Specifying IPv6 off-link for a subnet

[Mel Pilgrim]

On 2021-07-20 7:20, Scott wrote:
> My need is pretty simple: to have FreeBSD servers with an IPv6 stack
> operating correctly on a private vLAN (IPPL).  Specifically an isolated
> private vLAN.
> 
> In IPv6 (as I understand it), this should be done by specifying that the
> prefix/subnet of the configured address is not on-link, and therefore should
> *always* use the router as the next hop.  (Similar to an NBMA network).

Off-hand, I'd try configuring vmx0 with xx::yy/128 and the router's 
link-local for the default route.  That should make the host forward 
everything via the router for the rest of xx::/64 without trying to do 
ND for it.

You might do better asking on freebsd-net about this.