On 11/12/24 10:49, Lew Wolfgang wrote:
Yes, routers advertise themselves in v6. We had one spate of problems where Windows users could accidentally set up their boxes to issue RA's to a dead interface. Sure, a rogue DHCP server could be set up on v4, but not accidentally.
How does one "accidentally" send out RAs, without also "accidentally" setting up a router? That would be even more difficult to do in Windows than Linux.
No, it's using 100.64.0.0/10 when not connected to my local NATed WiFi.
Then they are just using NAT, instead of some transition mechanism such as 464XLAT. That block is allocated to carrier grade NAT.
CIDR can't supply all needed addresses, true. It can provide something like 3,000,000,000 unique addresses net. Yet there are estimated to be 20,000.000.000 devices currently connected. Sure, some of those are IPv6, but I bet many more are IPv4 NATed. I've got about 20 devices here hiding behind one v4 address, and don't have any issues with our use cases.
As I mentioned, IPv6 is mandatory on 4G & 5G. The carriers can optionally provide IPv4, as yours does. Incidentally, when I tether to my cell phone, I get a public IPv6 address along with NAT IPv4.