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NBNS broadcast queries are fqdn

Posted on 2009-04-17
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Last Modified: 2013-11-25
I have a Windows 2003 domain.  Multiple sites.

We run WINS and DNS.  The clients are in Hybrid mode, DHCP hands out WINS and DNS servers.
I checked the WINS stats and there was over 10,000 records not found.  I started up wireshark and found that clients and broadcasting Name Queries for FQDN.

For instance since clients are in Hybrid mode it queries WINS, but WINS only has netbios names.  So it is not found so then it broadcasts to find name.domain.com and it is not found.  I have a lot of this traffic.  What could be causing the clients to request fqdn over the netbios protocol?  DNS is working fine and there are no problems resolving names across the network.  All of the queries in question are for the DC's in the local site.
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Question by:theklap
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by:Michael Pfister
ID: 24174150
Does DHCP also set the correct domain name (Option 015)? Post an ipconfig /all of a client here.
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by:theklap
ID: 24184307
Yes, Primary Dns Suffix, DNS Suffix Search List and Connection-specific DNS Suffix are all set on the client and they are correct.

Option 015 on the DHCP server is set to the domain name as well.
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by:theklap
ID: 24184817
In looking at the wireshark output, I noticed that some of these queries are for record type 20 the server service.  But most of them are for record type 47.  I have no idea what record type 47 is used for.

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by:Michael Pfister
ID: 24186323
I've found nothing about record type 47 ...
Depending on your entire network you may want to think about eliminating WINS.
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by:theklap
ID: 24187115
Eliminate wins and netbios over tcp?

or just wins?

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Michael Pfister earned 1500 total points
ID: 24190929
As a first step, WINS would be enough. If you have a working DNS infrastructure, WINS is no longer required. Only NT 4 could be a problem or some old applications.
Same is valid for NBT. In a WIndows 2003/XP/Vista environment its no longer needed.

On the other hand, WINS sometimes "hides" DNS problems and if your turn off WINS they suddenly become visible. So you have to check your LAN/WAN/VPN whatever infrastructure if everything is fine.

HTH
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