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Re: Problems with QDNS
From: Mia''s Virtual Post Office
Date: Thursday, February 27, 2003
Time: 10:38:55 am
On Thursday, February 27, 2003, at 12:07 PM, Alan Ordway wrote:
>
> On Thursday, February 27, 2003, at 10:40 AM, Men & Mice Support wrote:
>
>> Please don't send formatted messages to the list. Plain text is
>> preferable.
> sorry about that.
>
>> My initial guess is that the first response was sent back after the
>> browser had already given up. For the second case, much of the
>> required data was cached, so only two queries needed to be sent: one
>> to get the CNAME record and a follow-up to get the A record.
>
> The first response was not after the browser gave up. The browser
> asked two more times before it gave the message that the server
> www.apple.com could not be found.
> I agree it was cached on the DNS server the second time since the
> second one was only 4 seconds after the first and the ttl is 60. But
> shouldn't the cached response be the same as the first response? They
> are slightly different. Oops, I just looked at them again and realized
> I sent packets from two different traces. Here is the correct raw > data.
>
> Could this be a problem with OSX client and not with DNS?
>
>
Correctomundo! Yes, it is Safari, and OSX. The biggest problem with
OSX as it concerns "caching" is the fact that it caches DNS information
FOREVER, or at least it seems that way.
Case in point. I had to change the IP address on a internal POP server
we have on our network recently. I have an account in my Mail.App that
checks hat particular box that had the IP changed. Two friggin days
later and mail.app still cannot log into the account. Why? Because
either Mail.App or OSX is stupid and caches all DNS info, and never
expires the cache. So obviously mail.app has no clue that this server
is on a different IP , even though the TTL for the domain was 300 and
the rest of the world knows the new IP. However, simply quitting
mail.app will not fix this problem. You must reboot the whole box.
Reboot a NIX box you say? What gives Apple?
Now I have Claris (the best email client) Emailer running on my old PB
at home and it knows about the change. In fact, every OS/client combo
I tried knows about the change, except Mail.App on OSX. Hell, event a
copy of Claris Emailer on the very same box that Mail.App is running
on, under classic knows about the change.
What gives Apple?
Regards,
Jeremy Anthony Kinsey
VP Network Operations Colocate Your Server at hostdrive.com
________________________________________________________
www.bella-mia.com Maria's Internet Access
www.mia.net
www.dslone.com
Bella Mia, Inc.
401 Host Drive e-mail: jer@mia.net
Lake Geneva, WI. 53147 Phone: (262)248-6759 Fax: (262)248-6959
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