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1.1.1. Identify Ethernet Interfaces


To quickly identify all available Ethernet interfaces, you can use the ip command as shown below.


ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000

link/ether 00:16:3e:e2:52:42 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet 10.102.66.200/24 brd 10.102.66.255 scope global dynamic eth0

valid_lft 3257sec preferred_lft 3257sec inet6 fe80::216:3eff:fee2:5242/64 scope link

valid_lft forever preferred_lft forever


Another application that can help identify all network interfaces available to your system is the lshw command. This command provides greater details around the hardware capabilities of specific adapters. In the example below, lshw shows a single Ethernet interface with the logical name of eth0 along with bus information, driver details and all supported capabilities.


sudo lshw -class network

*-network

description: Ethernet interface

product: MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] vendor: Mellanox Technologies

physical id: 0

bus info: pci@0004:01:00.0 logical name: eth4 version: b0

serial: e4:1d:2d:67:83:56

slot: U78CB.001.WZS09KB-P1-C6-T1

size: 10Gbit/s capacity: 10Gbit/s width: 64 bits clock: 33MHz



capabilities: pm vpd msix pciexpress bus_master cap_list ethernet physical fibre 10000bt-fd

configuration: autonegotiation=off broadcast=yes driver=mlx4_en driverversion=4.0-0 duplex=full firmware=2.9.1326 ip=192.168.1.1 latency=0 link=yes multicast=yes port=fibre speed=10Gbit/s

resources: iomemory:24000-23fff irq:481 memory:3fe200000000-3fe2000fffff memory:240000000000-240007ffffff


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