Question

1

Ubuntu 21.10 static ip network configuration

rated 0 times [ 1] [ 0] / answers: 1 / hits: 1828 / 3 Years ago, sat, july 17, 2021, 1:40:28

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?

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sweetrifiabl

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answered 3 Years ago eeperant · Accepted Answer

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.