For example, say you want the RPi Ethernet port to use DHCP, but to also have a fixed IP address so you can connect to it using a direct cable connection from a laptop.
sudo nano /etc/network/interfaces
Use this for the eth0 adaptor:
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
auto eth0:1
iface eth0:1 inet static
address 192.168.1.123
netmask 255.255.255.0

4 years ago
Yes. it still works
6 years ago
not working on Stretch! is this still working for anyone?
6 years ago
Just missing the following:
/sbin/ifup eth0:1