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Kevin Remde's IT Pro WebLog

Windows Server 2003 Administration Webcast Series (Part 9 – DHCP) Q&A

Yay!  No major audio or timing issues this week!  It’s so much fun when things go right!

Here, is this week’s “best of” Q&A log from the webcast.  Sincere thanks again to my teammates for doing such a great job helping to answer questions!  I give them the credit for the information in this document.  Wonderful!

Also I want to make sure also have the link to the Session Resources I posted for Part 9, and the homework assignment also.

Part 9 Questions and Answers:

“Thank for the informative webcast every week. Some times would be nice, if the webcast would earlier in the morning for you.  Because it is exhausting to see all the good webcast late in the evening for us in Europe.”

Yeah… that’s a problem I wish I had considered further when originally scheduling these.  Much of my job involves travel.  I do these webcasts more often-than-not in hotels or other Microsoft Offices.  During my normal TechNet Event weeks, Wednesdays are usually travel days between Tuesday and Thursday events, so if I can’t get a flight out or drive to the next location on Tuesday night, I’ll be doing it Wednesday morning… which is why I thought later on Wednesday afternoon would be better. 

If I get the opportunity to do another series (and I’d LOVE to!), I’ll see if we can do it Monday morning instead.

“Will the past 2 events be available in live meeting format soon?”

The last one [part 8] should be posted. We’ve had problems with and are still trying to recover part 7.

Keith Combs: “I love DHCP”

Thanks, Keith.

“Can we download any presentation WMA? not pdf. Thanks.”

The WMV archive will be available 72 hours after the event.

“This is off topic, but our company would like to use this MS Office Live Meeting 7 application format for providing online demos with government Public Health Laboratories. Can you direct me to more information of how to utilize this application for such purposes (purchase, configuration, etc.)?  Good class.”

Thanks.  Have you looked at http://www.microsoft.com/livemeeting?

“No, that is the kind of thing I was asking about. Thank you. Are there others you know of?”

Yes. You might also check http://www.microsoft.com/office/livecomm/prodinfo/default.mspx

“Would you include addresses that are going to be reserved in an exclusion range?”

Yes, that’s another good way to self document those addresses.

“Is it better to use exclusions or a narrow pool range to place static entries for like servers and printers?”

Because of the inflexibility of Pools once you’ve defined them, I would make them large to begin with, and then use exclusions to narrow down what is actually being handed out by individual DHCP servers.

“Followup to the exclusion question – is there any impact to doing it either way?”

Other than the inflexibility of re-configuring pools, no.

“Is there anyway to issue out IPV6 ip addresses via DHCP?”

Not aware of any – Great Overview here – http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/security/ws03mngd/14_s3ip6.mspx

“If you have an address range for DHCP to give out, but some of those addresses are used in reservations, would DHCP know not to give out those addresses or would it cause conflicts?”

Yes, it will not give that out, but be aware that if it is already in use, it won’t force a release on the address.

“We have a number of remote users and I want to assign them an address when they VPN in.  Is there a good article describing this when using a domain controller with and a separate RRAS server?”

An address that is the same each time they connect, or just any address from a pool?

“Can be either.  Whatever would be the best practice.”

Most people set up a pool for VPN clients. Less maintenance and hassle.

“OK Is there a good KB article for setting up a pool?”

 All of the VPN deployment and planning docs will go through this.  It is also in the ISA Server 2004 planning documents in case you are using our firewall product.

“Should you confirm that there are no entries in the other tabs in TCP/IP properties before you switch to automatic pickup?”

No need.

“Does the DHCP server have to have a static address or can it obtain a reserved IP address from it’s own database?”

It should have a static address.

“If you are going from a static IP environment to a DHCP environment, will you have to touch each PC to make that change, or is there another way?”

You could use NETSH – http://support.microsoft.com/default.aspx?scid=kb;en-us;257748

“I have a Linux-based computer set up for DHCP now.  Can I configure a W2k server for DCHP while it’s running on the Linux box – or do I need to shut down the Linux box first before configuring DHCP on the W2k server?”

It’s just another DHCP server on the line, so there shouldn’t be any issues unless they are both being configured to hand out the same or overlapping address ranges.

“Can you delete the bad scope are just leave it alone?”

You can delete it.  I just left it in the demo so I could also show how superscopes were configured.

“When configuring a pool with a router, how will the dhcp know which ip address to give out for each subnet?”

Like most things computer related, it will do only what you tell it to – not what you WANT it to.   If you’re using your router as a DHCP server, then you have to be aware what addresses it’s responsible for, just as you would if you were configuring more than one DHCP server within the same physical networked area. 

“How can we integrate dhcp with DNS?”

Active Directory Integrated with DDNS – http://support.microsoft.com/default.aspx?scid=kb;en-us;816592

“I would like Kevin to settle a debate.  When is DCHP is best handled; by a gateway vs. server?”

I wasn’t aware there was a debate.  Do you mean, “Should I have my router handle addressing for me or should I have a separate server?” ?  If you are happy with how your router is working, and if you don’t mind having that single point of failure, and want to limit how much (if any) logging or auditing you have available.. and don’t want flexible configuration options… then by all means, use your router.  <grin> 

“One DHCP server with multiple subnets all with different address pools, how can i insure the right IP address goes to the correct subnet”

Typically that is the job of the Relay Agent on a particular subnet – http://support.microsoft.com/default.aspx?scid=kb;en-us;120932

“I was trained to use DORK acronym discover offer release acknowledge”


“Are the clients still can connect to resources on the network if i reboot the dhcp server?”

Yes. A DHCP server will only affect the clients if they go to request an address, and it’s down.

“Can Kevin share those funny pictures with us?”