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8.3

Bad DNS packets

Asked by BGilhooley in Domain Name Service (DNS), Active Directory, Windows Networking

Tags: Microsoft, Windows Server, DNS errors

Just in the last few days I starting getting some unusual DNS errors. Network setup is this:

- 3 Active Directory DC's, 2 of which are also DNS servers.
- One DNS server is windows 2000 and one is 2003
- AD Integrated DNS.

Server 2003 machine has an IP of 192.168.1.253
Server 2000 machine has an IP of 192.168.1.2

DNS TCP-IP settings on 192.168.1.253 are it points to itself first and 192.168.1.2 second.
DNS TCP/IP settings on 192.168.1.2 are it points to itself first and 192.168.1.253 second

I'm getting event ID's 5504 and 5505.

"The DNS server encountered an invalid domain name in a packet from 192.168.1.253."
"The DNS server encountered a domain name exceeding the maximum length in the packet."

This is obviously weird and 192.168.1.253 is one of my DNS servers.

- - - - - - - - - - - - - - - - - - - - - - - - - - - -
Running NETDIAG on 192.168.1.2

  PASS - All the DNS entries for DC are registered on DNS server '192.168.1.2' and other DCs also have some of the names registered.
    PASS - All the DNS entries for DC are registered on DNS server '192.168.1.253' and other DCs also have some of the names registered.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Running NETDIAG on 192.168.1.253 DNS test also passes.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  - - - - -
** Running NETDIAG on my other DC that isnt a DNS server gives me a strange result.**

DNS test . . . . . . . . . . . . . : Passed
          [WARNING] Cannot find a primary authoritative DNS server for the name
            'adminserver.gilroygannon.com.'. [ERROR_TIMEOUT]
            The name 'adminserver.gilroygannon.com.' may not be registered in DNS.
    PASS - All the DNS entries for DC are registered on DNS server '192.168.1.2' and other DCs also have some of the names registered.
    PASS - All the DNS entries for DC are registered on DNS server '192.168.1.253' and other DCs also have some of the names registered.
- - - - - - - - - - - - - - - - - - - - - - -  - - - - - - - - - - - - - - - - - -

I've tried the REGISTERDNS command on this DC however it still gives this netdiag error.


I havent made any recent DNS changes so I'm concerned mainly why I'm getting errors about bad packets from one of my own internal DNS servers. I sometimes get a few from external addresses but this hasnt been a problem. My own one might. Any theories where I need to check next?





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About this solution

Zones: Domain Name Service (DNS), Active Directory, Windows Networking
Tags: Microsoft, Windows Server, DNS errors
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Solution Provided By: Chris-Dent
Participating Experts: 2
Solution Grade: A
 
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