alt Hacker NewsWithout nat, my understanding is the right way in v6 is to issue addresses of every network and then send a message to each end device asking it to use a specific ip address to route traffic and hope every client implements RFC 4191 in the right way.
There's a few options I'm aware of.
The "proper" way would be to get your own ASN and use BGP to route the traffic.
If you're wanting to use a secondary WAN link as a backup for when the other goes down you could have the backup link's LAN have a lower priority. (So I guess hope everything implements RFC 4191 like you said).
You can use NAT66/NPTv6 if you want (though it's icky I guess).
How are you doing it currently?