Dear Server Expert,

our AD is using Windows Server 2008 R2. Currently AD, DNS, and DHCP are actually hosted under this server.

We have multiple different VLAN and we separate between Wired and WIFI VLAN. the wired VLANs are obtaining their DHCP from the AD, whereby the WIFI VLAN are obtaining the DHCP from the wireless controller.

Sometimes, when I would like to ping to the hostname to check on the clients computer, I can't get thru because user might has changed from wired to wifi and the dns need time to update.

how should I change or modify the dns update timing to faster for this?

Thanks.

Regards

Hi Henry,

I suppose we could try to configure on DHCP server.

1. Open DHCP console and expand DHCP server.
2. Right click on IPv4 and click Properties.
3. Click DNS tab and select Discard A and PTR records when lease is delated.
4. Click OK to exit.

Best Regards,

Leo

Hi Henry,

I suppose we could try to configure on DHCP server.

1. Open DHCP console and expand DHCP server.
2. Right click on IPv4 and click Properties.
3. Click DNS tab and select Discard A and PTR records when lease is delated.
4. Click OK to exit.

Best Regards,

Hi Henry,

I have found a blog about optimizing DNS records. It may be helpful for you.

Optimizing your network to keep your DNS squeaky clean:
http://blogs.technet.com/b/networking/archive/2009/02/09/optimizing-your-network-to-keep-your-dns-squeaky-clean.aspx

Here is the reference for aging and scavenging:
Using DNS Aging and Scavenging:
https://technet.microsoft.com/en-us/library/cc757041(v=ws.10).aspx

Best Regards,

Leo

Hi Leo,

Thanks for your advise on the article. I found that it is actually quite risky to do the scavenging on the DNS as I am worry it will also remove all the static records in our dns server. I read some articles about people trying to perform scavenging and the end all of dns records are gone. By right, the static records should not be scavenged. maybe I still don't understand fully how the DNS scavenging work. do you have any other idea on how to do it safely?

Thanks.

Appreciate your help.

Regards,

H