使用 systemd 在启动时在 VLAN 上启动 ppp

Question

我正在用 Linux 盒子替换我的消费者路由器/AP。我的消费者路由器通过标记 VLAN 上的 PPPoE 链路拨入我的 ISP。我配置了一个工作设置，其中ppp使用标记的设备enp7s0.201，并且它运行良好，直到我重新启动。重新启动时，ppp在创建 VLAN 设备之前出现，并立即终止。

[me@router ~]$ sudo journalctl -b | egrep 'ppp|enp7s0'
Feb 11 03:01:22 router kernel: r8169 0000:07:00.0 enp7s0: renamed from eth0
Feb 11 03:01:23 router systemd[1]: ppp@centurylink.service: Unit is bound to inactive unit sys-subsystem-net-devices-enp7s0.201.device. Stopping, too.
Feb 11 03:01:23 router systemd-networkd[444]: /etc/systemd/network/enp7s0.201.netdev:5: Unknown section 'VLAN'. Ignoring.
Feb 11 03:01:25 router systemd-networkd[444]: enp7s0.201: netdev ready
Feb 11 03:01:25 router systemd-networkd[444]: enp7s0: IPv6 successfully enabled
Feb 11 03:01:25 router kernel: r8169 0000:07:00.0 enp7s0: link down
Feb 11 03:01:25 router kernel: r8169 0000:07:00.0 enp7s0: link down
Feb 11 03:01:25 router kernel: IPv6: ADDRCONF(NETDEV_UP): enp7s0: link is not ready
Feb 11 03:01:25 router systemd-networkd[444]: enp7s0.201: IPv6 successfully enabled
Feb 11 03:01:25 router systemd-networkd[444]: enp7s0: Gained carrier
Feb 11 03:01:25 router systemd-networkd[444]: enp7s0.201: Gained carrier
Feb 11 03:01:25 router systemd-networkd[444]: enp7s0.201: Lost carrier
Feb 11 03:01:26 router systemd-networkd[444]: enp7s0: Lost carrier
Feb 11 03:01:27 router systemd-networkd[444]: enp7s0.201: Gained IPv6LL
Feb 11 03:01:27 router systemd-networkd[444]: enp7s0: Gained carrier
Feb 11 03:01:27 router kernel: r8169 0000:07:00.0 enp7s0: link up
Feb 11 03:01:27 router kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp7s0: link becomes ready
Feb 11 03:01:27 router systemd-networkd[444]: enp7s0.201: Gained carrier
Feb 11 03:01:29 router systemd-networkd[444]: enp7s0: Gained IPv6LL
Feb 11 03:01:32 router systemd-networkd[444]: enp7s0: Lost carrier
Feb 11 03:01:32 router kernel: r8169 0000:07:00.0 enp7s0: link down
Feb 11 03:01:32 router systemd-networkd[444]: enp7s0.201: Lost carrier
Feb 11 03:01:35 router systemd-networkd[444]: enp7s0: Gained carrier
Feb 11 03:01:35 router kernel: r8169 0000:07:00.0 enp7s0: link up
Feb 11 03:01:35 router systemd-networkd[444]: enp7s0.201: Gained carrier

我已从文件Before=network.target中删除了 a ppp@.service，而是添加了一个 drop-in BindsTo=sys-subsystem-net-devices-enp7s0.201.device。

[me@router ~]$ sudo systemctl cat ppp@centurylink
[sudo] password for me: 
# /usr/lib/systemd/system/ppp@.service
[Unit]
Description=PPP link to %I
#Before=network.target

[Service]
ExecStart=/usr/sbin/pppd call %I nodetach nolog

[Install]
WantedBy=multi-user.target

# /etc/systemd/system/ppp@centurylink.service.d/port-bind.conf
[Unit]
BindsTo=sys-subsystem-net-devices-enp7s0.201.device

然而，看看pppd启动过程中运行的位置，它仍然早于enp7s0.201可用时间。

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编辑：我是个白痴。我忘记了我还需要一个After=sys-subsystem-net-devices-enp7s0.201.device临时服务。