Re: Multiple PTR records wont go away in the reverse zone.

Ok, this is the question my team posed when I shared this with them.

"All sounds good. Now please consider how disabling DDNS on DHCP clients
will affect these clients when they are roaming on external broadband
networks and need to get an IP address and possibly register with DNS. Is
that an issue? All laptops have to be able to function correctly on and off
the corporate network."

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

Read inline please.

In news:1193831940.155524.171050@xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
james_tulloch@xxxxxxx <james_tulloch@xxxxxxx> typed:
Kevin,

Please can I ask you to clarify your position on the comment above as
I am having a similar problem. Most of the recommendations I read seem
to suggest letting the client handle the DNS registration and turn off
the ability for DHCP to update DNS.

Look forward to your thoughts.

No problem, I have explained this several times but it has been a while.
When I client registers a PTR in the reverse lookup zone, it's name is
actually the in-addr.arpa name. Only the client that created the record can
remove it or update it when Secure only updates are enabled. So if the
client leaves the record behind, usually because of sudden disconnection
(Network cable disconnected), the next client that comes along and gets the
IP for the in-addr.arpa record cannot update the record, so it creates
another. The DHCP server cannot remove it because it doesn't have permission
to remove it either, because it (DHCP) did not create the record.

DHCP can be configured to register in DNS for clients that do not or cannot
request updates and any record DHCP creates, it can update and remove when
the IP is lease to a different client or if the lease expires. But in order
for this to happen, DDNS updates needs to be disabled on DHCP clients, or
they will attempt DDNS updates. It is a vicious circle, the only way to
break the circle is to disable DDNS on DHCP clients and let DHCP handle all
updates.

DHCP Should have these additional options and settings.
Advanced option Windows 2000 Option 002 (0x1)
Option 015 Domain Name (Dynamic domain zone name)

DHCP Server properties, DNS tab:
Enable DNS dynamic updates
Always update A and PTR records
Discard A and PTR records when lease is deleted
Dynamically update DNS A and PTR records for clients that do not request
updates.
Properties *** Advanced tab:
Configure dedicated user account credentials. (same account must be used on
all DHCP servers)



--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps

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