Re: Unusable DNS, 10.4 Tiger

Subject: Re: Unusable DNS, 10.4 Tiger

From: Dalton Hamilton <email@hidden>

Date: Fri, 2 Dec 2005 08:39:25 +0100

Delivered-to: email@hidden

From my understanding of how DNS resolution works, your #2 statement below doesn't make sense to me. DNS lookups use UDP only. TCP is only used for zone transfers. Therefore, this should not have affected resolution performance of a client resolver to the DNS server.

Can you correct my mis-understanding?

-----------------------------------------------------------------

Dalton Hamilton

We had the same problem on our corporate network here at work. On one of our subnets, DNS lookups were taking an obscene amount of time. It made browsing the Web on a gigabit connection feel like a 33.6K modem.

I tracked it down to two seperate problems:
1) lookupd was crashing nearly *every* DNS lookup. I had hundreds of crash reports for lookupd. I never fixed that one obviously.
2) Our corporate firewall ruleset was blocking TCP DNS requests. For some reason the internal DNS server liked to use TCP more times than it should.

Fixing #2 helped a lot, but it still does NOT feel very "snappy". I'd be happy to send anybody at Apple the crash reports for lookupd. I stopped submitting the bug report a while ago; it's stayed in "anlayze" ever since Tiger shipped.

Ryan

_______________________________________________
Do not post admin requests to the list. They will be ignored.
Macnetworkprog mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/macnetworkprog/email@hidden

This email sent to email@hidden

_______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/macnetworkprog/email@hidden This email sent to email@hidden

Follow-Ups:

Re: Unusable DNS, 10.4 Tiger
- From: "Justin C. Walker" <email@hidden>

References:

>Re: Unusable DNS, 10.4 Tiger (From: Ryan McGann <email@hidden>)