Hi folks!
I’m using PicOS L3 switches to relay DHCPv6 requests to a Kea server. My server
is set up like this:
{
"Dhcp6": {
"interfaces-config": {
"interfaces": ["internal/fde1:8a58:60b7:c23c::10"]
},
…
"subnet6":
[
{
"subnet": "2604:2940:8000:8::/64",
"rapid-commit": true,
"pools": [ { "pool": "2604:2940:8000:8::/80" } ],
"pd-pools": [
{
"prefix": "2604:2940:8000:2800::",
"prefix-len": 54,
"delegated-len": 60
}
],
"reservations": []
},
…
The PicOS relay sends data that looks like this:
08:57:19.802158 internal In IP6 (flowlabel 0x2c0ee, hlim 63, next-header UDP
(17) payload length: 167) 2604:2940:8000:8:0:ffff:ffff:fffe.547 >
fde1:8a58:60b7:c23c::10.547: [udp sum ok] dhcp6 relay-fwd (linkaddr=ff02::1:2
peeraddr=fe80::f4fa:c4ff:fe8c:f5d3 (interface-ID 000007d0...) (Remote-ID 35098
666c336e77...) (relay-message (dhcp6 solicit (xid=9de569 (client-ID hwaddr type
1 f6fac48cf5d3) (IA_NA IAID:3297572307 T1:4294967295 T2:4294967295)
(option-request DNS-server vendor-class) (elapsed-time 65535) (vendor-class)
(IA_PD IAID:3297572307 T1:4294967295 T2:4294967295))))
It's using the IPv6 address assigned to the VLAN associated with the request as
the source of the relayed message (2604:2940:8000:8:0:ffff:ffff:fffe), but does
not update the ‘linkaddr’ field with that message. I have not yet been able to
find a way to adjust the ‘interface-id’ field, so I can’t change that to link
to a subnet in Kea. And the value that gets set by PicOS doesn’t seem to be
ASCII, so I haven’t found a way to specify that in the subnet declaration in
Kea as hex (if that would make sense to do).
I can adjust the ‘remote-id’ field sent by PicOS (by default it’s omitted, but
I have it set in the request above), but I haven’t found a way in Kea to use
that as the primary subnet selection criteria. From what I can see, I could use
that as part of a class to further filter requests once the subnet is selected,
but that’s not what I need.
Is there any way to configure Kea to use the source address of the relay packet
or the ‘remote-id’ as the subnet selection criteria? I also have a request open
with FS (who own PicOS) to have them adjust the `linkaddr` field, but I don’t
know if they will do that or how long that will take.
-Justin
--
ISC funds the development of this software with paid support subscriptions.
Contact us at https://www.isc.org/contact/ for more information.
To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
Kea-users mailing list
Kea-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/kea-users
