Ubuntu 21.10 static ip network configuration

Question

I have edited /etc/netplan/01-network-manager-all.yaml to get a static ip address:

network:
  version: 2
  renderer: networkd
  ethernets:
    wlp0s20f3:
      dhcp4: no
      addresses:
        - 10.1.10.23/24
      routes:
        - to: default
          via: 10.1.10.1
      nameservers:
          addresses: [10.1.1.10]

After netplan apply everything is fine, the interface is configured according to the config, but after reboot, the interface gets some additional automatic dhcp configuration:

2: wlp0s20f3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether cc:15:31:5e:bf:41 brd ff:ff:ff:ff:ff:ff
    inet 10.1.10.101/24 brd 10.1.10.255 scope global dynamic noprefixroute wlp0s20f3
       valid_lft 5652sec preferred_lft 5652sec
    inet 10.1.10.23/24 brd 10.1.10.255 scope global secondary noprefixroute wlp0s20f3
       valid_lft forever preferred_lft forever
    inet6 fe80::d6f7:2c10:8bf1:af66/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

It is even somehow assigned an ipv6 address despite

net.ipv6.conf.all.disable_ipv6=1

being set in /etc/sysctl.conf

It seems like some service is changing the configuration, it didn't happen on 20.04.

How to disable this automatic configuration?

score 1 · Accepted Answer · answered Apr 03 '22 at 16:31

The DHCP address is provided by Network Manager. In order to use a scipt and therefore netplan, disable NM like this: How do I disable network manager permanently?

Next, your netplan file fails to provide the SSID and WPA2 password. I suggest that you amend it:

network:
  version: 2
  renderer: networkd
  wifis:
    wlp0s20f3:
      dhcp4: no
      dhcp6: no
      addresses: [10.1.10.23/24]
      nameservers:
        addresses: [10.1.1.10]
      access-points:
        "network_ssid_name":
          password: "**********"
      routes:
        - to: default
          via: 10.1.10.1

Note that the SSID and password are enclosed in quotation marks ". Netplan is very specific about indentation, spacing, etc., so proofread carefully twice. Follow with:

sudo netplan generate
sudo netplan apply

Please note that in a deployment of several laptops in a network, wlp0s20f3 is very unlikely to be the same interface name for all. As @heynnema points out above, you will need to interrogate each laptop for its logical interface name.

score 0 · Answer 2 · edited Jan 04 '23 at 16:35

0

Try with renderer. NetworkManager works perfectly for me in Ubuntu 21.10.

network:
  version: 2
  renderer: NetworkManager
  ethernets:
    wlp0s20f3:
      addresses:
          - tu ip asignada/**
  nameservers:
    search: [tu dominio]
    addresses: [8.8.8.8, 8.8.4.4]
  routes:
      - to: default
        via: tu touter

edited Jan 04 '23 at 16:35

karel

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answered Jan 04 '23 at 13:19

RootDesktopUser

11

Ubuntu 21.10 static ip network configuration

2 Answers2