Configuring the network
Next, let’s look at some basic network configurations so that we can communicate with the outside world. I assume that there is an Ethernet interface (eth0) and that we only need a simple IPv4 configuration.
These examples use the network utilities that are part of BusyBox, which are sufficient for our simple use case. All we need are the old-but-reliable ifup and ifdown programs. You can read the manual pages for both to get the details. The main network configuration is stored in /etc/network/interfaces. You will need to create these directories in the staging directory:
etc/network
etc/network/if-pre-up.d
etc/network/if-up.d
var/run
Here is /etc/network/interfaces for a static IP address:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.1.101
netmask 255.255.255.0
network 192.168.1.0
Here is /etc/network/interfaces for a dynamic IP address, allocated using DHCP:
auto lo
iface lo...
