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Sometimes a modem might give a local IP before it retrieves a WAN IP.
This can be an issue with failover routes,
since the default route will get overridden.
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Some might want to have an IP address handed out by a DHCP server but not want
a default route to be installed. This can be done using the CLI command:
"set interfaces ethernet eth2 dhcp-options no-default-route"
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When rapid-commit is specified, dhcp6c will include a rapid-commit option in
solicit messages and wait for an immediate reply instead of advertisements.
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Currently DHCPv6-PD requires an interface address configured to dhcpv6 on the
CLI. This is not required also sometimes there is either no dhcpv6 interface
addressing available (PPPoE) or wanted. This limitation was artificial due to
the old interface code.
Change the implementation to spawn the DHCPv6 client and request a prefix even
when there is no address request configured.
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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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Pass the interface dictionary transparently to the DHCP module and render the
DHCP client config template directly from the same source instead of transcoding
it once more.
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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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The intermedite class only held the path to the configuration files - thus
its existence was doubtworthy. For better readability and a clean
inheritance graph that class has been dropped.
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