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rated 0 times [  1] [ 0]  / answers: 1 / hits: 1825  / 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?


More From » networking

 Answers
4

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.


[#695] Saturday, July 17, 2021, 3 Years  [reply] [flag answer]
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