From af5bcac0b200667e223b853f0cbd67a200d6f755 Mon Sep 17 00:00:00 2001 From: DarkSun Date: Wed, 22 Apr 2020 00:53:54 +0800 Subject: [PATCH] =?UTF-8?q?=E9=80=89=E9=A2=98:=2020200422=20How=20to=20Che?= =?UTF-8?q?ck=20the=20Available=20Network=20Interfaces,=20Associated=20IP?= =?UTF-8?q?=20Addresses,=20MAC=20Addresses,=20and=20Interface=20Speed=20on?= =?UTF-8?q?=20Linux?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit sources/tech/20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux.md --- ...Addresses, and Interface Speed on Linux.md | 202 ++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 sources/tech/20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux.md diff --git a/sources/tech/20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux.md b/sources/tech/20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux.md new file mode 100644 index 0000000000..ca7e8fe2aa --- /dev/null +++ b/sources/tech/20200422 How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux.md @@ -0,0 +1,202 @@ +[#]: collector: (lujun9972) +[#]: translator: ( ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux) +[#]: via: (https://www.2daygeek.com/linux-unix-check-network-interfaces-names-nic-speed-ip-mac-address/) +[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) + +How to Check the Available Network Interfaces, Associated IP Addresses, MAC Addresses, and Interface Speed on Linux +====== + +By default when you set up the server you will configure the primary network interface. + +This is part of the build work that everyone does. + +Sometimes you may need to configure an additional network interface for several reasons. + +This could be a network bonding/teaming or high availability or a separate interface for application requirements or backups. + +To do so, you need to know how many interfaces your computer has and their speed to configure it. + +There are many commands to check for available network interfaces, but we only use the IP command. + +Later we will write a separate article with all these tools. + +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. + +### What’s IP Command + +**[IP command][1]** is similar to ifconfig, which is used to for assigning Static IP Address, Route & Default Gateway, etc., + +``` +# ip a + +1: lo: mtu 65536 qdisc noqueue state UNKNOWN + link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 + inet 127.0.0.1/8 scope host lo + inet6 ::1/128 scope host + valid_lft forever preferred_lft forever +2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000 + link/ether fa:16:3e:a0:7d:5a brd ff:ff:ff:ff:ff:ff + inet 192.168.1.101/24 brd 192.168.1.101 scope global eth0 + inet6 fe80::f816:3eff:fea0:7d5a/64 scope link + valid_lft forever preferred_lft forever +``` + +### What’s ethtool Command + +The ethtool is used to query or control network driver and hardware settings. + +``` +# ethtool eth0 +``` + +### 1) How to Check the Available Network Interfaces on Linux Using the IP Command + +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. + +``` +# ip a |awk '/state UP/{print $2}' + +eth0: +eth1: +``` + +### 2) How to Check the IP Address of a Network Interface on Linux Using the IP Command + +If you only want to see which IP address is assigned to which interface, use the following customized IP command. + +``` +# ip -o a show | cut -d ' ' -f 2,7 +or +ip a |grep -i inet | awk '{print $7, $2}' + +lo 127.0.0.1/8 +192.168.1.101/24 +192.168.1.102/24 +``` + +### 3) How to Check the Network Interface Card MAC Address on Linux Using the IP Command + +If you only want to see the network interface name and the corresponding MAC address, use the following format. + +To check a specific network interface MAC address. + +``` +# ip link show dev eth0 |awk '/link/{print $2}' +00:00:00:55:43:5c +``` + +To check MAC address for all network interface. + +``` +# vi /opt/scripts/mac-addresses.sh + +#!/bin/sh +ip a |awk '/state UP/{print $2}' | sed 's/://' | while read output; +do +echo $output: +ethtool -P $output +done +``` + +Run the below shell script to get the MAC address for multiple network interfaces. + +``` +# sh /opt/scripts/mac-addresses.sh + +eth0: +Permanent address: 00:00:00:55:43:5c +eth1: +Permanent address: 00:00:00:55:43:5d +``` + +### 4) How to Check the Network Interface Port Speed on Linux Using the ethtool Command + +If you want to check the network interface port speed on Linux, use the ethtool command. + +To check the speed of a particular network interface port. + +``` +# ethtool eth0 |grep "Speed:" + +Speed: 10000Mb/s +``` + +To check the port speed for all network interfaces. + +``` +# vi /opt/scripts/port-speed.sh + +#!/bin/sh +ip a |awk '/state UP/{print $2}' | sed 's/://' | while read output; +do +echo $output: +ethtool $output |grep "Speed:" +done +``` + +Run the below shell script to get the port speed for multiple network interfaces. + +``` +# sh /opt/scripts/port-speed.sh + +eth0: +Speed: 10000Mb/s +eth1: +Speed: 10000Mb/s +``` + +### 5) Shell Script to Verify Network Interface Card Information + +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. + +``` +# vi /opt/scripts/nic-info.sh + +#!/bin/sh +hostname +echo "-------------" +for iname in $(ip a |awk '/state UP/{print $2}') +do +echo "$iname" +ip a | grep -A2 $iname | awk '/inet/{print $2}' +ip a | grep -A2 $iname | awk '/link/{print $2}' +ethtool $iname |grep "Speed:" +done +``` + +Run the below shell script to check network card information. + +``` +# sh /opt/scripts/nic-info.sh + +vps.2daygeek.com +---------------- +eth0: +192.168.1.101/24 +00:00:00:55:43:5c +Speed: 10000Mb/s +eth1: +192.168.1.102/24 +00:00:00:55:43:5d +Speed: 10000Mb/s +``` + +-------------------------------------------------------------------------------- + +via: https://www.2daygeek.com/linux-unix-check-network-interfaces-names-nic-speed-ip-mac-address/ + +作者：[Magesh Maruthamuthu][a] +选题：[lujun9972][b] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://www.2daygeek.com/author/magesh/ +[b]: https://github.com/lujun9972 +[1]: https://www.2daygeek.com/ip-command-configure-network-interface-usage-linux/ +[2]: https://www.2daygeek.com/category/shell-script/