Re: DHCP - DDNS

Great!
Thanks for the reply.
It is really helpful.

Cheers
Wayne

"Kevin D. Goodknecht Sr. [MVP]" wrote:

> Wayne Gore <WayneGore@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> > Hi
> >
> > We are working on implementing DDNS in our network.
> >
> > We want to configure it so that our DHCP server adds, updates and
> > removes the records in the DNS server.
> >
> > The DNS server is installed on our Windows 2003 domain controller and
> > our DHCP server is installed on a Windows 2000 member server.
>
> Win2k3 does a better job of doing dynamic updates because it can be
> configured with a user account to authenticate with DNS for doing updates.
>
> >
> > We have selected the DHCP configuration "Enable DNS dynamic updates
> > according to the settings below: Dymanically update DNS A and PTR
> > records only if requested by the DHCP client".
> > We also selected "Discard A and PTR records when lease is deleted".
> >
> > First question:
> > What does it mean "...if requested by the DHCP client"? Where can I
> > configure the client to request this?
>
> This is the check box on the DNS tab of TCP/IP properties for register this
> connection's addresses in DNS.
>
> >
> > Our DHCP server is not adding any records to the DNS server.
> >
> > Second question:
> > Since the DHCP and DNS server is installed on two different servers,
> > do I need to run the DHCP server service with a domain account rather
> > than with the local system account?
>
> No, add the member server with DHCP to the DNSUpdateProxy Group.
>
> >
> > Third question:
> > I scanned the internet after some information and some MS kb's
> > mention that one need to configure DHCP option 81 in order to have
> > the client registered. I checked on my DHCP server (W2k) and I have
> > no options after number 76! Do I need this option and if so, what do
> > I have to do in order to have it?
>
> Option 081 *is* the DNS tab of the DHCP properties ***.
> Option 015 must be configured with the suffix of the domain to be registered
> in.
> The DHCP server service uses the DNS servers listed in TCP/IP properties for
> DNS updates.
> Keep in mind, once DHCP registers for a client, it becomes the owner of the
> client's RR in DNS, and the client will no longer be able to update the
> record.
> IMO, I prefer DHCP to all updates, because your zones will have fewer
> conflicting records. This is more common in the reverse lookup zone, because
> a PTR registered by one client cannot be updated by another client. So I use
> "Always update DNS" and remove A and PTR records when lease expires. This
> still becomes a problem if the lease is too long and you have laptops
> getting leases from DHCP because how many users actually release the DHCP
> lease before pulling the plug?
> I set my lease duration to one day so if this happens a lot DHCP will remove
> records the next day.
> I also use the Microsoft option to release address lease on shutdown. This
> option still won't help for suddenly disconnected clients, but even then the
> record is removed when the lease expires on disconnected clients.
>
> Read this section to configure DHCP to do dynamic updates.
> http://support.microsoft.com/kb/317590/en-us#XSLTH3203121122120121120120
>
> --
> Best regards,
> Kevin D. Goodknecht Sr. [MVP]
> Hope This Helps
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