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* antlists@××××××××××××.uk: |
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> An ISP will then be allocated the next 16 bits, giving them a 32-bit |
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> address space to allocate to their customers - each ISP will have an |
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> address space the size of IPv4?! |
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ISPs can ask for several address spaces, each of which had a much, |
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*much* larger address space than the whole of IPv4. My ISP (Deutsche |
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Telekom) assigns /56 Subnets to Home Routers. Given that an IPv6 address |
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encompasses 128 Bits, each household is thus provided with an address |
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space of 2^(128-56) Bits. The whole of IPv4 spans only 2^32 Bits. |
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Any halfway decent data center should, at least, hand out /64 Subnets |
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for each and every hardware server and VM, free of charge. With virtu- |
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alisation becoming mainstream, I'd prefer to have a /56 for the host |
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server, so I can assign /64 subnets to each VM. |
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A wider address space does not mean one makes use of every available |
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address, of course. It just makes routing that much simpler, and there |
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is no need for silly stuff like NAT. |
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-Ralph |
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