>>
>> IPv4 works OK, IPv6 gives that
>>
>> ne0: DAD detected duplicate IPv6 address fe80:0001::b2c4:20ff:fe00:0: 1
>> NS, 0 NA
>> ne0: DAD complete for fe80:0001::b2c4:20ff:fe00:0 - duplicate found
>> ne0: manual intervention required
>>
>> and doesn't work..
>>
>> any idea?
>
> What it said.
>
> The emulated ne0 apparently uses the same interface identifier as the
> real one, which doesn't work.

no i doesn't

server has
00:08:c7:9c:34:18 while emulated bochs's ethernet b0:c4:20:00:00:00

i just checked it with IPv4's arp table to be sure.

>
> As a workaround, give it a non-globally-unique interface identifier (I think
> by setting the link-local address with ifconfig ... like:
>
> ifconfig ne0 fe80::1 up)
>
> If it works after that, put an "fe80::1 up"  into /etc/ifconfig.ne0

setting ANYthing gives the same