Network IP Configuration

Ubuntu System

In the Ubuntu 20.04 system, the "eth0" interface in the dual network
ports is configured to obtain an IP dynamically (i.e., via DHCP),
while "eth1" is fixed to "192.168.150.1".

Network configuration is done through the
"/etc/netplan/01-netcfg.yaml" file, which allows modifications to the
original network configuration of the Ubuntu system.

   linaro@sophon:~$ cat /etc/netplan/01-netcfg.yaml
   network:
           version: 2
           renderer: networkd
           ethernets:
                   eth0:
                           dhcp4: yes
                           addresses: []
                           optional: yes
                           dhcp-identifier: mac
                   eth1:
                           dhcp4: no
                           addresses: [192.168.150.1/24]
                           optional: yes

If the user deletes this file, then "eth1" will change to obtain an IP
using the same DHCP method as "eth0"; if the user wants to set a fixed
IP for "eth0" as well, they only need to modify the "eth0" node in the
"/etc/netplan/01-netcfg.yaml" file (referencing "eth1"), and restart
for the changes to take effect.