Permanent network settings

Question

In my (virtual) Ubuntu server I'm using two network interfaces, cmd ls /sys/class/net/ returns

eth0  eth1  lo

but eth1 isn't enabled at startup and I have to manually setup, usually I'm using commands

sudo ifconfig eth1 10.10.0.2 netmask 255.255.255.0
sudo route add default gw 10.10.0.100 eth1
sudo ifconfig eth1 up

My question is: how can I save configuration for eth1?

cat /etc/network/interfaces:

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
iface eth0 inet6 auto

Solution

Add the following to the configuration file at /etc/network/interfaces or create a new file in /etc/network/interfaces.d/ called eth1

auto eth1
    iface eth1 inet static
        address 10.10.0.2
        netmask 255.255.255.0
        gateway 10.10.0.100

Debian Wiki - Network configuration is a great place to read and understand how to write network configurations

Comments

[TheOdd]

If all else fails, you could add a startup script that runs those commands.

[steeldriver]

Please edit your question to include the contents of the /etc/network/interfaces file