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Bug#613687: general: ipv6 acquitment problem - causes problems in ipv4



On Wed, Feb 16, 2011 at 05:22:42PM +0100, frenchippy@free.fr wrote:
> I encountered a problem while using IPv6 : on non-local networks, the
> bandwidth is dramatically low, around 8 Kb, while having around 10Mb if
> deactivating ipv6.

The "general" package won't get you help from the people who
actually know about IPv6 issues.  I'm by no means an expert, so
please take this advice as it is, it's not necessarily specific to
your problem.

The most likely explanation for what you are seeing is that there
is a problem with your local network.  We can't really help you
with that.

One known source source of slowdowns with misconfigured IPv6
setups is slow name resolution, which slows down making a
connection:

  https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/313218
  https://bugzilla.redhat.com/show_bug.cgi?id=459756

However, in your case this is probably not applicable; the above
won't affect the speed of a connection once established.

Are your IPv4 and IPv6 connections of the same speed?  If not,
and the v6 connection is tunnelled, throttling at the tunnel
endpoint might be an issue.  I've certainly had fairly
slow/unresponsive connections at times due to this.

If it's geninely a problem with networking on Linux, I think you
should get in touch with the linux-kernel folks.  The netdev list
at vger.kernel.org might be a good place to start.


Regards,
Roger

-- 
  .''`.  Roger Leigh
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