Linux /etc/network/interfaces configuration interface method

The /etc/network/interfaces file in Linux is used to configure network interfaces.

Initialize Ethernet Interface

Most network interface configurations can be done in /etc/network/interfaces. For example, configure a static IP (DHCP) for the network card, set routing information, configure the IP mask, set the default route, etc.

PS: If you want to automatically start the network port when the system starts, you need to add a line of auto, as shown in the example below.

1. Use a dynamic IP address

auto eth0
iface eth0 inet dhcp

2. Use a static IP address

auto eth0
iface eth0 inet static
  address 192.168.1.100
  netmask 255.255.255.0
  gateway 192.168.1.1
# network 192.168.1.0
# broadcast 192.168.1.255

The default values ​​for network and broadcast are usually sufficient.

3. Check the routing table

# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

route -n does not resolve names.

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