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Discover: * Data Center Knowledge * InformationWeek * Network Computing * Dark Reading * No Jitter * AFCOM * More Menu Log In or Register * Career Development * Cloud Computing and Edge Computing * Compute Engines * Data Analytics and Data Management * End User Platforms * How To...? * IT Operations and Management * Software Development * Security * Storage * Sustainability * Industry Perspectives * Buyers Guides * Top 10 Reports * Tech Insights * Videos * Resources * Technology Provider * Business Resources * Newsletter Preference * Advertise * About Us * Privacy Policy * Terms of Service * Cookie Policy * Search * Log In * Register * NEWSLETTER SIGN-UP Recent Recent Cisco Duo's Multifactor Authentication Service Breached Apr 15, 2024 Big Tech’s Call For Light Touch on AI Falls Flat With Enforcers Apr 12, 2024 -------------------------------------------------------------------------------- Barak Turovsky Analyzes AI’s Natural Language Processing Revolution Apr 12, 2024 Top IT Certifications for a Career in Finance Apr 12, 2024 Intelligent Meeting Rooms: How AI Is Reshaping Meeting Room Experiences – and Raising New Issues Apr 11, 2024 Featured White House Calls for Adoption of Memory-Safe Programming Languages to Prevent Cyber-Attacks Mar 06, 2024 When You Should (And Shouldn’t) Rely on AI Tools Feb 29, 2024 AWS Follows Google Cloud in Ending Cloud Switching Costs Mar 06, 2024 IT Workers Support DEI Programs, Despite Broader Backlash Mar 01, 2024 Technical Explainer End-User Platforms>Windows 7/8 CONFIGURING DHCP AND WDS Rhonda Layfield 1 | Nov 20, 2008 Save During a WDS client's boot process, the normal DHCP traffic occurs. The client broadcasts for an IP address to port UDP 67. Traditionally, only DHCP listened on port UDP 67, but now WDS also listens on port UDP 67 (more on this in a second). When the DHCP server hears the request, it makes an offer. The offer contains an IP address, subnet mask, and any DHCP options you might have set. The client then requests that the DHCP server assign the offerred IP address to the client’s MAC address. Lastly, an acknowledgment is broadcast by the DHCP server that for the next eight days (if you keep the defaults) the offerred IP address is assigned to the client. But wait it’s not done—and this is where it gets interesting from a WDS perspective. The client sends out that first broadcast packet again (technically it’s called a discover packet). The DHCP server responds with another offer, but this offer is used to find the WDS server. So what happens when you have WDS and DHCP running on the same server? They can’t both listen on port UDP 67 right? Let’s look at the three different scenarios for configuring DHCP to help clients find the WDS server. Related: Using WDS with Windows Server 2008 Scenario 1: WDS and DHCP are running on different servers but on the same subnet so broadcasts are not a problem: As long as the client deploying an image from the WDS server and the WDS server are on the same subnet and different servers, everything works fine with no DHCP options configured. Scenario 2: WDS and DHCP running on different servers that are on different subnets (broadcasting would be problematic because most enviornments don’t allow broadcast traffic to cross subnets: for the WDS client to find the WDS server you’ll need to configure two DHCP options—option 66 and option 67. Option 66 is the Boot Server Host Name. In the string value of this option type the name or IP address of the WDS server (I like IP address—no name resolution issues.) Option 67 is the Bootfile Name, and the string value should contain the name of the file you want your clients to boot. For 32-bit clients use boot\x86\pxeboot.com, and for 64-bit clients use boot\x64\pxeboot.com. Scenario 3: WDS and DHCP are installed on the same server: You must tell WDS not to listen on port UDP 67, leaving it available for DHCP traffic only. But then how does the client find the WDS server? You set option 60 in DHCP. If you install WDS on a server that's already running DHCP, during the configuration of WDS the DHCP Option 60 page will appear, and you can select both Do not listen on port 67 and Configure DHCP option 60 to “PXEClient”. If you install DHCP on a machine that already has WDS installed, you must manually enable option 60 in DHCP. Related: WDS Server Modes CONFIGURING DHCP OPTIONS You set DHCP options in the DHCP snap-in found in Server Manager. Expand IPV4, and then if you want to set a Server option, right-click Server Options and choose Configure Options. For a Scope option, expand your scope, right-click Scope Options and choose Configure Options. On the General tab, select the 060 PXEClient check box. For options 66 and 67, scroll down to find 066 Boot Server Host Name. When you select this check box, the String value field in the Data entry box opens. Type in either the IP address or the name of your WDS server. Option 67 is similar to option 66; if you select the 067 Bootfile Name check box, the String value field in the Data entry box opens. Type the name of the file you want your clients to boot. I found these file names in the WDS snap-in/properties of the WDS server/Boot tab. Be sure to get the entire path: boot\x86\pxeboot.com for 32-bit clients and boot\x64\pxeboot.com for 64 bit clients. Related: How do I enable DHCP Name Protection for a scope in Windows Server 2008 R2? and Q: What is DHCP Name Protection in Windows Server 2008R2? 2 comments Hide comments Comment * Rich Text Editor, edit-comment-body-59223 Editor toolbars BoldKeyboard shortcut Ctrl+B ItalicKeyboard shortcut Ctrl+I Block Quote Press ALT 0 for help ◢Elements path Switch to plain text editor More information about text formats Text format CommentsPlain text COMMENTS * Allowed HTML tags: <em> <strong> <blockquote> <br> <p> PLAIN TEXT * No HTML tags allowed. * Web page addresses and e-mail addresses turn into links automatically. * Lines and paragraphs break automatically. 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