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
