TID: FMail-W32 2.1.3.7-B20170919
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TZUTC: 0200
CHRS: CP850 2
MSGID: 2:280/5555 61769f62
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Hello Scott,

On Sunday October 24 2021 11:23, you wrote to Victor Sudakov:

 SS> The gateway and my dozen+ devices do not seem to have any issues
 SS> getting dynamic IPv6 addresses, and since most are Apple, IPv6 is the
 SS> prefered connection method.  As an "end-user", I don't know why
 SS> Comcast has chosen to give my network MORE address space; like
 SS> 1800000000000000000+ addresses wasn't enough; they've given me
 SS> 295000000000000000000+ addresses.

Actually compared to other ISP they are a bit miserly. They only give you a
/60. My ISP gives me a /56 and many others issue a /48.

 SS> In reality, for an end user network, /96 is plenty with 2^32 addreses,
 SS> and /112 is even more reasonable with 2^16 addresses;  especially when
 SS> you compare it to the default settings on every consumer IPv4 gateway
 SS> with 2^8 addresses.

I understand what you are saying, but that is IPv4 think. IPv4 adresses are a
scarce commodity, so naturally one does not want to be wasteful with IPv4
adresses. But waste is only an issue when there is a shortage. With IPv6 you
have to let go of that way of thinking. There is no shortage of IPv6 adresses.
So there is no reason for avarice. IPv6 was designed so that one can use
simple adressing schemes. The block size for a LAN subsegment is a /64. That
allows for SLAAC addressing based on 64 bit MAC addresses. Your ISP gives you
16 of those /64 blocks. So you can create 16 subnets. One for your hobby LAN,
one for your bussiness LAN, one for your guest LAN and one for your domotics
LAN. And 12 more.

It will take a while but eventually you will get used to the idea that IPv4
think does not apply to the IPv6 world. ;-)


Cheers, Michiel

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