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Slow DNS / slow Internet Explorer loading of website.

Posted on 2009-05-05
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Last Modified: 2013-12-08
We use OS X 10.5 as our LAN DNS server, all PCs point the DNS to this server.

Since a few months ago, we noticed the 1st page of the website takes along time to appear, sometimes almost a minute, but clicking on links within the same website is very fast i.e. less than 3 secs.  Using the IP address of the website is also faster than using the domain name.

Our server is not overloaded i.e. CPU utilization less than 5% and we are on Gigabit Ethernet Switch. Our Internet connection is also not congested i.e. ping to industrial strength website is flat and not spikey.

Any suggestion on what could be the cause? any comments welcomed.
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Question by:artradis
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jar3817 earned 500 total points
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Is this DNS server a recursive one, or does it forward requests it can't answer to some upstream server (like your ISP's dns server)? By recursive, I mean will it find the answer itself or ask another server to do the work for it.

If recursive, I'd check the root hints (the IP addresses of the root server) it is using. There might be some wrong addresses in there causing the server to timeout before moving to another one that actually answers. This is the current list of root hints:

http://www.internic.net/zones/named.root

If your server fowards unknown requests to another server, try changing that forward server to something else. You could test with 4.2.2.2 or any of the opendns servers.

Subsequent page views are fast because the local server has the address cached and doesn't have to look it up again until the record expires.
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