[systemd-devel] systemd-networkd: IPv6 prefix delegation disabled by ipv6forwarding=true

[Barry Scott]

> On 14 Jan 2025, at 09:04, Max Gautier <mg at max.gautier.name> wrote:
> 
> I have similar setup (PPPoE, /48 delegation) here are my network files:
> (It's been a while, I don't remember the reason for everything)
> 

Thanks to all of you that responded. I now have every working with the information you provided.

This is what I ended up with

File: /etc/systemd/networkd.conf.d/10-forwarding.conf

[Network]
IPv4Forwarding=true
IPv6Forwarding=true

Two .link files to rename the interfaces to "internal" and "external" based on MAC Address of NIC.

File: /etc/systemd/network/internal-if.network

[Match]
Name=internal

[Network]
Description=internal network
Address=172.17.1.1/24
IPForward=ipv6
DNS=127.0.0.1

IPv6SendRA=true
DHCPPrefixDelegation=true

The IPv6SendRA=true and DHCPPrefixDelegation=true settings make the clients on the internal network get sent what they need to come up correctly.

File: /etc/systemd/network/ppp0-if.network

[Match]
Name=ppp0

[Network]
Description=external network
Address=2001:xxx:xxx:1
IPv6AcceptRA=true
UseDelegatedPrefix=true

I set explicit IPv6AcceptRA=true and UseDelegatedPrefix=true here at the external side.

I have a pppoe.service that brings up the ppp0 interface

Barry

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