Multiple Records with Bind 9.1.0 & Windows 2K DHCP

[Kevin Darcy]

Mohammed Ghanawi wrote:

> Hello Bind experts,
>
> We have been testing Bind 9.1.0 with Windows 2000 DHCP, we have also
> tested Windows 2000 DNS with Windows 2000 DHCP, and have came up with
> the following results in regards to A & PTR records dynamic update:
>
> 1. Windows 2000 DNS seems to work fine with Windows 2000 DHCP.
> 2. Bind 9.1.0 fails to update old records and ends up adding multiple A
> & PTR entries.
>
> Now I know that everyone claims that Windows 2000 DHCP is not cleaning
> after itself, but the question is why does it clean after itself when
> using Windows 2000 DNS.

I dimly recall that the Win2K DNS/DHCP subsystem has a feature called
"scavenging" that removes old records when they haven't been used for a
while. This scavenging feature is probably cleaning up after the Microsoft
DHCP server's laziness/sloppiness.

Does it surprise you in the least that a Microsoft product would generate
lower-quality results when used in a heterogenous environment than when
used in a homogenous one? Scavenging is an interesting feature, but in no
way should it function as a *substitute* for proper DHCP server
behavior.
- Kevin