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The current CLI did not support multiple prefix-delegations per interface. Some
ISPs only send one /64 to a client per prefix-delegation request, but they
allow the customer to request multiple prefixes.
The 'dhcpv6-options prefix-delegation' node has been renamed and converted to a
tag node named 'dhcpv6-options pd'. The tag node specifies a PD request (>=0).
In the past the user needed to know what prefix will be assigned and required
to calculate the sla-len by himself. The 'sla-len' node was dropped and is now
calculated in the background from the 'dhcpv6-options pd 0 length' node.
It is no longer mandatory to supply the 'sla-id' node, if sla-id is not
specified it is 'guessed' by counting upwards.
Example configuration:
----------------------
ethernet eth1 {
address dhcpv6
dhcpv6-options {
pd 0 {
length 56
interface eth2 {
address 1
}
}
}
}
This will request a /56 assignment from the ISP and will delegate a /64 network
to interface eth2. VyOS will use the interface address ::1 on the delegate
interface (eth2) as its local address.
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Commit 21bc98f1 ("ifconfig: dhcp: T2767: client must not start when
interface is disabled") dropped dhcp.py which is now directly handled by
interface.py. This change should also be reflected in the generated files.
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This removes additional code paths as we can instatly work with the input dict
the same was as it was done for PPPoE. This fixes the entire DHCPv6-PD support
on non PPPoE interfaces as this was lost in translation while processing T2653.
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Some ISPs (e.g. Comcast) only delegate a /64 by default. You have to explicitly
"ask" for a bigger (e.g. /60) prefix. This commit adds a CLI node to request
a specific prefix length in the range 32 - 64.
dhcpv6-options {
prefix-delegation {
length 60
}
}
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Rename the CLI nodes for prefix delegation from "dhcpv6-options delegate
<interface>" to "dhcpv6-options prefix-delegation interface <interface>".
The change is required to add the possibility to request for specific prefix
sized via the CLI. That option was not possible with the old configuration
tree.
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The following configuration will assign a /64 prefix out of a /56 delegation
to eth0. The IPv6 address assigned to eth0 will be <prefix>::ffff/64.
If you do not know the prefix size delegated to you, start with sla-len 0.
pppoe pppoe0 {
authentication {
password vyos
user vyos
}
description sadfas
dhcpv6-options {
delegate eth0 {
interface-id 65535
sla-id 0
sla-len 8
}
}
ipv6 {
address {
autoconf
}
enable
}
source-interface eth1
}
vyos@vyos:~$ show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
eth0 2001:db8:8003:400::ffff/64 u/u
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ISC does not support running the client on PPP(oE) interfaces which makes it
unusable for DHCPv6 Prefix Delegation tasks.
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Unsupported device type 512 for "pppoe0"
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