Ubuntu：netplan 禁用 dhcp

Question 1

在花了 X 個小時嘗試在這裡找到修復程序後，我決定停用DHCPCD服務：

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)

現在一切都像我希望的那樣運作：

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 個小時嘗試在這裡找到修復程序後，我決定停用DHCPCD服務：

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)

現在一切都像我希望的那樣運作：

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

根據記錄，我在 IPv6 上遇到了類似的問題，當我從 Ubuntu 18.04 升級到 20.04 和 netplan 時，我注意到我現在有兩個 IPv6 位址：

自動 DHCP？一2001:19f0:6801:1dc3:5400:3ff:feeb:abea
我靜態選擇的自訂一個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 是第一個，所以預設使用它，這不是我想要的（我想要使用更短的自訂 IPv6）。

我嘗試禁用 dhcp6，dhcp6: no但 DHCP 地址始終存在...我也沒有找到一種簡單的方法來更改順序以首先使用自訂地址。經過大量的試驗和錯誤，我發現這是由“路由器通告”引起的，而不是由 DHCP 引起的，所以我必須使用禁用它accept-ra: no，並手動設置默認路由，因為這也是由路由器通告配置的。

我的最終設定檔如下所示：

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

（請注意，我在這裡沒有指定任何名稱伺服器，因為我正在運行本機解析器，但您可能必須這樣做）

我終於只有我的自訂 IPv6 並且工作正常：

> 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