DNS reverse lookup Server 2003

[william-swc]

Just a quick update, have deleted all PTR records relating to my campus apart from server records. Also did it for another campus. Will see the what effect, if any, it will make on Monday.

 

Cheers for everyone's help and advice so far!

[techie08]

How did you get on with this? I have the same reverse lookup zone problem in DNS of our 2 server 2003 DCs. We use macs and its causing us a few issues.

 

Thanks

[william-swc]

Hi, We cleared out the PTR records in reverse lookup which seems to be working so far. My settings are as follows:

 

My DNS settings on reverse lookup zones are:

Scavenging time 7 Days (actually another technician has just changed this to 1 hour for testing)

refresh interval 15 mins

expires after 1 day

Minimum Time to Live 1 hour

 

Under DHCP settings the DNS tab is

Enable DNS Dynamic updates (tick)

Always Dynamically update DNS A and PTR records (tick)

Discard A and PTR records when lease is deleted (tick)

Everything else unticked

 

However the iMacs are still experiencing problems but they aren't on my campus so can't say exactly what problems they are having. I was speaking to them yesterday and the guys are rebuilding the xserver for the iMacs. The problem with the iMacs initially was that when the Apple specialists were over they couldn't update the AD schema to work with the xserve so they had to configure work arounds, I think that is the root cause of our problems with the iMacs. Sorry I can't be more specific.

 

If your mac issues are directly related to DNS reverse lookup, then I would say delete the PTR records in the evening, then when staff/students turn on the computers in the morning DHCP will automatically populate the PTR records. I didn't have any adverse effects on my network by doing that and if nothing else it will ensure your reverse lookups are accurate. In my view it's win win.

[techie08]

In your DNS have you got it set to secure updates or Unsecure and Secure?

Also in my DHCP the tick box is checked for Dynamically update DNS A and PTR records for DHCP clients that do not request updates. Is yours unchecked?

 

Thanks

[william-swc]

DNS is set to secure updates only. that tick box is unchecked, the only one ticked is discard PTR and A records when lease is expired

[techie08]

I will do the same for mine then and see how it goes. Mine has the reverse lookup issue for windows clients as well as mac clients. Really frustrating!!

[techie08]

i have unchecked the box for Dynamically update DNS A and PTR records for DHCP clients that do not request updates, now macs dont register in DNS at all so this doesn't really make things any better

[HodgeHi]

I just found this link.

 

Windows 2003 DHCP/DNS server and non-Windows clients

 

I wil be trying this out when i get back to work. You never know. It might just work

[mac_shinobi]

Doh! Schoolboy error right there! lol Note to self.... static ip's don't use DHCP!!!

 

If they are reserved in dhcp does that count or is that the same as static ip addresses ?

[SYNACK]

They do count if configured like that as they are grabbed off the DHCP server and this triggers the DNS update if it is configured to do so.