[systemd-devel] networkd : ipv6 prefix delegation

[Arian van Putten]

Just thinking out loud here but aren't RA messages are sent as link local
multicast messages? How can it send them if you disable link local
addressing?

On Mon, 5 Sept 2022, 19:14 Ede Wolf, <listac at nebelschwaden.de> wrote:

> Am 05.09.22 um 18:34 schrieb Ede Wolf:
> > Hello,
> >
> > For a simple setup, I've tried to replace radvd with systemds
> > IPv6SendRA=true.
> >
> > Now the link supposed to send the RA of course has both a fixed local as
> > well as fixed global (ULA) address. As it happens to be the default gw
> > as well.
> >
> > Since the local address is being configured manually,
> > LinkLocalAddressing is consequently set to no
> >
> >
> > Now networkd complains, from the journal:
> >
> > IPv6PrefixDelegation= is enabled but IPv6 link-local addressing is
> > disabled. Disabling IPv6PrefixDelegation=.
> >
> >
> > Not sure what I am overlooking, but the SendRA is meant for other
> > clients, not for this link. Otherwise I would have set IPv6AcceptRA to
> > true, not IPv6SendRA.
> >
> > What am I misinterpreting here?
> >
> > Thanks
> >
> > Ede
>
> I may have mixed up terms, something that, however, does not make things
> more comprehendable to me.
> I am not using DHCPv6, I would just like to announce the prefix via RA
> to other clients on that link. So prefix delegation is likely something
> else. I've just concluded that from the journal message.
>
> However, my .network file has no DHCPv6 related stanzas:
>
> [Match]
> Name=brlan
>
> [Link]
> MACAddress=02:...
> RequiredForOnline=yes
>
> [Network]
> Description=Bridge
> LinkLocalAddressing=no
> IPForward=ipv4
> IPForward=ipv6
> IPv6AcceptRA=no
> ConfigureWithoutCarrier=true
> IgnoreCarrierLoss=true
> DHCPServer=yes
> IPv6AcceptRA=false
> IPv6SendRA=true
>
> [Address]
> Address=192.168.38.1/24
>
> [Address]
> Address=fe80::38:1/64
> Scope=link
>
> [Address]
> Address=fde3:8b13:f1a5:38::1/64
> Scope=global
>
> [DHCPServer]
> PoolOffset=200
> PoolSize=32
> EmitNTP=yes
> NTP=192.168.38.101
>
> [IPv6SendRA]
> Managed=no
> OtherInformation=no
>
> [IPv6Prefix]
> AddressAutoconfiguration=true
> Prefix=fde3:8b13:f1a5:38::/64
>
>
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