Now, since we’re using bridged routing, we need to adjust the guest.

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auto eth0
iface eth0 inet static
        address 78.46.37.114
        netmask 255.255.255.255
        pointopoint 78.46.37.118
        gateway 78.46.37.118
        post-up ping -c2 78.46.37.118 &>/dev/null

iface eth0 inet6 static
        address 2a01:4f8:110:3148::5
        netmask 64
        gateway 2a01:4f8:110:3148::2
        post-up ping6 -c2 2a01:4f8:110:3148::2 &>/dev/null

This’ll take care of the bridged routing and the ICMPv6 announcement to the host. Without the ping/ping6, guest and host won’t be able to communicate (no clue why).