Ubuntu：netplan 禁用 dhcp

Question 1

在花了 X 个小时尝试找到修复方法后，我决定禁用DHCP服务器服务：

root@pro-rpi-02:~# systemctl status dhcpcd.service
● dhcpcd.service - DHCP Client Daemon
     Loaded: loaded (/lib/systemd/system/dhcpcd.service; disabled; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:dhcpcd(8)

现在一切都按照我希望的方式运行：

root@pro-rpi-02:~# more /etc/netplan/01-netcfg.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: no
      dhcp6: no
      addresses:
        - 192.168.1.2/26
      gateway4: 192.168.1.10
      nameservers:
          addresses: [192.168.1.24]
          search: [hello.home]
  vlans:
    vlan8:
      id: 8
      link: eth0
      dhcp4: no
      dhcp6: no
      addresses:
        - 192.168.8.2/24
root@pro-rpi-02:~# ip a sh vlan8
4: vlan8@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether dc:a6:32:b3:45:e0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.8.2/24 brd 192.168.8.255 scope global vlan8
       valid_lft forever preferred_lft forever
    inet6 fe80::dea6:32ff:feb3:45e0/64 scope link
       valid_lft forever preferred_lft forever

Answer

在花了 X 个小时尝试找到修复方法后，我决定禁用DHCP服务器服务：

root@pro-rpi-02:~# systemctl status dhcpcd.service
● dhcpcd.service - DHCP Client Daemon
     Loaded: loaded (/lib/systemd/system/dhcpcd.service; disabled; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:dhcpcd(8)

现在一切都按照我希望的方式运行：

root@pro-rpi-02:~# more /etc/netplan/01-netcfg.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: no
      dhcp6: no
      addresses:
        - 192.168.1.2/26
      gateway4: 192.168.1.10
      nameservers:
          addresses: [192.168.1.24]
          search: [hello.home]
  vlans:
    vlan8:
      id: 8
      link: eth0
      dhcp4: no
      dhcp6: no
      addresses:
        - 192.168.8.2/24
root@pro-rpi-02:~# ip a sh vlan8
4: vlan8@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether dc:a6:32:b3:45:e0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.8.2/24 brd 192.168.8.255 scope global vlan8
       valid_lft forever preferred_lft forever
    inet6 fe80::dea6:32ff:feb3:45e0/64 scope link
       valid_lft forever preferred_lft forever

Question 2

顺便说一下，我在 IPv6 方面遇到了类似的问题，当我从 Ubuntu 18.04 升级到 20.04 并且 netplan 时，我注意到我现在有两个 IPv6 地址：

自动 DHCP？2001:19f0:6801:1dc3:5400:3ff:feeb:abea
我静态选择的自定义一个2001:19f0:6801:1dc3::1

> ip addr
[...]
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 56:00:03:eb:ab:ea brd ff:ff:ff:ff:ff:ff
    inet 217.69.14.107/23 brd 217.69.15.255 scope global enp1s0
       valid_lft forever preferred_lft forever
    inet6 2001:19f0:6801:1dc3:5400:3ff:feeb:abea/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 2591957sec preferred_lft 604757sec
    inet6 2001:19f0:6801:1dc3::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::5400:3ff:feeb:abea/64 scope link 
       valid_lft forever preferred_lft forever

> curl ifconfig.io
2001:19f0:6801:1dc3:5400:3ff:feeb:abea

DHCP 是第一个，因此默认使用它，这不是我想要的（我希望使用更短的自定义 IPv6）。

我尝试使用禁用 dhcp6，dhcp6: no但 DHCP 地址始终存在... 我也没有找到一种简单的方法来更改顺序以首先使用自定义地址。经过多次尝试和错误，我发现这是由“路由器通告”引起的，而不是由 DHCP 引起的，所以我不得不使用禁用它accept-ra: no，并手动设置默认路由，因为这也是由路由器通告配置的。

我的最终配置文件如下：

network:
  version: 2
  renderer: networkd
  ethernets:
    enp1s0:
      dhcp4: yes
      accept-ra: no # otherwise we get auto IPv6 too
      addresses: ['2001:19f0:6801:1dc3::1/64']
      gateway6: fe80::fc00:3ff:feeb:abea

（请注意，我在这里没有指定任何名称服务器，因为我正在运行本地解析器，但您可能必须这样做）

现在我终于只剩下自定义的 IPv6 了，而且它运行良好：

> ip addr
[...]
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 56:00:03:eb:ab:ea brd ff:ff:ff:ff:ff:ff
    inet 217.69.14.107/23 brd 217.69.15.255 scope global dynamic enp1s0
       valid_lft 86397sec preferred_lft 86397sec
    inet6 2001:19f0:6801:1dc3::1/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::5400:3ff:feeb:abea/64 scope link 
       valid_lft forever preferred_lft forever

> curl ifconfig.io
2001:19f0:6801:1dc3::1

Answer