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Old 06-17-2017, 02:13 AM   #1
hack3rcon
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Post Find which NIC plugged.


Hello.
I installed CentOS 7 x64 on a system via 4 NIC, But just one NIC cable is connected. The DHCP server is not enabled too and I want to configure my NIC manually, But how can I find the name of NIC that cable plugged to it?

Thank you.
 
Old 06-17-2017, 04:10 AM   #2
ferrari
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You can get the link state for each device node present using the ip command...
Code:
ip link
 
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Old 06-17-2017, 04:25 AM   #3
aragorn2101
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Just to build up on what ferrari correctly advised, I'll post outputs for the ip command so that you see how you will identify the connected NIC.
I have only one NIC but you'll spot the difference easily.

When network cable is connected:
Code:
# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1
    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 mode DEFAULT qlen 1000
    link/ether 3c:xx:xx:xx:xx:49 brd ff:ff:ff:ff:ff:ff
When network cable is disconnected:
Code:
# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1
    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 mode DEFAULT qlen 1000
    link/ether 3c:xx:xx:xx:xx:49 brd ff:ff:ff:ff:ff:ff
Spot the NO-CARRIER and state DOWN?

Last edited by aragorn2101; 06-17-2017 at 04:28 AM.
 
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Old 06-17-2017, 06:18 AM   #4
hack3rcon
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Thank you so much.
 
  


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