dhcp6relay: T3596: Replace ISC DHCPv6 relay with wide-dhcp6-relay

[jack9603301]

Change Summary

Replace ISC DHCPv6 relay with wide-dhcp6-relay

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Code style update (formatting, renaming)
• [x] Refactoring (no functional changes)
• [ ] Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• [ ] Other (please describe):

Related Task(s)

• https://phabricator.vyos.net/T3596

Component(s) name

dhcp6relay

Proposed changes

I plan to use wide-dhcp6-relay to support DHCPv6 relay, which may break the limitation of ISC DHCP on PPPoE interface.

How to test

Since the test topology has not been designed yet, only packet capture test is carried out (to confirm whether DHCPv6 PD request packets are sent)

Checklist:

• [x] I have read the CONTRIBUTING document
• [x] I have linked this PR to one or more Phabricator Task(s)
• [x] I have run the components SMOKETESTS if applicable
• [x] My commit headlines contain a valid Task id
• [ ] My change requires a change to the documentation
• [ ] I have updated the documentation accordingly

[c-po]

Hi Jack,

I wonder why this is flagged only as refactoring bit you open an entire new CLI tree. I also wo der why this is now under the interface secrion and no longer under service.

Please explain in a more detailed manner.

[jack9603301]

@c-po

In fact, I designed it as fix at the beginning, but I found that it almost needs to modify the existing service logic (I can't reuse the old logic, I need to modify the CLI), so I changed it to refactoring

I also wo der why this is now under the interface secrion and no longer under service.

This is mainly because the configuration structure of the interface is convenient and friendly, and the PD configuration is in the same path. This is just a draft. If necessary, you can change the CLI

Traditionally, only one configuration is needed:

set interfaces ethernet eth0 dhcpv6-option dhcp6relay interface eth1

The above configuration takes eth0 as the upstream and provides services for eth1

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[dmbaturin]

We'll need to re-evaluate this in 1.5. Closing for now.