https://access.redhat.com/solutions/1465433

How to find out if the ethernet cable is plugged into the physical interface without bringing up an interface?

SOLUTION 已验证 - 已更新 2015年十一月26日17:18 -

English

环境

Red Hat Enterprise Linux
- 6.x

问题

How to check if the ethernet cable is plugged into the physical interface without bringing up an interface?

决议

For checking the status of the ethernet cable use ip link command.

1) If the ethernet cable is connected, and it is up also then it will show in the ip link command. Check the output of eth0.

Raw

# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 5000link/ether 00:16:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:16:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff

In this case, eth0 <BROADCAST,MULTICAST,UP,LOWER_UP> is connected , and the status of the ethernet cable is also Up "state UP qlen 5000".

2) If ethernet cable is connected, but it is down then check below output:

Raw

# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 5000link/ether 00:16:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:16:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff

In this case, eth0 <NO-CARRIER,BROADCAST,MULTICAST,UP> is connected, but the status of the ethernet cable is down.

3) If ethernet cable is not connected,then check below output:

In this nothing will come.

Raw

# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:16:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff

How to find out if the ethernet cable is plugged into the physical interface without bringing up NIC相关推荐

USB C应该简化我们的生活，而不是一团糟
重点 (Top highlight) 调试器 (Debugger) Techies hailed USB-C as the future of cables when it hit the mains ...
Demystifying Ethernet Types— Difference between Cat5e, Cat 6, and Cat7
Demystifying Ethernet Types- Difference between Cat5e, Cat 6, and Cat7 Ethernet represents the plu ...
Power over Ethernet Switch - PoE 交换机
Power over Ethernet Switch - PoE 交换机 For some NVR / IP camera setups, it may be necessary to use an ...
10G Ethernet Mac IP核
目录 1. 10G以太网结构 1.1 以太网媒体接入控制器(MAC) 1.2 物理接口收发器(PHY) 2.1 IP核使用 2.2 example 代码说明 1. 10G以太网结构一个完整的10G以 ...
今晚 8 点直播 | OpenCV 20 年，首款开源软硬一体的 OAK 套件来了！
从 2000 年首个开源 OpenCV Alpha 版本,到不久前刚刚发布的 OpenCV 4.4,跨平台计算机视觉库 OpenCV 在不知不觉间已经走过了 20 个年头. 相信不少 IT.AI 的从 ...
CCNA1 - Final Exam Answers (04/18/2008 10:30)
1.Which physical network topology is easy to monitor and troubleshoot, easy to add new devices to as ...
cisco网络故障处理手册
故障处理方法一.网络的复杂性一般网络包括路由.拨号.交换.视频.WAN(ISDN.帧中继.ATM.-).LAN.VLAN.- 二.故障处理模型 1. 界定问题(Define the Probl ...
某网络专业人士笔记（超级珍藏）
第1章故障处理方法一.网络的复杂性一般网络包括路由.拨号.交换.视频.WAN(ISDN.帧中继.ATM.-).LAN.VLAN.- 二.故障处理模型 1. 界定问题(Define the Pro ...
鸟哥的Linux私房菜(服务器)- 第四章、连上 Internet
第四章.连上 Internet 最近更新日期:2011/07/20 终于要来到修改 Linux 网络参数的章节了!在第二章的网络基础中, 我们知道主机要连上 Internet 需要一些正确的网络参数设 ...

How to find out if the ethernet cable is plugged into the physical interface without bringing up NIC

How to find out if the ethernet cable is plugged into the physical interface without bringing up an interface?

环境

问题

决议

How to find out if the ethernet cable is plugged into the physical interface without bringing up NIC相关推荐

最新文章

热门文章