Re: Multiple PTR records wont go away in the reverse zone.
- From: WILDcorp <WILDcorp@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 1 Nov 2007 08:51:01 -0700
I don't know if this thread got stale. Thought I would post again to maybe
bring it to your attention again.
"Jimmy Carter" wrote:
To provide history (I work with WILDcorp):.
When scavenging was implemented a few months ago (disasterously), scavenging
intervals were set at 4 hours, with DHCP leases at 8 hours. Our servers' A
records were being deleted.
It's my contention that we will not have significant issues by simply using
a sane scavenging interval (7 days). In addition, provide appropriate rights
to the DHCP server to clear DNS A and PTR records, and leave DDNS on all
clients.
Are there any additional opinions about what leaving DDNS on will do to this
situation?
Currently, on many Class C subnets, we have over 3,000 PTR records (with
scavenging turned 100% off).
I proposed deleting all PTR records from client subnets, turning scavenging
on to default values, and providing authentication to the DHCP server to
clean PTR records.
What we're afraid of is having server DNS entries deleted again. Was it
likely the short scavenging interval which caused the issue previously?
"WILDcorp" wrote:
That was my take also. The team has some more concerns...
"Are you 100% sure that this is the behavior? I'm not seeing any
documentation about disabling DDNS being necessary. In fact, it sounds like
since the DHCP client is what updates DNS anyway, the DHCP server has rights
to delete any PTR records http://www.pcreview.co.uk/forums/thread-1470740.php
What about the DHCP setting "Dynamically update DNS A and PTR records only
if requested", so clients will specify.
I've been in global/mobile environments before, and have been pretty
successful with just leaving DNS settings at their defaults...
I do agree with all your DHCP server recommendations (especially entering
matching authentication information), but don't see DDNS updates being
necessary. Can you send me the document you're seeing that on? Or how
you're deciding this?"
Please could you give me your answers to his questions? Thanks.
BT
"Kevin D. Goodknecht Sr. [MVP]" wrote:
Read inline please.
In news:BA6C3083-015F-4839-87E5-7825B997D9AE@xxxxxxxxxxxxx,
WILDcorp <WILDcorp@xxxxxxxxxxxxxxxxxxxxxxxxx> typed:
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."
Actually, there is no other reason for a client to register in DNS when off
the corporate network. Any ISP that requires Dynamic updates, has certainly
configured their DHCP server to do the registrations because for the most
part, only newer windows clients register in DNS. I can almost guarantee
that these ISPs that require DDNS registrations are few and far between.
--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
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