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IPv6 Netowrk Device Numbering BP

In article <xs4all.CALgc3C7ngGpkRNYaCgN_ACY28uPFbM=KRnACsW0Jg=YsLuQHhQ at mail.gmail.com> you write:
>For simplicity and a wish to keep a mapping to our IPv4 addresses,
>each device (router/server/firewall) has a static IPv6 address that
>has the same last digits as the IPv4 address, only the subnet is
>You can say it's a IPv4 thinking model, but it's easier to remember
>that if the fileserver it's at then it's IPv6
>counterpart address would be 2001:abcd::192:168:10:10 (each subnet
>being a /64)

We use a /120 subnet for servers to prevent the NDP cache exhaustion
attack. We do maintain a mapping between IPv4 and IPv6 addresses;
it's simply 2001:db8:vv:ww::xx, where xx is the hex value of the
last octet of the IPv4 address.