DHCP and DNS Best Practices

[Kedgar]

Hi, over the years, I have noticed many a problem with inconsistent DNS records for Non-Microsoft desktops in my environment. We do exclusively use Microsoft Active Directory. Some of the issues include:
- Multiple A records for an IP
- Missing or incorrect PTR records

Have you noticed this in your environments? I have set the following DHCP settings that seem to be helping greatly. I was wondering if there are any other tips/standards you use on your networks?

[Kedgar]

Does anyone have any input into this? Just curious what you are doing at your sites and if you have issues or not.

[Aziz]

@Kedgar

I have the same settings as you:

[Kedgar]

Awesome, Thanks!

[bradtchapman]

I would add the following suggestions:

• Ensure the DNS system is set to auto-scavenge stale records.
• Check the default scavenge periods: 7+7 days.
• Ensure that your DHCP lease times are at least as long as your first scavenge period (e.g.: 7 days).
• Dynamic DNS updates should be enabled (as pictured above).

The timing between DHCP leases and DNS scavenging ensures that you don't have lingering entries for hosts that point to the wrong IP address, and that they get updated ASAP when a system rejoins the network and requests a new IP address.