[Kea-users] DHCPv6 relay and ff05::1:3

[Eric Graham]

Hi Joe,

I realize you're having a specific issue, but for others and also to help troubleshoot, here's how I configure dhcrelay on Almalinux 8:
---------------------------------------------------------------

  1.  Install dhcp-relay
  2.  Copy /lib/systemd/system/dhcrelay.service to /etc/systemd/system/dhcrelay6.service
  3.  Edit the service with systemctl edit dhcrelay6.service​:
     *   [Service]
ExecStart=
ExecStart=/sbin/dhcrelay -d --no-pid -6 -l $YOUR_IFACE_FACING_CLIENTS -u $YOUR_IFACE_FACING_KEA

  1.  Reload the systemd daemon and (re)start the dhcrelay service.

For the Kea side, can you show your config, and logs? Inside my shared networks list, I have the following, emphasis on the "relay" object:
---------------------------------------------------------------
{
  "name": "Dummy DHCPv6",
  "valid-lifetime": 600,
  "relay": {
    "ip-addresses": [ "ff05::1:3" ]
  },
  "option-data": [
    { "name": "domain-search", "data": "your-domain.internal" }
  ],
  "subnet6": [
    {
      "subnet": "2001:db8::/40",
      "pools": [
        { "pool": "2001:db8::f - 2001:db8::fffe" }
      ],
      "pd-pools": [
        {
          "prefix": "2001:db8:100::",
          "prefix-len": 40,
          "delegated-len": 56
        }
      ]
    }
  ]
}



Eric Graham

DevOps Specialist

Main: 605.995.1777

Eric.Graham at Vantagepnt.com<mailto:Eric.Graham at Vantagepnt.com>


[cid:1524c423-e517-4064-b2dd-48795c13b27e]


Mitchell | Portland | Colorado Springs | San Antonio | Sioux Falls | Springfield | Charlotte

________________________________
From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Joe Botha <joe at swimgeek.com>
Sent: Monday, December 12, 2022 8:54 AM
To: kea-users at lists.isc.org <kea-users at lists.isc.org>
Subject: [Kea-users] DHCPv6 relay and ff05::1:3

CAUTION: This email originated outside the organization. Do not click any links or attachments unless you have verified the sender.

Hi

Busy setting up a dhcpv6 server and relay, using Kea 2.2 and ISC dhcrelay 4.4.1.

Kea DHCPv6 server listens on:
udp6 ff02::1:2 port 547

but ISC dhcrelay sends to:
ff05::1:3 port 547

I can’t seem to tell kea to listen on ff05::1:3, and I can’t seem to tell dhcrelay to send to ff02::1:2.

Am I missing something?

--
Swimmingly,
 Joe

swimgeek.com/blog  +27 82 562 6167  instagram.com/joe.swimgeek
      "...all progress depends on the unreasonable man.”




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