Format
AD site discoveryPassing Parameters between OpsMgr and SSRSAnalyzing Windows Kernel Dumps
Process list with command-line argumentsOpsMgr 2007 Customized Reporting - SQL QueriesPreventing accidental NTFS data moves
FSRM and NTFS Quotas in 2003 R2PowerShell Deleting NTFS Alternate Data StreamsNTFS links - reparse, symbolic, hard, junction
IE Warnings when files are executedPowerShell Low-level keyboard hookCross-forest authentication and GP processing
Deleting Invalid SMS 2003 Distribution PointsCross-forest authentication and site synchronizati...Determining AD attribute replication
AD Security vs Distribution GroupsTroubleshooting cross-forest trust secure channels...RIS cross-domain access
Large SMS Web Reports return Error 500Troubleshooting SMS 2003 MP and SLPRemotely determine physical memory
VMware SDK with PowershellSpinning Excel Pie ChartPoke-Info PowerShell script
Reading web content with PowerShellAutomated Cluster File Security and PurgingManaging printers at the command-line
File System Filters and minifiltersOpsMgr 2007 SSRS Reports using SQL 2005 XMLAccess Based Enumeration in 2003 and MSCS
Find VM snapshots in ESX/VCComparing MSCS/VMware/DFS File & PrintModifying Exchange mailbox permissions
Nested 'for /f' catch-allPowerShell FindFirstFileW bypassing MAX_PATHRunning PowerSell Scripts from ASP.Net
Binary <-> Hex String files with PowershellOpsMgr 2007 Current Performance InstancesImpersonating a user without passwords
Running a process in the secure winlogon desktopShadow an XP Terminal Services sessionFind where a user is logged on from
Active Directory _msdcs DNS zonesUnlocking XP/2003 without passwords2003 Cluster-enabled scheduled tasks
Purging aged files from the filesystemFinding customised ADM templates in ADDomain local security groups for cross-forest secu...
Account Management eventlog auditingVMware cluster/Virtual Center StatisticsRunning scheduled tasks as a non-administrator
Audit Windows 2003 print server usageActive Directory DiagnosticsViewing NTFS information with nfi and diskedit
Performance Tuning for 2003 File ServersChecking ESX/VC VMs for snapshotsShowing non-persistent devices in device manager
Implementing an MSCS 2003 server clusterFinding users on a subnetWMI filter for subnet filtered Group Policy
Testing DNS records for scavengingRefreshing Computer Account AD Group MembershipTesting Network Ports from Windows
Using Recovery Console with RISPAE Boot.ini Switch for DEP or 4GB+ memoryUsing 32-bit COM objects on x64 platforms
Active Directory Organizational Unit (OU) DesignTroubleshooting computer accounts in an Active Dir...260+ character MAX_PATH limitations in filenames
Create or modify a security template for NTFS perm...Find where a user is connecting from through WMISDDL syntax in secedit security templates

About Me

I’ve worked in IT for over 13 years, and I know just about enough to realise that I don’t know very much.