Originally Posted by
Yagisan
From the ubuntu-devel mailing list (culled from a variety of posts)
Originally Posted by ubuntu-devel list
Having IPv6 be the cause of 'slow' connection is actually a common
misconception, reinforced in that disabling some IPv6 features may help
mitigate the problem, in most cases it is the result of bad network
configuration.
IPv6 itself does not in any way slow down your connection, problems will
arise however if you have a route out to the IPv6 internet but it is not
operational, as the browser will try to connect and it will take a while
to time-out, note this would also happen with a bad IPv4 internet
connection.
Another cause in the past has been bugs in programs (e.g. mozilla) that
do the wrong thing internally, most of the major problems here have been
fixed.
As above, these issues would *only* happen if the website you are trying
to connect to has an IPv6 address associated. Another cause can be
having an IPv6 name-server configured in resolv.conf or similar, in
which case the problem would arise if you were trying to connect to
*any* address.
Most people do not have a problem with having IPv6 enabled, it
simply is un-used when not in use.
If you are having problems, it is likely due to some kind of
misconfiguration, you would need to diagnose that.
In particular, the commands 'ip -6 route' may help, it will indicate if
you have any routes to the broader IPv6 world (look for '2000::/3' and
'default' routes). THis may be caused by an incorrect router on your
network, or by using tunneling software (such as tspc from
freenet6.net), or a number of other reasons.
In simpler terms: with a default Ubuntu install, if you're not using
IPv6, you shouldn't even know it's there. If you're experiencing
negative side effects, they're likely the result of a broken application
or incorrect configuration. Firefox, for instance, is a known culprit.
One thing you can try is, with IPv6 enabled, to launch a terminal, and
type 'host www.google.com'. If the command succeeds quickly, listing
Google's IPs, then you're not having general network connectivity
trouble, and you can start filing bug reports against whichever specific
applications are being slow.
My suggestion to all those with "slow" internet. Try the last paragraph especially, then start filling bug reports.
Bookmarks