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   Good ${greeting_time}, Victor!   
      
   28 Jun 2021 21:07:18, you wrote to All:   
      
    VS> What if I had two IPv6-capable ISPs for my home, and a /64 or a /56   
    VS> from each of them? Is it possible to setup a backup link this way?   
      
   Yes.   
      
    VS> I know that my home router can advertise multiple global IPv6   
    VS> prefixes into the LAN, but how will LAN hosts failover to the   
    VS> backup gateway if the primary ISP fails? They will have IPv6   
    VS> addresses from both blocks, which should they choose for their   
    VS> outgoing src address?   
      
   This is the preferred mode of operation, but it has (only) two disadvantages:   
   1. All hosts in the LAN must be able to do the switching|balancing on thy own   
   (that means, run Linux; the BSD-style networking stack, like the one used in   
   Windoze, has very limited functionality).   
   2. This may require some manual configuration on every of them. Not really a   
   problem, but may be boring.   
      
    VS> With two IPv4 ISPs and NAT, the setup is rather trivial, outgoing   
    VS> connections will work via either of the ISPs because the hosts   
    VS> needn't be aware of the failure, and their src private IP is always   
    VS> the same. Can anyone enlighten me?   
      
   This is second option, but you'd lose the main advantage of IPv6: the use of   
   publicly routed addresses.   
      
      
   --   
   Alexey V. Vissarionov aka Gremlin from Kremlin   
   gremlin.ru!gremlin; +vii-cmiii-ccxxix-lxxix-xlii   
      
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