[systemd-devel] [systemd-networkd] Can use IPv6SendRA and IPv6AcceptRA in a same .network file

[Mantas Mikulėnas]

Hmm, I don't understand why you need to send RAs on eth0, if that's the
connection to your VPS provider?

On Sun, Dec 12, 2021 at 5:17 AM jackyzy823 <jackyzy823 at gmail.com> wrote:

> Dear developers.
>
> I have a question about if i can use IPv6SendRA and IPv6AcceptRA in a same
> .network file.
>
> Here's the situation. My VPS provider offers an IPv6 /64 prefix for my
> machine.
>
> I can achieve SLAAC via radvd + systemd-networkd using following config.
>
>
> /etc/radvd.conf
> ```
> interface eth0
> {
>         AdvSendAdvert on;
>         MinRtrAdvInterval 30;
>         MaxRtrAdvInterval 100;
>         prefix <prefix>::/64
>         {
>                 AdvOnLink on;
>                 AdvAutonomous on;
>                 AdvRouterAddr off;
>         };
>         RDNSS <DNS1> <DNS2>
>         {
>         };
> };
>
> ```
>
> /etc/systemd/network/eth0.network
> ```
> [Match]
> Name=eth0
>
> [Network]
> IPv6AcceptRA=yes
> Gateway=fe80::1
>
> ...other ipv4 config
>
> ```
>
>
> However, i found that systemd-networkd have IPv6SendRA options, so i tried
> to do all things in systemd-networkd , but it failed to get an IPv6 address.
>
> here's my config
> /etc/systemd/network/eth0.network
> ```
> [Match]
> Name=eth0
>
> [Network]
> IPv6AcceptRA=yes
> IPv6SendRA=yes
> Gateway=fe80::1
>
>
> [IPv6SendRA]
> DNS=<DNS1>
> DNSLifetimeSec=100
>
> [IPv6PRefix]
> Prefix=<prefix>
>
> ```
>
> I also tried adding RouterLifetimeSec=0 to [IPv6SendRA] section but it
> still failed to get an IPv6 address.
>
> I did a tcpdump : `tcpdump -vvvv -n -i any icmp6`. and i can see `router
> solicitation` and `router advertisement` messages.
>
> So is my configuration wrong ,or does systemd-networkd  support this kind
> of operation ?
>
> Systemd version
> `
> systemctl --version
> systemd 249 (249.7-2-arch)
> +PAM +AUDIT -SELINUX -APPARMOR -IMA +SMACK +SECCOMP +GCRYPT +GNUTLS
> +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD
> +LIBCRYPTSETUP +LIBFDISK +PCRE2 -PWQUALITY +P11KIT -QRENCODE +BZIP2 +LZ4
> +XZ +ZLIB +ZSTD +XKBCOMMON +UTMP -SYSVINIT default-hierarchy=unified
> `
>
> Thanks.
>
> Best regards,
> Jack
>
>

-- 
Mantas Mikulėnas
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