On 21/09/16(Wed) 23:24, Heiko Zimmermann wrote:
> Hello Martin,
> 
> the Infos you wanted:
> 
> 176.9.157.65                         78:fe:3d:46:ed:9d    re0 4m54s

Which computer is that?  IPv4 doesn't help.  We're dealing with IPv6.

This MAC address is the one that ends up in your fe80::%re0 route on 6.0
and doesn't in current.  The question is *why*?

> ##################################################################
> 
> # sysctl net.inet6.icmp6.nd6_debug=1
> net.inet6.icmp6.nd6_debug: 0 -> 1

Please use 8 or higher, put that in your sysctl.conf and look at which
error message you get in /var/log/messages

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