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added xcd

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Brian E Carpenter
2023-10-19 11:50:59 +13:00
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commit 23274478df

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## Addresses
A 128 bit address is big enough that, assuming the adoption of wise
allocation policies, IPv6 will never run out of addresses. However, the
allocation policies, IPv6 will [never](https://m.xkcd.com/865/)
run out of addresses. However, the
reason for choosing 128 rather than 64 was not just that: it was also to
allow for some intrinsic structure to addresses, as described below. On
the other hand, a *fundamental* property of IPv6 unicast routing is that