Slow DNS Lookup (and no IPv6-issue???)

Hi,

my dns lookups take several (~ 6-10) seconds every time. I tried a lot
of things, but now I ran out of ideas. What I tried up to now is:
- Deactivate IPv6: The most common advice about slow dns lookups
didn't work in my case. IPv6 is already successfully deactivated (at
least "lsmod | grep ipv6" claims that), but the problem continues.
Also deactivation IPv6-lookups for certain programs (like firefox or
ssh) doesn't help.
- Use other nameservers: Changing the nameserver in /etc/resolv.conf
to other ones didn't change anything as well. Besides, the original
nameservers are working well on other systems!
- Adding "option timeout:1" to or removing "domain ..." or
"search ..." lines from the /etc/resolv.conf file: Also didn't help...

Any further ideas?

Thanks!
Chris

PS: Distro "Debian Lenny Amd64" out of the box, only ndiswrapper
installed and WLAN configured
.

Relevant Pages

  • Re: Delayed DNS server response ...
    ... never used IPv6 DNS lookups even on IPv6-enabled systems. ... Besides, if you watch closely the result of Albrecht's ping test, you will see that the delay in twice as in the nslookup test, meaning that both direct and reverse DNS lookups are delayed. ... However a reverse lookup is just a standard PTR query and has nothing to do with IPv6. ...
    (comp.os.linux.networking)
  • Re: [FC3] Sites disappearing from DNS
    ... > you turned off IPv6? ... IIRC firefox had issues timing out DNS lookups via ...
    (Fedora)
  • RE: Strange IPv6 DNS lookups
    ... Try to fully disable IPv6 while adding: ... Several of our RHEL-servers are issuing strange DNS lookups. ... Is there a way to disable IPv6 lookups? ...
    (RedHat)