> The Ipv6 pool is quite vast. Yet I am a little surprised that an individual can receive a /48 without much trouble: that a lot of IPs.
A /48 is considered one "site" in current thinking. Since IPv6 subnets are /64, you have 16 bits between the /48 and the /64. This is the equivalent of using 10/8 for your network and using /24 IPv4 subnets: in both cases you can have upto 2^16 subnets.
The main difference being that a /24 can have ~250 hosts, but a /64 IPv6 subnet can hold the equivalent of four billion Internets (2^32 * 2^32).
But one of the selling points of IPv6 is reducing/eliminating the mental math about worrying about if you have "enough" addresses (and then carving things into /26, /30, etc).
> A /48 is considered one "site" in current thinking.
This is the really important part. As they continue to hand out IPv6 like candy, the minimum prefix length will get shorter.
No ISP wants a hundred million+ routes in their routing table, so people will start to drop anything shorter than a /42, /40, /38, etc. until the table gets small enough and shunt everyone elses traffic off to Hurricane Electric or the like as a default route.
People have this mindset of "we added a bunch of zeros, its an infinite resource now!" which is how we ended up in this mess to start with.
What is your basis for this opinion? Network operators are already talking about it.
> Too late. IPv4 are set to hit 1024K (2^20) in January 2024 at current trends
Allow me to expand that number for you: 1,048,576
One million. A reasonable upper bound for max announced v4 prefixes is somewhere around two million. You can handle that in a few GB of RAM. IPv6 could see 100x or 1000x that number based on how we are handling allocations, at which point prefix trimming will happen.
A /48 is considered one "site" in current thinking. Since IPv6 subnets are /64, you have 16 bits between the /48 and the /64. This is the equivalent of using 10/8 for your network and using /24 IPv4 subnets: in both cases you can have upto 2^16 subnets.
The main difference being that a /24 can have ~250 hosts, but a /64 IPv6 subnet can hold the equivalent of four billion Internets (2^32 * 2^32).
But one of the selling points of IPv6 is reducing/eliminating the mental math about worrying about if you have "enough" addresses (and then carving things into /26, /30, etc).