Weird DNS resolving issue
Kevin Darcy
kcd at daimlerchrysler.com
Thu Sep 16 18:32:47 UTC 2004
Are the named.conf files identical? Do you use forwarding? To the same
forwarder or different forwarders? Are you going through a firewall, and
is the firewall configured with identical rules for the two nameservers?
As for the external DSL nslookup failures, that's probably just the
combined effect of nslookup's idiocy about reverse-resolving nameserver
addresses, plus the fact that the xxx.xxx.122.62 address doesn't
reverse-resolve on the Internet. Using a real lookup tool like dig,
which doesn't have this reverse-lookup "feature", avoids these kinds of
problems.
- Kevin
Layne Meier wrote:
>I have an identical pair of Sun Netra T1-105 servers running Sun
>Solaris 8.
>
>They both were built and configured on the same day, with an identical
>build (OS, Patches, Applications, etc.)
>
>Here is my problem.
>
>The secondary DNS server has no problem resolving external domains
>(ibm.com, intel.com, microsoft.com, apple.com, etc.) However, the
>primary DNS server times out:
>
>dns1:root:54:etc:# nslookup www.apple.com
>Server: dns1.statesman.com
>Address: xxx.xxx.122.62
>
>*** dns1.statesman.com can't find www.apple.com: Non-existent
>host/domain
>dns1:root:55:etc:# nslookup www.intel.com
>Server: dns1.statesman.com
>Address: xxx.xxx.122.62
>
>*** dns1.statesman.com can't find www.intel.com: Non-existent
>host/domain
>
>Same example from DNS2:
>
>dns2:root:2:/:# nslookup www.apple.com
>Server: dns2.statesman.com
>Address: xxx.xxx.124.62
>
>Non-authoritative answer:
>Name: www.apple.com.akadns.net
>Address: 17.112.152.32
>Aliases: www.apple.com
>
>dns2:root:3:/:# nslookup www.intel.com
>Server: dns2.statesman.com
>Address: xxx.xxx.124.62
>
>Non-authoritative answer:
>Name: www.glb.intel.com
>Address: 198.175.96.33
>Aliases: www.intel.com
>
>
>If I try to perform a direct NSLOOKUP to DNS1 from an external DSL
>Source, I get the following:
>
>C:\>nslookup - xxx.xxx.122.62
>DNS request timed out.
> timeout was 2 seconds.
>*** Can't find server name for address xxx.xxx.122.62: Timed out
>Default Server: UnKnown
>Address: xxx.xxx.122.62
>
> >
>
> From DNS2:
>
>C:\>nslookup - xxx.xxx.124.62
>Default Server: dns2.statesman.com
>Address: xxx.xxx.124.62
>
> >
>
>
>
>Any ideas or clues as to what is happening here? They are running BIND
>V-8.2.7
>
>Thank you,
>Layne Meier
>Atlanta Newspapers, Inc.
>
>
>
>
>
>
>
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