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Supports dhcpv6 agent execution from pppoe0 interface
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The current dhcpv6 agent implementation cannot delegate agent operations to the pppoe interface prefix, such as the following directives:

listen-interface br1.2 {
    address FF02::1:2
max-hop-count 10
upstream-interface pppoe0 {
    address FF02::1:2

The expected behavior of the configuration is that the subordinate devices of br1.2 are expected to delegate requests to pppoe via the dhcpv6 prefix in order to complete the prefix delegate, but the actual situation is:

vyos@vyos# sudo /usr/sbin/dhcrelay -6 -pf /run/dhcp-relay/ -l FF02::1:2%br1.2   -u FF02::1:2%pppoe0  -c 10 -I
Internet Systems Consortium DHCP Relay Agent 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit
Bound to *:547
Listening on Socket/br1
Sending on   Socket/br1
Listening on Socket/eth5
Sending on   Socket/eth5
Listening on Socket/eth4
Sending on   Socket/eth4
Listening on Socket/eth3
Sending on   Socket/eth3
Listening on Socket/eth2
Sending on   Socket/eth2
Listening on Socket/eth1
Sending on   Socket/eth1
Listening on Socket/eth0
Sending on   Socket/eth0
Unsupported device type 512 for "pppoe0"

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Is it possible to consider using Kea DHCPv6 instead of ISC DHCPv6, or a better solution?


Difficulty level
Hard (possibly days)
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)

Event Timeline

jack9603301 changed the subtype of this task from "Feature Request" to "Bug".Feb 16 2021, 6:04 AM
jack9603301 renamed this task from Supports DCPV6 agent execution from PPPOE0 interface to Supports dhcpv6 agent execution from `pppoe0` interface.Feb 16 2021, 6:07 AM
jack9603301 updated the task description. (Show Details)
jack9603301 renamed this task from Supports dhcpv6 agent execution from `pppoe0` interface to Supports dhcpv6 agent execution from pppoe0 interface.Feb 16 2021, 6:09 AM
jack9603301 added a project: VyOS 1.3 Equuleus.

Maybe we should consider using a better proxy server to complete the dhcpv6 agent

Viacheslav changed Difficulty level from Unknown (require assessment) to Hard (possibly days).