Работает, теперь в логе при недоступности интерфейса
ndm: Network::Interface::Tunnel: "IPIP6": source interface CdcEthernet0 is down, standby.
Но в процессе включений отключений интерфейсов в логе вылезла кучка красноты system failed
Mar 27 22:26:43ndm
Io::Netlink: unable to bind: address already in use.
Mar 27 22:26:43ndm
Ip6::Util::NetlinkTools: system failed [0xcffd003c].
Mar 27 22:26:43ndm
Ip6::Addressing: system failed [0xcffd0055], unable to set 2a02:2168:18db:8800:ee43:f6ff:fe04:9b24 to br0: no error.
Mar 27 22:26:43root
Modem NAT rule applied
Mar 27 22:26:43root
Core::Syslog: last message repeated 3 times.
Mar 27 22:26:44ipsec
10[KNL] fe80::ee43:f6ff:fe04:9b25 appeared on eth2.2
Mar 27 22:26:45ipsec
13[KNL] interface ipip2 deactivated
Mar 27 22:26:45ndm
Network::Interface::Base: "IPIP2": interface is down.
Mar 27 22:26:45ipsec
08[KNL] interface ipip2 activated
Mar 27 22:26:45ndm
Network::Interface::Base: "IPIP2": interface is up.
Mar 27 22:26:45ndhcpc
GigabitEthernet0/Vlan2: NDM DHCP client (version 3.2.11) started.
Mar 27 22:26:45ndhcpc
GigabitEthernet0/Vlan2: created PID file "/var/run/ndhcpc-eth2.2.pid".
Mar 27 22:26:45root
Modem NAT rule applied
Mar 27 22:26:46root
Core::Syslog: last message repeated 2 times.
Mar 27 22:26:46ndm
Ip6::Addressing: system failed [0xcffd0055], unable to remove 2a02:2168:18db:8800:ee43:f6ff:fe04:9b24 from br0: address not available.
С доработкой не связано, но кину пока селф сюда.
Порезвлюсь если будет воспроизводимо, создам новую тему.