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选题: 20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux
sources/tech/20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux.md
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux)
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[#]: via: (https://www.2daygeek.com/linux-unix-check-network-interfaces-names-nic-speed-ip-mac-address/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux
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======
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By default when you set up the server you will configure the primary network interface.
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This is part of the build work that everyone does.
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Sometimes you may need to configure an additional network interface for several reasons.
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This could be a network bonding/teaming or high availability or a separate interface for application requirements or backups.
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To do so, you need to know how many interfaces your computer has and their speed to configure it.
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There are many commands to check for available network interfaces, but we only use the IP command.
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Later we will write a separate article with all these tools.
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In this tutorial, we will show you the Available Network Interface Card (NIC) information, such as the interface name, associated IP address, MAC address, and interface speed.
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### What’s IP Command
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**[IP command][1]** is similar to ifconfig, which is used to for assigning Static IP Address, Route & Default Gateway, etc.,
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```
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# ip a
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1: lo: mtu 65536 qdisc noqueue state UNKNOWN
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link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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inet 127.0.0.1/8 scope host lo
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inet6 ::1/128 scope host
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valid_lft forever preferred_lft forever
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2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000
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link/ether fa:16:3e:a0:7d:5a brd ff:ff:ff:ff:ff:ff
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inet 192.168.1.101/24 brd 192.168.1.101 scope global eth0
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inet6 fe80::f816:3eff:fea0:7d5a/64 scope link
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valid_lft forever preferred_lft forever
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```
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### What’s ethtool Command
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The ethtool is used to query or control network driver and hardware settings.
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```
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# ethtool eth0
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```
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### 1) How to Check the Available Network Interfaces on Linux Using the IP Command
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When you run the IP command without any arguments, it gives you plenty of information, but if you only need the available network interfaces, use the following customized IP command.
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```
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# ip a |awk '/state UP/{print $2}'
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eth0:
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eth1:
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```
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### 2) How to Check the IP Address of a Network Interface on Linux Using the IP Command
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If you only want to see which IP address is assigned to which interface, use the following customized IP command.
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```
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# ip -o a show | cut -d ' ' -f 2,7
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or
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ip a |grep -i inet | awk '{print $7, $2}'
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lo 127.0.0.1/8
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192.168.1.101/24
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192.168.1.102/24
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```
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### 3) How to Check the Network Interface Card MAC Address on Linux Using the IP Command
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If you only want to see the network interface name and the corresponding MAC address, use the following format.
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To check a specific network interface MAC address.
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```
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# ip link show dev eth0 |awk '/link/{print $2}'
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00:00:00:55:43:5c
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```
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To check MAC address for all network interface.
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```
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# vi /opt/scripts/mac-addresses.sh
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#!/bin/sh
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ip a |awk '/state UP/{print $2}' | sed 's/://' | while read output;
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do
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echo $output:
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ethtool -P $output
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done
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```
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Run the below shell script to get the MAC address for multiple network interfaces.
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```
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# sh /opt/scripts/mac-addresses.sh
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eth0:
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Permanent address: 00:00:00:55:43:5c
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eth1:
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Permanent address: 00:00:00:55:43:5d
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```
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### 4) How to Check the Network Interface Port Speed on Linux Using the ethtool Command
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If you want to check the network interface port speed on Linux, use the ethtool command.
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To check the speed of a particular network interface port.
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```
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# ethtool eth0 |grep "Speed:"
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Speed: 10000Mb/s
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```
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To check the port speed for all network interfaces.
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```
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# vi /opt/scripts/port-speed.sh
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#!/bin/sh
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ip a |awk '/state UP/{print $2}' | sed 's/://' | while read output;
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do
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echo $output:
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ethtool $output |grep "Speed:"
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done
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```
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Run the below shell script to get the port speed for multiple network interfaces.
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```
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# sh /opt/scripts/port-speed.sh
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eth0:
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Speed: 10000Mb/s
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eth1:
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Speed: 10000Mb/s
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```
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### 5) Shell Script to Verify Network Interface Card Information
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This **[shell script][2]** allows you to gather all of the above information, such as network interface names, IP addresses of network interfaces, MAC addresses of network interfaces, and the speed of a network interface port.
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```
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# vi /opt/scripts/nic-info.sh
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#!/bin/sh
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hostname
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echo "-------------"
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for iname in $(ip a |awk '/state UP/{print $2}')
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do
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echo "$iname"
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ip a | grep -A2 $iname | awk '/inet/{print $2}'
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ip a | grep -A2 $iname | awk '/link/{print $2}'
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ethtool $iname |grep "Speed:"
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done
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```
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Run the below shell script to check network card information.
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```
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# sh /opt/scripts/nic-info.sh
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vps.2daygeek.com
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----------------
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eth0:
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192.168.1.101/24
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00:00:00:55:43:5c
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Speed: 10000Mb/s
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eth1:
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192.168.1.102/24
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00:00:00:55:43:5d
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Speed: 10000Mb/s
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-unix-check-network-interfaces-names-nic-speed-ip-mac-address/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/ip-command-configure-network-interface-usage-linux/
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[2]: https://www.2daygeek.com/category/shell-script/
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