DHCP Server's DNS Tab

Mmartin_47

Was watching my CBT videos on DHCP and the instructor didn't really explain it that well what these following options in the DHCP server's properties - DNS tab:

Dynamically update DNS A and PTR records only if requested by the DHCP clients

Always dynamically update DNS A and PTR records

The MSPress book for 291 says this:
If the first option, the default, is selected, the DHCP server attempts to update resource records only according to the client's request.

My question is: what request?

Can someone explain it to me in other terms. Thanks!

dales

technet have quite a good article on this


Using DNS servers with DHCP: Dynamic Host Configuration Protocol (DHCP)

Mmartin_47

dales wrote: »

technet have quite a good article on this


Using DNS servers with DHCP: Dynamic Host Configuration Protocol (DHCP)

Thanks dales. Helps a lot.

Mmartin_47

Ok I went ahead and read the white paper. It states:

"This process requires the use of an additional DHCP option, the client FQDN (option 81).

Question is- where's option 81?

Essendon

Maybe you have already found out what option 81 is. But it's the DNS tab in the DHCP server's properties. Allows for dynamic updates of DNS records.

Read this for more info, DHCP Option 81 - Petri.co.il forums by Daniel Petri

Mmartin_47

Essendon wrote: »

Maybe you have already found out what option 81 is. But it's the DNS tab in the DHCP server's properties. Allows for dynamic updates of DNS records.

Read this for more info, DHCP Option 81 - Petri.co.il forums by Daniel Petri

Thanks! Yeah I was wondering where the heck did they get option 81? Got it though. Appreciate the link.

Mmartin_47

So exactly what is the purpose of updating DNS when a client receives a new IP address from the DHCP server?

Correct me if I'm wrong... but the reason is to make sure host names can be resolved to an IP address?

Essendon

Yupp, reduces need for manual administration of zones. Especially for machines that move around in a network and obtain IP addresses via DHCP.

More reading, http://technet.microsoft.com/en-us/library/cc784052.aspx

Mmartin_47

Thanks. Yeah I know about DNS but like I said in previous topics, I've failed 291 and got discouraged after failing twice. But I'm following the CBT nuggets. DNS topic is next I believe. So after reading DNS again it should make more sense, but I got the idea of dynamic updates.

Essendon

Yeah I can feel the pain too Michael. The 291 sure is a beast of an exam. I scraped by with a 700. I remember getting hammered with DNS, still hurts..!! Good on you for sticking with the task. If it makes you feel any better, I failed the CCNA twice too.

Mmartin_47

Essendon wrote: »

Yeah I can feel the pain too Michael. The 291 sure is a beast of an exam. I scraped by with a 700. I remember getting hammered with DNS, still hurts..!! Good on you for sticking with the task. If it makes you feel any better, I failed the CCNA twice too.

Curious, how did you know my name? Was it it another thread? Just wondering.

Essendon

Mmartin_47 wrote: »

Curious, how did you know my name? Was it it another thread? Just wondering.

My Magic Crystal Ball tells me what I want to know.

Yeah, you wrote it in another thread.