January 13, 2011

A DNS question

So how, exactly, does DNS get handled? If you have a list of 4, and the early ones don't work, does it contact the first, wait for it to time out, contact the second, wait for it to time out, and then contact the third?

My Comcast DNSs still don't work, but I'm on the net because I've got the Google DNS's in my list. However, they're #3 and #4. And I've noticed that initial loading of web sites seems sluggish. I'm wondering if it's because of DNS timeouts, and that maybe I should give up on the Comcast DNSs entirely (or contact them and find out what's going on).

Posted by: Steven Den Beste in Computers at 07:35 PM | Comments (4) | Add Comment
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1 It is impossible to tell how Qube resolves without knowing exactly what code base is used. BIND resolves in parallel and sticks to those servers that answer. But it is not the only software package that was available in early 2000s to make gateway servers, and is one of the most resource-demanding. Alternatives may just poll down the list. In short, sorry, I don't know.

Residential Comcast delivers DNS information to forwarning nameservers at customer premises in DHCP. I set my gateway to ignore that information (because I set BIND to be a full-on recursive nameserver). But sometimes I save my configuration files and re-enable getting DNS addresses from Comcast temporarily, e.g. if I want to see their captive page, to register new modem. Because of that, I know that they change these addresses from time to time. Again the challenge is to know how to do this in Qube.

Posted by: Pete Zaitcev at January 13, 2011 07:52 PM (9KseV)

2

If by "Qube" you mean my Cobalt Qube, it's not involved. It's doing NAS, but it isn't involved in DNS. (It has the ability to act as one, but I've got that disabled.)

The question is what Windows does if the first two DNS's don't respond. Does that cost me time?

Posted by: Steven Den Beste at January 13, 2011 09:06 PM (+rSRq)

3 BTW, Comcast have a special page http://dns.comcast.net/

Posted by: Pete Zaitcev at January 18, 2011 01:30 PM (9KseV)

4

Awesome! That's just the information I need! My ping to DNS now is 11 milliseconds, not 140.

Posted by: Steven Den Beste at January 18, 2011 01:49 PM (+rSRq)

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