Do ISPs really give out /128s? That's, erm, that's monstruous! Mine gives a /60 but their router doesn't have any way to use it, which is a bit shit. Still, 10 gigs symmetric...
Bell, on the other hand, gives a big fat /nothing and doesn't support IPv6. I don't understand how they can roll out 1.5Gbit FTTH but refuse to support IPv6. Their mobile network uses it, of course, so it's truly perplexing.
Meanwhile Teksavvy, who piggybacks over Bell's copper and is also using PPPoE for DSL 'logins', has been giving out IPv6 for a couple of years now.
8 bits of subnetting means you can create up to 256 different subnets.
- Spectrum gave me /64.
- Comcast gives me /128.
No such issues with v4.
That was my point about subnetting.
The /128 is given to any clients that connect as there is no NAT and the ISP isn't worried if I use a thousand addresses.
A /64 is not enough for that. You can still create your own subnets, but you will be on your own with address assignment
Comcast for example right now is giving me a /128 for my router, and a /60 which I have used to set up multiple VLAN's.
Spectrum will give you a /56 in a prefix delegation, and a /128 for the router.