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IPv4 is a subset of IPv6! They literally invented a way to map from an IPv4 address to IPv6 with a special prefix.
by growse 9y ago
IPv4 is a subset of IPv6! They literally invented a way to map from an IPv4 address to IPv6 with a special prefix.
- convolvatron 9y agowth happened with that, in the original proposal it was 96 bits of zero, then that was deprecated, and then they added :ffff:0:0 with the same functionality
- wyufro 9y agoNo, they have different functions. Sending to ::1.2.3.4 would send an IPv6-in-IPv4 packet to 1.2.3.4. Using ::ffff:1.2.3.4 tells the OS that you want to send a proper IPv4 packet and no IPv6 is used on the wire. I don't know why the former was deprecated, but I think almost no OS supported it so might've been just that.
- Avernar 9y agoThe former was depricated because the automatic tunneling transition method was depricated and none of the current IPV6 transition methods use them. Now some software use those addresses to store IPV4 addresses in the same memory as an IPV6 address.