4 Key network commands in the shell

Ifconfig

This command is consistent with the "ipconfig" function of windows for displaying details such as network interfaces, subnet masks, and so on.

Ifconfig the left column is the network interface name, which occupies 10 bytes, and several columns on the right show the details of the corresponding network interface.

In each system, the default is a lo, called the loopback interface, which points to the current host itself.

The following is the message displayed after running this command on the blogger's computer:

650) this.width=650; "title=" Ifconfig "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiom1jtzilidxowaaf5wokecpa348.jpg the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

Related tips:

1. Print a list of network interfaces

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiol1jtzjssmsvraaafuf9i7qs044.png the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

Description: The first 10 bytes of the ifconfig output show the network interface name, so we use the Cut command to extract the first 10 characters of each line.

Run as follows:

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiol1jtzj7ym1liaabpmjl6seu051.png the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

2. Hardware address (MAC address) spoofing

In some cases, it is necessary to use hardware addresses to authenticate or filter computers on the network, and we can use hardware address spoofing

The command is as follows:

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiom1jtzlcj6phiaaaepqnrfhy091.png the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

Let's run a look at the results:

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiom1jtzluxx1gnaagkyglo5wc494.png the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

Note: This command requires root access

Host and Nslookup

These two commands are the DNS Lookup tool

When the host is executed, it lists all the IP addresses of a domain name; nslookup is a host-like command that is used to query DNS-related details and name resolution.

Here is the IP address of the www.baidu.com on the blogger's computer:

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiom1jtzm6bvc7baaekwwpkfoy612.jpg the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

Route

The operating system maintains a table called the routing table, which contains information about how the packet is forwarded and which nodes are forwarded through the network, and the following methods can be used to display the routing table

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiol1jtznui5e5laaakfnchy7i787.png the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

-n Specifies that the address is displayed numerically.

As shown below:

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiom1jtzoatybpdaacs7mgaz10425.jpg the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

Traceroute

This command displays all gateway addresses for the packet path. Traceroute information can help us figure out how many hops a packet will take to reach its destination. The number of Midway gateways or routers gives a measure of the direct distance of two nodes on the network.

Again, let's look at the following:

Here, Bo Master Query www.baidu.com packet forwarding information:

650) this.width=650; "title=" "src=" http://www.linuxprobe.com/wp-content/uploads/2017/03/ Wkiol1jtzpkxpv-uaaeqvpmvgqk646.jpg the use of 4 network-related commands in the "alt=" Shell "border=" 0 "style=" height:auto; "/>

This shows that the arrival of Baidu needs to pass 12 jump.

Original address:http://www.linuxprobe.com/shell-command.html

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4 Key network commands in the shell