[systemd-devel] systemd-networkd not sending periodic router advertisements

[Marcel Menzel]

Hello List,

after switching from radvd to systemd-networkd for router 
advertisements, I noticed my Android device losing IPv6 connection after 
a while and not displaying any IPv6 Addresses anymore in the network 
overview.

I am aware with IPv6 issues on Android on certain vendors / ROMs, but 
after trying to troubleshoot it, I noticed systemd-networkd not sending 
periodic router advertisements into my network compared to radvd.

In radvd, there's the MinRtrAdvInterval and MaxRtrAdvInterval config 
option, whileas for systemd-networkd I wasn't able to find any of these 
options. Trying to adjust timers for PreferredLifetimeSec, 
ValidLifetimeSec or RouterLifetimeSec I still wasn't able to get 
networkd to send out periodic RAs (either with the defaults or my own 
values).

There will only be sent a router advertisement for client initiated 
router solicitations, like with the rdisc6 tool. I confirmed this with 
radvdump and tcpdump. As soon as I re-start radvd, IPv6 Adresses 
re-appear on my Android device. Multicast snooping has been disabled on 
all of my bridges. My sd-networkd .network config file for one bridge 
looks like this:

     [Match]
     Name=br0

[Network]
Address=fe80::1/64
Address=2a0f:85c1:beef:2031::/64
IPv6AcceptRA=false
IPv6SendRA=yes
IPv6PrivacyExtensions=no

[IPv6SendRA]
RouterLifetimeSec = 60
EmitDNS = yes
DNS = fd00:0:0:10::4
EmitDomains = no

[IPv6Prefix]
Prefix=2a0f:85c1:beef:2031::/64
PreferredLifetimeSec=60
ValidLifetimeSec=300

Did I miss an option for enabling periodic RAs or isn't there simply a 
way to achieve this?`

Kind regards,

Marcel MEnzel
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