networking.service无法启动eth0：2和eth0：3，但是我的配置似乎正确。
我尝试了几件事，也将NIC从ens3重命名为eth0
/ etc / network / interfaces
auto lo
iface lo inet loopback
allow-hotplug eth0
auto eth0
iface eth0 inet static
address xx.xxx.xxx.xxx/22
gateway xx.xxx.xxx.x
allow-hotplug eth0:1
auto eth0:1
iface eth0:1 inet6 static
address 2a03:xxxx:x:xxxx::1000/64
gateway fe80::1
allow-hotplug eth0:2
iface eth0:2 inet6 static
address 2a03:xxxx:x:xxxx::2000/64
gateway fe80::1
allow-hotplug eth0:3
iface eth0:3 inet6 static
address 2a03:xxxx:x:xxxx::3000/64
gateway fe80::1
预期：
启动时，eth0和eth0：1会自动启动。
ifup eth0：2和ifup eth0：3调出其他网卡
实际：
ifup eth0:2
RTNETLINK answers: File exists
ifup: failed to bring up eth0:2
ifup eth0:3
RTNETLINK answers: File exists
ifup: failed to bring up eth0:3
它给出一个错误，但是尽管有错误，适配器仍已加载并且IPv6正在工作。
此外，如果我添加
自动eth0：2
自动eth0：3
networking.service在启动时失败：
● networking.service - Raise network interfaces
Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2019-07-19 20:29:26 CEST; 1min 21s ago
Docs: man:interfaces(5)
Process: 409 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
Main PID: 409 (code=exited, status=1/FAILURE)
Jul 19 20:29:24 root systemd[1]: Starting Raise network interfaces...
Jul 19 20:29:24 root ifup[409]: ifup: waiting for lock on /run/network/ifstate.eth0
Jul 19 20:29:26 root ifup[409]: Waiting for DAD... Done
Jul 19 20:29:26 root ifup[409]: RTNETLINK answers: File exists
Jul 19 20:29:26 root ifup[409]: ifup: failed to bring up eth0:2
Jul 19 20:29:26 root ifup[409]: RTNETLINK answers: File exists
Jul 19 20:29:26 root ifup[409]: ifup: failed to bring up eth0:3
Jul 19 20:29:26 root systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Jul 19 20:29:26 root systemd[1]: networking.service: Failed with result 'exit-code'.
Jul 19 20:29:26 root systemd[1]: Failed to start Raise network interfaces.
尽管联网服务失败，但所有IPv6均正常工作。
我不知道是什么问题。