IPv6 end user addressing
joelja at bogus.com
Sun Aug 7 17:41:23 CDT 2011
On Aug 7, 2011, at 3:09 PM, Jonathon Exley wrote:
> This has probably been said before, but it makes me uncomfortable to think of everybody in the world being given /48 subnets by default.
> All of a sudden that wide expanse of 2^128 IP addresses shrinks to 2^48 sites. Sure that's still 65535 times more than 2^32 IPv4 addresses, but wouldn't it be wise to apply some conservatism now to allow the IPv6 address space to last for many more years?
2000::/3 is 1/8th of the address range. There are other things worth conserving not just /48s like the ability aggregate your whole assignment. 3.5 * 10^13 is a lot of /48s, but it's likely not enough so we'll get to crack the seal on 4000::/3 eventually and so on.
> After all, there are only 4 bits of IP version field so the basic packet format won't last forever.
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