On 30 April 2017 at 22:02, Pieter De Wit
The /64 linknet allows us to use SLAAC instead*** of DHCPv6, which is something that sits better with the networking guys :)
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*** I am sure that you could use DHCPv6 too, but SLAAC "sounds" like less work from an Admin point of view
If you want even less work, you could use neither on the WAN, just let them use link-local. Obviously still using stateful DHCPv6 to assign PDs for use behind the CPE. Most CPEs (IME YMMV etc), can be configured to use an IP from the PD to source traffic from. We did this initially to help alleviate host resource usage on the 7750, (3x hosts for dual stack, one for the IA_NA, IA_PD, and v4) however the newer versions of SROS have collapsed the v6 host resources into one, so this is now moot. But as we've had no issues with this in our deployment, other than the perceived scariness of not having a GUA address on the "WAN interface", we're sticking with it. -Richard