Re: Multiple NIC's in DNS server causes invalid IP in DomainDNSZones



Matt Nowell <mdnowell@xxxxxxxxxxxxxxxxxxx> wrote:
> Good morning,
>
> We're having an interesting problem with Weblogic interaction with
> Active Directory. I think it's a DNS issue, however please redirect
> me to other groups if need be. I'm not cross posting, since that's
> just plain rude!
>
> Active Directory Description: We have 3 sites, with one domain
> controller in each site. We are a single domain structure.
>
> DC description: Each domain controller is running Windows 2003, and
> they were all UPGRADED from Windows 2000. Each DC also serves as a
> DNS server. We have not created a directory partition for
> DomainDNSZones or ForestDNSZones. No DC is at SP1.
>
> Problem: Weblogic is using Active Directory as the LDAP structure for
> authentication. We're having a problem in that queries for groups is
> taking a painfully long time. After some network sniffing, we've
> found that Weblogic performs a lookup on DomainDNSZones.domain.com to
> find an LDAP server to talk to. When we do a DNS lookup on
> DomainDNSZones.domain.com, the backup NIC for one of our domain
> controllers shows in the list. Since there is no gateway for that
> NIC, and the segment is nonroutable, the LDAP queries fail when that
> IP (10.1.99.*) comes up first in the list. This causes Weblogic to
> spin for some time before failing to the next server in the list.
> Since the other three servers in the list are valid, it works after
> that.
>
> The workaround for now is to disable the secondary NIC in the problem
> child DC. However, we'd like to keep that NIC active for backup
> purposes, but not have it tied into the DomainDNSZones. Is there a
> way to do that?
>
> If I've left any information out, or any further information would
> help, please let me know.

You have to stop registration of the addresses on the second NIC, make sure
the first NIC is at the top of the binding order. The manually add the
correct records in DNS, there are two records if the DC is also a Global
Catalog.
Here is a word document I wrote combining several KB articles on Multi-homed
DCs. All of these entries are available in different KB articles, I just
combined them when a DC is multi-homed, has RAS, DNS and WINS. Add the
entries and records you need.


http://support.wftx.us/Multihomed.doc



--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
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