3 ms·
> It just so happens that, unlike for v6, v4 and v4x have some "implicit bridges" built-in (i.e. between everything in v4 and everything in v4x that happens to
by throw0101d 7mo ago
> It just so happens that, unlike for v6, v4 and v4x have some "implicit bridges" built-in (i.e. between everything in v4 and everything in v4x that happens to have the last 96 bits unset).
See perhaps:
> For any 32-bit global IPv4 address that is assigned to a host, a 48-bit 6to4 IPv6 prefix can be constructed for use by that host (and if applicable the network behind it) by appending the IPv4 address to 2002::/16.
> For example, the global IPv4 address 192.0.2.4 has the corresponding 6to4 prefix 2002:c000:0204::/48. This gives a prefix length of 48 bits, which leaves room for a 16-bit subnet field and 64 bit host addresses within the subnets.
* https://en.wikipedia.org/wiki/6to4 https://en.wikipedia.org/wiki/6to4
Have an IPv4 address? Congratulations! You get entire IPv6 /48 for free.
- perennialmind 7mo agoAs I recall, 6to4 worked beautifully between 6to4 nodes in the absence of middlebox interference. The fatal flaw was the anycast address for accessing the "real" IPv6 network. The rosy outcome imagined in the article doesn't require a hypothetical IPv4 extension: just the novel idea of leaving the IPv4 core alone and extending the edge - which would have brought the financial incentives into alignment.