Linux + IPv6 = slow internet?

For the past few weeks, I've been getting very slow internet access under Linux, but perfectly fine under Windows. In particular, latency of TCP connections is very high - Firefox can sit around trying to "look up" a website for 30+ seconds. Same applies for e.g. downloading packages via HTTP or FTP with the package manager. Ping times OTOH are normal.

After investigating some package downloading issues on my Arch-powered Thinkpad, I eventually found a workaround: disabling IPv6 on my Linux machines. This brings the latency down to something reasonable.

However, Windows 7 (with full IPv6 support, AFAIK) does not suffer from this issue at all.

What's going on? Is there something buggy about the way Linux implements IPv6? Any way to fix it without completely disabling the newer protocol?

Not "solved" exactly, but I have found a workaround: switching to Google's public DNS servers. Probably not the healthiest thing from a privacy standpoint, but hey, it's not like I have a pressing need to conceal myself (yet).

[moontan]

i don't have any problems with my connection, fwiw.

i don't even know if i am using IPv6 or not.

[Ocky]

Some sites to check whether you are connecting via ipv4 or ipv6.

Logo animation sites
http://www.kame.net/ - Dancing Turtle

Shows your IPv6 and IPv4 address
http://www.whatismyipv6.net/
http://whatismyv6.com/
http://www.runningipv6.net/what-is-my-ipv6-address.php

How to Disable IPV6 in Ubuntu

[moontan]

tnx Ocky.

i am apparently still on Ipv4 and i timed out trying to connect to Ipv6.
so indeed there seems to be a problem.