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   IPV6      The convoluted hot-mess that is IPV6      4,612 messages   

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   Message 3,562 of 4,612   
   Victor Sudakov to All   
   Two ISPs and backup for a home network (   
   28 Jun 21 21:07:18   
   
   MSGID: 2:5005/49 60d9d79a   
   CHRS: CP866 2   
   TZUTC: 0700   
   TID: hpt/fbsd 1.9.0-cur 2019-12-05   
   Dear All,   
      
   What if I had two IPv6-capable ISPs for my home, and a /64 or a /56 from each   
   of them? Is it possible to setup a backup link this way?   
      
   I know that my home router can advertise multiple global IPv6 prefixes into   
   the LAN, but how will LAN hosts failover to the backup gateway if the primary   
   ISP fails? They will have IPv6 addresses from both blocks, which should they   
   choose for their outgoing src address?   
      
   With two IPv4 ISPs and NAT, the setup is rather trivial, outgoing connections   
   will work via either of the ISPs because the hosts needn't be aware of the   
   failure, and their src private IP is always the same.   
      
   Can anyone enlighten me?   
      
   Victor Sudakov, VAS4-RIPE, VAS47-RIPN   
   --- GoldED+/BSD 1.1.5-b20170303-b20170303   
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