REPLY: 2:5020/545 60da34cd   
   MSGID: 2:5005/49 60db3242   
   CHRS: CP866 2   
   TZUTC: 0700   
   TID: hpt/fbsd 1.9.0-cur 2019-12-05   
   Dear Alexey,   
      
   28 Jun 21 23:45, you wrote to me:   
      
    VS>> What if I had two IPv6-capable ISPs for my home, and a /64 or a   
    VS>> /56 from each of them? Is it possible to setup a backup link this   
    VS>> way?   
      
    AV> 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?   
      
    AV> This is the preferred mode of operation, but it has (only) two   
    AV> disadvantages: 1. All hosts in the LAN must be able to do the   
    AV> switching|balancing on thy own (that means, run Linux; the BSD-style   
    AV> networking stack, like the one used in Windoze, has very limited   
    AV> functionality). 2. This may require some manual configuration on every   
    AV> of them. Not really a problem, but may be boring.   
      
   This is not feasible because most of those LAN hosts are smartphones, smart   
   TVs, vacuum cleaners, cameras and other IoT devices.   
      
    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   
    VS>> always the same. Can anyone enlighten me?   
      
    AV> This is second option, but you'd lose the main advantage of IPv6: the   
    AV> use of publicly routed addresses.   
      
   Indeed. I don't like the idea of using NAT in IPv6 even if I could. So what's   
   the solution?   
      
   Victor Sudakov, VAS4-RIPE, VAS47-RIPN   
   --- GoldED+/BSD 1.1.5-b20170303-b20170303   
    * Origin: Ulthar (2:5005/49)   
   SEEN-BY: 1/123 30/0 50/109 80/1 90/1 105/81 120/340 123/131 154/10   
   SEEN-BY: 221/1 6 226/30 227/702 229/424 426 550 700 1016 240/1120   
   SEEN-BY: 240/5832 249/206 317 400 261/38 280/464 5555 282/464 1038   
   SEEN-BY: 301/0 1 101 113 812 317/3 322/757 342/200 460/58 463/68 467/239   
   SEEN-BY: 467/888 633/280 712/848 920/1 5000/111 5001/100 5005/49 53   
   SEEN-BY: 5015/46 5020/715 830 846 1042 2047 2140 4441 5053/54 5058/104   
   SEEN-BY: 5064/56 5083/1 444   
   PATH: 5005/49 5020/1042 301/1 229/426