DNS reverse lookup windows 2003

[bidon15]

Hello,
Does any one can help me or explain to me why the reverse lookup zone that it has multiple names with a same IP address on the DNS server?
EX:
Let's say - when i do nslookup on the IP it comes back with nameA, do it again same ip and it comes back with nameB, or nameC. etc...

I checked it on the Forward lookup zone and i see there is one record in there with one IP address.

Seems like the reverse look up or pointer is not up to date.

Would you brief to me where do i go to fix it?
Greatly appreciate it!

 

[SnoopFrogg]

CNAME (Alias) records allow you to map multiple names to the same IP- I'd check to see if you have CNAME records for this IP.

[purple]
SnoopFrogg
MCSA+Security - Windows Server 2003
[/purple]

 

[bidon15]

Hello Snoopfrogg,
There is not, however, i have manaully purged the old records and enaled the scavening stale records every 1 day period. It's cleared all the old records now.

Do you know any drawback of enable this? some reasons it never been enabled before?
Thanks

 

[SnoopFrogg]

Hi Bidon15,

I don't know of any real drawback to enabling this setting. Microsoft does say in a related support page (

http://www.microsoft.com/technet/pr...lp/6c931ac8-d9c9-4c91-ba33-bfca90573886.mspx)

that it's disabled by default due to the possibility of deleting valid resource records if "parameters aren't fully understood."




[purple]
SnoopFrogg
MCSA+Security - Windows Server 2003
[/purple]

 

[bidon15]

Hi SnoopFrogg,

That's true. It deleted those valid RRs. I disabled it for now. I am thinking if i leave it disable and time to time it will build up all those old RRs and might effect the performent and responsiveness of DNS server.

What is a best way to maintain the DNS resource records?

Just curiousity, when a Alias record is created manually, or the Status IP address is asigned, does it has a timetamp, or does scavening delete the stale record too?

Thanks,

 

[SnoopFrogg]

What is a best way to maintain the DNS resource records?
I'll preface what I say by saying that I've only worked with DNS for about a year and a half now so I am by no means an expert. That being said here goes:

Besides implementing scavenging, implementing dynamic updates in DHCP helps maintain resource records. By setting up dynamic updates, DHCP updates A and PTR records when clients renew IP addresses. Set the option to delete A and PTR records when the lease is deleted and set the option to update RRs for NT 4.0 clients (assuming you have any).

If you are not running Active Directory Integrated DNS, see this article for a warning on enabling scavenging:

http://www.microsoft.com/technet/pr...ns/20fbbd82-0cea-4a74-9634-fdd993f4c4f4.mspx.

Just curiousity, when a Alias record is created manually, or the Status IP address is asigned, does it has a timetamp, or does scavening delete the stale record too?
I'm not familiar with scavenging's effects on CNAME records. I searched Google a few times and didn't come up with anything.

[purple]
SnoopFrogg
MCSA+Security - Windows Server 2003
[/purple]

 

[bidon15]

Thanks SnoopFrogg! I have enabled DNS dymanic updates A and PRT records. Let's see will these old R records will be accumulated again. Thanks for your quickly response.
Very Appreciated it!