David Shultz wrote:
> Whenever I browse any website, mozilla says
> "Resolving www.google.com <http://www.google.com>" and waits for about
> 15 seconds to resolve the host. I've disabled
> ipv6 but the problem is still there. Also I've
> checked the isp nameserver and they are fine.
> Does anyone has the same problem?
>
> --David
This sounds like it could be a couple of things that I have run into.

First, it could be an mDNS(multicast dns) problem. That gave me fits
for a while.

I cured it one by uninstalling avahi-daemon, as I don't have use any
software that relies on this function(I did this just to stop an
unnecessary daemon), and also editing my /etc/resolv.conf file so it
didn't contain a line that used the word "local". This word being in
resolv.conf is/was a bug in Avahi-daemon, IIRC, that caused all DNS
lookups to be run as mDNS lookups first, and then go to the nameserver
picked up through dhcp, or in /etc/network/interfaces if you're using
static ip addresses, when the mDNS queries finally time out.

Second was the ipv6 lookups. I fixed that by blacklisting the ipv6
module and all those extraneous dns queries disappeared.

The way I found the mDNS problem with extremely long url resolution
times was to start an ethereal/wireshark packet capture, and then fire
up my browser. That's when I found that all dns queries were going to
224.0.0.xxx (mDNS).

I think the bug is now fixed as I just reinstalled a laptop a few days
ago and I didn't have to make any changes in resolv.conf. DNS worked
correctly from the very first, and that hadn't happened with any Etch
installs I'd done in the last month or so.


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