That depends which part of the stack you're working on. If you're writing web apps that receive a REMOTE_ADDR field, then the protocols look very similar; you

That depends which part of the stack you're working on. If you're writing web apps that receive a REMOTE_ADDR field, then the protocols look very similar; you just need to parse and store bigger values, and perhaps account for the fact that users tend to control a prefix instead of a single address. At the BGP and packet forwarding layers, everything's the same, with bigger numbers. The linked article relates to IPv6 over Ethernet, which is the area where IPv6 added the most new features and quirks.