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by throw0101a
1592 days ago
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> 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). |
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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.