Static IPv6 address removed when SLAAC used

[arno481]

Hi

when I create the following config, and enable radvd (IPv6 address auto configuration), router1 and router3 get a SLAAC address, but their static address is deleted.

---

#
#  router1 -aa- router2 -bb- router3
#

switches: 2

machines:
  router1:
    type: router
    interfaces:
      eth12:
        ipv4: 192.168.0.1/24   # Artefact
        ipv6: 2001:0db8:ffff:00aa::1/64
        mac: 00:00:00:00:01:11
        bridge: 0
  router2:
    type: router
    interfaces:
      eth12:
        ipv4: 192.168.0.2/24   # Artefact
        ipv6: 2001:0db8:ffff:00aa::2/64
        mac: 00:00:00:00:02:12
        bridge: 0
      eth23:
        ipv4: 10.0.0.2/24       # Artefact
        ipv6: 2001:0db8:ffff:00bb::2/64
        mac: 00:00:00:00:02:23
        bridge: 1
  router3:
    type: router
    interfaces:
      eth23:
        ipv4: 10.0.0.3/24      # Artefact
        ipv6: 2001:0db8:ffff:00bb::3/64
        mac: 00:00:00:00:03:23
        bridge: 1

Then enable RADVD config on router2:

1. Create /etc/radvd.conf

interface eth12
{
        AdvSendAdvert on;
        prefix 2001:db8:400:600::/64
        {
        };
};

interface eth23
{
        AdvSendAdvert on;
        prefix 2001:db8:400:629::/64
        {
        };
};

2. systemctl enable radvd
3. systemctl start radvd

[Erik-Lamers1]

I'm not able to reproduce your problem. If I spin up an environment with the config you pasted and I enable radvd with only the configuration from above it works fine for me, even after a restart of the environment.

root@router1:~# ping 2001:db8:400:600:200:ff:fe00:111
PING 2001:db8:400:600:200:ff:fe00:111(2001:db8:400:600:200:ff:fe00:111) 56 data bytes
64 bytes from 2001:db8:400:600:200:ff:fe00:111: icmp_seq=1 ttl=64 time=0.057 ms
64 bytes from 2001:db8:400:600:200:ff:fe00:111: icmp_seq=2 ttl=64 time=0.045 ms
^C
--- 2001:db8:400:600:200:ff:fe00:111 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1031ms
rtt min/avg/max/mdev = 0.045/0.051/0.057/0.006 ms
root@router1:~# ping 2001:db8:400:629:200:ff:fe00:223
PING 2001:db8:400:629:200:ff:fe00:223(2001:db8:400:629:200:ff:fe00:223) 56 data bytes
64 bytes from 2001:db8:400:629:200:ff:fe00:223: icmp_seq=1 ttl=64 time=0.244 ms
64 bytes from 2001:db8:400:629:200:ff:fe00:223: icmp_seq=2 ttl=64 time=0.066 ms
^C
--- 2001:db8:400:629:200:ff:fe00:223 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1010ms
rtt min/avg/max/mdev = 0.066/0.155/0.244/0.089 ms
root@router1:~# ping  2001:db8:400:629:200:ff:fe00:323
PING 2001:db8:400:629:200:ff:fe00:323(2001:db8:400:629:200:ff:fe00:323) 56 data bytes
64 bytes from 2001:db8:400:629:200:ff:fe00:323: icmp_seq=1 ttl=63 time=0.135 ms
64 bytes from 2001:db8:400:629:200:ff:fe00:323: icmp_seq=2 ttl=63 time=0.080 ms
^C
--- 2001:db8:400:629:200:ff:fe00:323 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1015ms
rtt min/avg/max/mdev = 0.080/0.107/0.135/0.029 ms
root@router1:~# ping 2001:db8:ffff:aa::2
PING 2001:db8:ffff:aa::2(2001:db8:ffff:aa::2) 56 data bytes
64 bytes from 2001:db8:ffff:aa::2: icmp_seq=1 ttl=64 time=0.104 ms
64 bytes from 2001:db8:ffff:aa::2: icmp_seq=2 ttl=64 time=0.066 ms
^C
--- 2001:db8:ffff:aa::2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1022ms
rtt min/avg/max/mdev = 0.066/0.085/0.104/0.019 ms

Maybe your setup is different? I'm running on a freshly installed 20.04 machine.

[arno481]

I cannot reproduce it either now. VM 20.04, git commit 061f0cd

Saw it twice with different radvd.conf. I swear ;o)