Network IP configuration

Ubuntu System Configuration

In Ubuntu 20.04, the "eth0" interface is set to obtain an IP address
dynamically (DHCP), while "eth1" is configured with a fixed IP address
of "192.168.150.1".

The configuration for "eth1" can be found in the
"/etc/netplan/01-netcfg.yaml" file. You can modify this file to adjust
the network settings for your Ubuntu system.

   linaro@bm1684:~$ cat /etc/netplan/01-netcfg.yaml  | more
   network:
           version: 2
           renderer: networkd
           ethernets:
                   eth1:
                           dhcp4: no
                           addresses: [192.168.150.1/24]
                           optional: yes

If the user deletes this file, then eth1 will revert to acquiring an
IP address through DHCP, similar to eth0. If the user wants to assign
a fixed IP address to eth0 as well, they only need to add an eth0 node
(similar to eth1) in the /etc/netplan/01-netcfg.yaml file and then
restart for the changes to take effect.