REPLY: 2:5005/49 6174fdcc   
   MSGID: 1:266/420 617581ae   
   PID: GED+LNX 1.1.5-b20180707   
   CHRS: UTF8 2   
   TZUTC: -0400   
   TID: hpt/lnx 1.9.0-cur 2021-05-15   
   Hello Victor!   
      
   24 Oct 21 13:26, 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?   
      
    VS> Whatever Comcast's intentions, are you sure that a LAN with a   
    VS> prefixlen different from /64 will work properly? Will a non-standard   
    VS> prefix not break SLAAC and other things?   
      
    VS> This is where my theoretical knowledge is lacking, but I've always   
    VS> been warned against using anything different from /64 on a LAN   
    VS> segment.   
      
   The gateway and my dozen+ devices do not seem to have any issues getting   
   dynamic IPv6 addresses, and since most are Apple, IPv6 is the prefered   
   connection method.  As an "end-user", I don't know why Comcast has chosen to   
   give my network MORE address space; like 1800000000000000000+ addresses wasn't   
   enough; they've given me 295000000000000000000+ addresses.   
      
   In reality, for an end user network, /96 is plenty with 2^32 addreses, and   
   /112 is even more reasonable with 2^16 addresses;  especially when you compare   
   it to the default settings on every consumer IPv4 gateway with 2^8 addresses.   
      
   I found this nice table from IBM on IP address subnet masks: htt   
   s://www.ibm.com/docs/en/ts3500-tape-library?topic=formats-subnet   
   masks-ipv4-prefixes-ipv6   
   (its odd that they buried it in a tape library document, but almighty Google   
   found it! - Google KNOWS EVERYTHING!)  :)   
      
      
   Cheers,   
      
   Scott   
      
      
   ---   
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