Comments: DNS lookups under Fedora Core 2

In general, you can check if IPv6 is enabled in the Linux kernel by checking the output of "lsmod"

lsmod | grep ipv6

If you get a hit, then IPv6 is probably enabled.

Posted by Darin Fisher at June 17, 2004 12:47 PM

Holy shit, this really is a *lot* faster! Thanks Darin!

Posted by bsander at June 18, 2004 1:42 AM

What if user does have ipv6 tunnel? What would happen? Also what about user that uses dns namecaching, will this affect them? I have both ipv6 tunnel and caching nameserver. Some sites seems to resolve quite quickly while others are quick.

Posted by Asun at July 2, 2004 11:36 AM

Opps, some are quick and some are slow. My mistake.

Posted by Asun at July 2, 2004 11:37 AM

> What if user does have ipv6 tunnel? What would
> happen? Also what about user that uses dns
> namecaching, will this affect them? I have both
> ipv6 tunnel and caching nameserver. Some sites
> seems to resolve quite quickly while others are
> quick.

If you are using IPv6, then I think you are out of luck :-/

A caching nameserver should definitely help.

Posted by Darin Fisher at July 8, 2004 9:01 AM

OK, I'm a real greenhorn here. I have the
"resolving host" issue with both Mozilla and Netscape, though it seems worse on Mozilla. I would truly appreciate a remedial description of how I might disable IPv6. I don't know what 'disabling in the kernel' means. thanks

Posted by sinc at July 19, 2004 6:50 PM

sinc, assuming you are running Linux, you can try disabling IPv6 using the command I gave above, i.e.:

echo "alias net-pf-10 off" >> /etc/modprobe.conf

You'll need to be logged in as root to run this command. After running this command, you'll need to reboot your system.

Posted by Darin Fisher at July 19, 2004 9:51 PM

My mistake. I am running windows98. I didn't realize this was a linux forum. I simply did a search on "resolving host", and this thread came up.
Any help w/ windows?

Posted by sinc at July 20, 2004 8:56 AM

Sinc,

Win98 does not have any ipv6 stack. Unless you have gone through all the trouble installing ipv6 stack for win98, slow resolve is not caused by ipv6.

Posted by Asun at July 20, 2004 4:07 PM

Asun,
Thanks for that info. What causes the same symptoms on my system that are described above?

Posted by sinc at July 20, 2004 5:04 PM