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/etc/network/interfacesThis article will look at the complete syntax explanation in Debian and its derivatives .

The file /etc/network/interfacesallows you to assign static and dynamic IP addresses to interfaces, configure routing information, default gateway, masquerade network bindings, etc.

Physical and virtual network interfaces in Linux

TCP/IPThe implementation defines an interface that masks variations in network provisioning and reduces network communication to the exchange of data with an abstract entity.

The Linux kernel distinguishes between physical and virtual network interfaces.

ifconfigUse commands to diagnose and configure network interfaces in Linux

ifconfigIs a UNIX-like system command line program used to diagnose and configure network interfaces.

$ ifconfig

Output:

docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:72:4e:1a:db  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp3s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether d4:81:d7:bd:c6:ef  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 11182  bytes 1139133 (1.1 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11182  bytes 1139133 (1.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.69  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 2403:3800:3217:204b:3be8:d506:7950:933c  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::4cd5:8a62:8187:55fc  prefixlen 64  scopeid 0x20<link>
        inet6 2403:3800:3217:204b:9902:5eba:d521:1d6b  prefixlen 64  scopeid 0x0<global>
        ether 3c:f8:62:e5:d7:e2  txqueuelen 1000  (Ethernet)
        RX packets 521763  bytes 557860095 (557.8 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 288568  bytes 61590689 (61.5 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

We can see that there are four network interfaces.

• docker0It is a docker virtual bridge interface that establishes a unique network for Docker containers, allowing them to connect.
• enp3s0Formerly known as eth0. This physical interface represents Ethernet.
• loIs a virtual network interface used primarily for diagnostics and troubleshooting, and connects to services running on localhost.
• wlp2soIt is your wifi interface.

Setting up in Linuxeth0

In the following example, 192.168.1.5the IP address and 192.168.1.254gateway (route) settings to eth0(initial network interface card) are used:

iface eth0 inet static
address 192.168.1.5
netmask 255.255.255.0
gateway 192.168.1.254

dhcpInterface settings in Linux

Use the following command to eth0convert to dhcp.

auto eth0
iface eth0 inet dhcp

Edit /etc/network/interfacesthe file to create 静态the address interface

If you would like to configure 静态an IP address and gateway instead of using DHCP, replace the previous instructions with the following ( change 192.168.0.8/24and 192.168.0.1to your actual IP address):

auto <Interface>
iface <Interface> inet static
address 192.168.0.1
netmask 255.255.255.0

gateway 192.168.0.1
dns-nameservers 8.8.8.8