Re: system taking ages to resolve dns
Are you behind a router that serves as your local DNS server? If that's
the case, then you may have a similar situation as I had before. What
happened in my case was that the dhcp client set the domain to search to
the domain of my ISP and somehow through the router this didn't work
well. The way I fixed this was to remove the entries domain-name and
search-domain (? - I forgot the exact name, something with search) from
/etc/dhcp3/dhclient.conf. After this change, my /etc/resolv.conf did
not contain any more "domain" or "search" entries, and all my IP lookups
were blindingly fast.
Cheers,
Norbert
On Sun, Jul 05, 2009 at 05:25:24PM -0500, Hugo Vanwoerkom wrote:
> Florian Kulzer wrote:
>> On Sun, Jul 05, 2009 at 22:03:39 +1000, Daniel Dalton wrote:
>>> Hi,
>>>
>>> I just reinstalled debian this week. It has not solved my issue of
>>> resolving dns taking a long time. Basically the issue is: If I want
>>> to access a dns such as google, or debian.org, it takes for ever to
>>> resolve the dns. Whether I'm using firefox or lynx to browse the web
>>> or msmtp to send email, the resolving of dns is over 30 seconds. If I
>>> use the ip address though, access is almost instant. So what can I do
>>> to solve this problem? Only occuring on my debian system, windows
>>> vista on the same system works fine, and no one else on the network
>>> seems to have issues like these. The issue started happening when I
>>> got my new dsl2 modem (netgear, nb5). As I said I did a reinstall,
>>> and with the base system and testing with lynx, I found the problem
>>> pretty much the same. So how can I speed up dns resolution?
>>
>> Do you see any difference in the response time for the following two
>> queries?
>>
>> dig -t A debian.org
>>
>> dig -t AAAA debian.org
>>
>
> Florian, I get the following (edited) results:
>
> hugo@debian:~$ dig -t AAAA debian.org Query time: 130 msec
> hugo@debian:~$ dig -t AAAA debian.org Query time: 127 msec
> hugo@debian:~$ dig -t AAAA debian.org Query time: 129 msec
> hugo@debian:~$ dig -t AAAA debian.org Query time: 147 msec
> hugo@debian:~$ dig -t AAAA debian.org Query time: 135 msec
> hugo@debian:~$ dig -t AAAA debian.org Query time: 129 msec
> hugo@debian:~$ dig -t AAAA debian.org Query time: 145 msec
> average 134.5
> hugo@debian:~$ dig -t A debian.org Query time: 151 msec
> hugo@debian:~$ dig -t A debian.org Query time: 177 msec
> hugo@debian:~$ dig -t A debian.org Query time: 150 msec
> hugo@debian:~$ dig -t A debian.org Query time: 152 msec
> average 157.5
>
> so dig -t AAAA debian.org is on the average 157.5-134.5=23 ms faster.
>
> What does that mean?
>
> Hugo
>
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