ip -6 route命令可以显示出离ipv6断网还有多久:
root@ol04:/home/seedbox/ipv6-dhclient-script# ip -6 route
2001:bc8:3b34::/48 dev eno1 proto kernel metric 256 pref medium
fe80::/64 dev eno1 proto kernel metric 256 pref medium
default via fe80::7626:acff:fe76:38a3 dev eno1 proto ra metric 1024 expires 1762sec hoplimit 64 pref medium
root@ol04:/home/seedbox/ipv6-dhclient-script# ip -6 route
2001:bc8:3b34::/48 dev eno1 proto kernel metric 256 pref medium
fe80::/64 dev eno1 proto kernel metric 256 pref medium
default via fe80::7626:acff:fe76:38a3 dev eno1 proto ra metric 1024 expires 1409sec hoplimit 64 pref medium
root@ol04:/home/seedbox/ipv6-dhclient-script#