Hi,

I am seeing the same issue as reported here:

http://www.sandelman.ca/mcr/blog/2010/09/08

The ipv6 code within the uml is doing Duplicate Address Discovery and the mcast
is seen back so it mistakenly believes the IPv6 address is already taken. The
address is stuck in "tentative" and the uml cannot even ping its own IPv6 
addresses.

There was some mentioning of a fix at:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508460

which mentions this commit:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e3ec6cfc260e2322834e200c2fa349cdf104fd13

But after upgrading host and uml kernel to 2.6.38 I am still seeing the 
duplicate address errors.

Did anyone get IPv6 working with uml mcast?

Paul

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