September 2007
Intermediate to advanced
170 pages
4h 24m
English
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The Browser's Perspective
As discussed earlier in the "Factors Affecting DNS Caching" section, a lot of independent variables determine whether a particular browser request for a hostname makes a remote DNS request. There is a DNS specification (http://tools.ietf.org/html/rfc1034), but it gives clients flexibility in how the DNS cache works. I'll focus on Internet Explorer and Firefox on Microsoft Windows, since they are the most popular platforms.
The DNS cache on Microsoft Windows is managed by the DNS Client
service. You can view and flush the DNS Client service using the
ipconfig command:
ipconfig /displaydns ipconfig /flushdns
Rebooting also clears the DNS Client service cache. In addition to the DNS Client service, Internet Explorer and Firefox browsers have their own DNS caches. Restarting the browser clears the browser cache, but not the DNS Client service cache.
Internet Explorer
Internet Explorer's DNS cache is controlled by three registry
settings: DnsCacheTimeout, KeepAliveTimeout, and ServerInfoTimeOut, which can be created in
the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\InternetSettings\
There are two Microsoft Support articles describing how these settings affect the DNS cache.[8] These articles report the following default values for these settings:
DnsCacheTimeout: 30 minutesKeepAliveTimeout: 1 minuteServerInfoTimeOut: 2 minutes
What's implied (but not explained very well) is that DNS server TTL values less than 30 minutes have ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.