DHCP - DDNS
Wayne Gore
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.
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?
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?
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?
Regards
Wayne
Kevin D. Goodknecht Sr. [MVP]
> 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 sheet.
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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Wayne Gore
Thanks for the reply.
It is really helpful.
Cheers
Wayne