I note that some ISPs and organizations are not using /64 block in IPv6 router link or IPv6 peering.
Unlike IPv4 which normally has a subnet mask of /30 in router link for reserving the available IPv4 addresses , there is no need to make the subnet mask as /126 in IPv6. Just use /64 will be good enough and this is the default in a basic network segment. Put it another way, this is not a waste IPv6 addresses but an industry norm.warrenkwok
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