enable dhcpv6 server for kea on core machine

[sarcasticadmin]

Description

Relates to: https://github.com/socallinuxexpo/scale-network/issues/392

Kea config is currently only v4. Need to add our v6 version of the config.

Acceptance Criteria

• Kea service running on core provides dhcpv6 server
• Appropriate vm test to match

[nixinator]

Just our of curiosity, i thought V6 address were big enough so you don't need dhcp at all, and one less service is one less thing to go wrong?

[davidelang]

we are passing some parameters via dhcp, so those are still needed.

David Lang

On Wed, 22 Mar 2023, Lee Hughes wrote:

Just our of curiosity, i thought V6 address were big enough so you don't need dhcp at all, and one less service is one less thing to go wrong?

[sarcasticadmin]

@nixinator Yes @davidelang is correct. Ultimately we will be moving to passing the v4 options via v6.

IIRC @owendelong had some other use cases for this as well

[owendelong]

Yes... Sometimes you want a particular host to consistently get the same address. While EUI-64 sort of allows this, it's no longer default on the vast majority of systems. Using DHCP6 reservations provides a consistent way to manage these addresses.