Technical Tip: PPPoE-interface configuration for IPv4 and IPv6

Kraven2323 · ‎04-11-2022

Description

This article describes how to use config pppoe-interface to set up a pppoe connection for both IPv4 and IPv6.

Scope

Firmware 6.2 and above. Currently only available via the CLI.

Results

Port3 will be used in this example as the one connected to the ISP.

Scenario: Both IPv4 and IPv6 should have a connection via PPPoE.

The IPv6 address is received via DHCP over a PPPoE connection.

Start by configuring pppoe-interface for the port 3 connected with the PPPoE:

config system pppoe-interface

edit "PPPOE"

set ipv6 enable --> Enabling IPv6 option under the PPPoE interface.

set device "port3"

set username <username>

set password <password>

Enable DHCPv6 under the PPPoE interface:

config system interface

edit "PPPOE"

set mode pppoe

set type tunnel

config ipv6
set ip6-mode dhcp --> Enabling IPv6 DHCP client option under the PPPoE interface.
set interface "port3"

next

end
A physical interface only has an IPv6 option enabled:

config system interface
edit "port3"
set type physical
config ipv6
next

end

When configuring pppoe-interface, one can select the port using the command 'set device <port>'. After that, a sub-interface will appear.

Check under the 'diagnose netlink interface list <pppoe>' for the newly created interface:

diag netlink interface list PPPOE

if=PPPOE family=00 type=512 index=23 mtu=1492 link=0 master=0
ref=30 state=start present fw_flags=0 flags=up p2p run noarp multicast
Qdisc=pfifo_fast
stat: rxp=527 txp=1219 rxb=727091 txb=250660 rxe=0 txe=0 rxd=0 txd=0 mc=0 collision=0 @ time=1649641676
re: rxl=0 rxo=0 rxc=0 rxf=0 rxfi=0 rxm=0
te: txa=0 txc=0 txfi=0 txh=0 txw=0
misc rxc=0 txc=0
input_type=0 state=3 arp_entry=0 refcnt=30

Note:

PPPoE Interfaces do not support NPU Offload.

Certain ISPs require the configuration of a VLAN ID on PPPoE connections.

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