Ttyjfyk

I changed my network device names, but it doesn't kept saved after rebooting. I also deactivated interface wlan0, but it is still on again after rebooting.
Using UBUNTU.

Here /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

# The loopback network interface
auto lo
iface lo inet loopback


# The wan0 network interface
auto wan0
iface wan0 inet dhcp

# The eth0 network interface
auto eth0
iface eth0 inet dhcp

If you use ifconfig to configure your network interfaces, the changes will be lost after reboot.

To make your changes persistent, you need to modify configuration files like /etc/network/interfaces. For example, to disable an interface you can simply remove its config part from the file.

You can check man interfaces for available options and format of network config file for Ubuntu.

For the interface name part, you should check this file (if it's there on Ubuntu, I have it on Debian):

/etc/udev/rules.d/70-persistent-net.rules

Edit it if needed as per the comment inside

If there's no such file (in recent udev), there's still a specific package you can use to have the renaming done at boot: ifrename, or you can add some boot script yourself.

for deactivating wlan0, there are different things beside the /etc/network/interfaces. There's always NetworkManager lurking around. It's handy but it often interferes with the settings. See if you can do something with NetworkManager graphically or using nmcli , like:

nmcli radio wifi off

There's also the rfkill command (rfkill package). It uses the same backend as nmcli radio. For example you can prevent all wireless related activity with rfkill block all

In case anyone else is here looking for help in later versions of ubuntu server (17.x). They have switched from network (/etc/network/interfaces) to netplan (/etc/netplan/*.yml).

Hopefully this helps someone else/saves them some time.

Simple sample for a static IP configuration.

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
 version: 2
 renderer: networkd
 ethernets:
 eth0:
 dhcp4: no
 dhcp6: no
 addresses: [192.168.1.100/24]
 gateway4: 192.168.1.1
 nameservers:
 addresses: [192.168.1.1,8.8.8.8]

On ubuntu v17 when the static ip parameters in the file "interfaces" were set after rebooting the machine it gets the IP address from DHCP. (After this /etc/init.d/networking restart or ifdown/ifup work well but they are only temporary solutions). It is enough to replace the "dhcp4: yes" row to "dhcp4: no" in the /etc/netplan/*.yaml file and after reboot the settings in the file "interfaces" are asserted without giving any further settings in the netplan file. (A note: in man pages the syntax talks about only "dhcp4: true" with static IP settings(!))