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

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   Message 3,753 of 4,612   
   Scott Street to Victor Sudakov   
   A small questionary on ISPs   
   23 Oct 21 15:24:54   
   
   REPLY: 2:5005/49 617405a2   
   MSGID: 1:266/420 61746324   
   PID: GED+LNX 1.1.5-b20180707   
   CHRS: UTF8 2   
   TZUTC: -0400   
   TID: hpt/lnx 1.9.0-cur 2021-05-15   
   Hello Victor!   
      
   23 Oct 21 19:51, you wrote to me:   
      
    SS>>     inet6 2601:48:c500:9340::c0e3 prefixlen 60 dynamic   
      
    VS> This is very interesting. Why "prefixlen 60" on the LAN?   
      
   Perhaps - an educated guess here - Comcast's provided gateway has,   
   potentially, 4 internal LAN interfaces.  It could be configured with a 5GHz   
   WiFi subnet, a 2.4GHz one, the GbE ports, and a 'Xfinity Home' port.   I   
   haven't investigated what the "Home" port is used for, but that may explain   
   the breaking down of the /64 to /60.  Again, just a theory.   
      
   I'd tinker with the gateway to see if that is true; but, I think I've broken   
   enough things this week.  I just spent the last 48 hours recovering my VM   
   server from an 'upgrade' that would break my primary network interface on the   
   server. (The first 36 trying to figure out the problem and 'fix' it, the   
   remaining 12 hours rebuild and restore.)   
      
      
   Scott   
      
      
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