Re: Unusable DNS, 10.4 Tiger
Re: Unusable DNS, 10.4 Tiger
- Subject: Re: Unusable DNS, 10.4 Tiger
- From: "Peter Sichel" <email@hidden>
- Date: Wed, 30 Nov 2005 21:03:29 -0500
On 11/30/05, email@hidden wrote:
>For whatever reason,
>any DNS lookup on my computer takes 5-7 seconds. If I try the query
>again, it takes a fraction of a second, but sometimes reverts to the
>full time.
Hi Zack,
I don't know the solution to your problem, but I do have a few
troubleshooting ideas that might help. As you may know, I'm the
developer of a network troubleshooting utility called IPNetMonitorX.
You can download and try it free for 21 days. Ideas:
(1) Does it help to flush the DNR cache?
(Flush Cache in IPNetMonitorX Lookup tool)
(2) Can you isolate the problem to the local DNR (Domain Name Resolver)
versus querying the corresponding name server directly? IPNetMonitorX
has both a "Lookup" tool that uses the local DNR and a "NS Query" tool
that allows you to query the corresponding name server directly. How do
the results compare?
(3) Use the TCP Dump tool with options "-n -p udp port 53" to watch DNS
queries on the wire. Is the query being sent to the expected server
promptly, or trying some other servers first? Does the response (if
any) arrive promptly?
(4) What Name Servers did you actually get back from the DHCP Server on
your LAN if any? You can view these in the DHCP Lease tool.
I'm guessing there might be some problem with the configured name
servers, or some conflict related to DNR caching. I haven't seen this
particular behavior in my own experience, but I have noticed Tiger can
sometimes lose its router information when switching between Ethernet
and AirPort configurations with a short or interrupted sleep in
between. The IP reconfiguration process appears susceptible to
awkwardly timed interruptions. When this happens, I just turn AirPort
off and back on to force the IP stack to reconfigure.
Kind Regards,
- Peter
IPNetMonitorX: <ftp://sustworks.com/IPNetMonitorX_1.6.4.dmg>
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