[ipv6-wg] End-host IPv6 address allocation on Carrier Ethernet

> #2 - use SLAAC and don't care
> =============================
> Consumer hosts will get random IPv6 addresses out of your Carrier Ethernet
> /64 prefix. Can you afford the "don't care" part of it?

We provide a static /64 with SLAAC per connection, but allow static addresses within that /64 as well. Connections are provisioned as individual router subinterfaces, so user-to-address mapping happens on subnet level and URPF prevents spoofing. This naturally works only as long as you have a single customer/connection per VLAN, not so much with group-VLANs (which are shared by several connections). With SLAAC you can dig the MAC address from the IPv6-address, if necessary (MAC-spoofing can be a problem, but that's the case with DHCP and IPv4-world as well. ND-attacks are an issue as well.)

The shortcomings with this approach include:
- doesn't work with group-VLANs
- the end-user has to configure DNS-servers manually

____________________________________
Tero Toikkanen
Network Engineer
Nebula Oy