On 2014-07-19 15:53, Niels Penneman wrote:
... but it has a prefix length of 128. Hence, the VMs cannot see each other.

My configuration explicitly specifies a prefix length of 64; what could
cause the prefix length to be set to 128 on the DHCPv6 client side?

DHCPv6 addresses have no prefix length, they are just an address, so always a /128. What you need to do is advertise a /64 prefix, but with the M bit set and the AUTOCONF bit disabled.

That way the hosts you want off the IPv6 network will be aware of the prefix, but won't have a global address on it.

Roy

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