[systemd-devel] networkd : ipv6 prefix delegation

[Ede Wolf]

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