Linux Show List Of Network Cards

lspci command

Type the following command:
# lspci | egrep -i --color 'network|ethernet'
Sample outputs:

09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5761e Gigabit Ethernet PCIe (rev 10)
0c:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300

lshw command

The lshw command can extract detailed information on the hardware configuration of the machine including network cards. Type the following command:
# lshw -class network
Sample outputs:

  *-network DISABLED
       description: Wireless interface
       product: Ultimate N WiFi Link 5300
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:0c:00.0
       logical name: wlan0
       version: 00
       serial: 00:21:6a:ca:9b:10
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-0.bpo.1-amd64 firmware=8.83.5.1 build 33692 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       resources: irq:46 memory:f1ffe000-f1ffffff
  *-network
       description: Ethernet interface
       product: NetXtreme BCM5761e Gigabit Ethernet PCIe
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:09:00.0
       logical name: eth0
       version: 10
       serial: b8:ac:6f:65:31:e5
       size: 1GB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 duplex=full firmware=5761e-v3.71 ip=192.168.1.5 latency=0 link=yes multicast=yes port=twisted pair speed=1GB/s
       resources: irq:48 memory:f1be0000-f1beffff memory:f1bf0000-f1bfffff

ifconfig and ip command

To see all configured network devices, enter:
# ifconfig -a
OR
# ip link show
OR
# ip a
Sample outputs:

1: lo:  mtu 16436 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 mq state UP qlen 1000
    link/ether b8:ac:6f:65:31:e5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.5/24 brd 192.168.1.255 scope global eth0
    inet6 fe80::baac:6fff:fe65:31e5/64 scope link
       valid_lft forever preferred_lft forever
3: wlan0:  mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:21:6a:ca:9b:10 brd ff:ff:ff:ff:ff:ff
4: pan0:  mtu 1500 qdisc noop state DOWN
    link/ether 92:0a:e7:31:e0:83 brd ff:ff:ff:ff:ff:ff
5: vmnet1:  mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:01 brd ff:ff:ff:ff:ff:ff
    inet 192.168.121.1/24 brd 192.168.121.255 scope global vmnet1
    inet6 fe80::250:56ff:fec0:1/64 scope link
       valid_lft forever preferred_lft forever
6: vmnet8:  mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
    inet 192.168.179.1/24 brd 192.168.179.255 scope global vmnet8
    inet6 fe80::250:56ff:fec0:8/64 scope link
       valid_lft forever preferred_lft forever

/proc/net/dev

The dev pseudo-file contains network device status information. This gives the number of received and sent packets, the number of errors and collisions and other basic statistics.
$ cat /proc/net/dev
Sample outputs:

Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:   20097     179    0    0    0     0          0         0    20097     179    0    0    0     0       0          0
vmnet8:       0       0    0    0    0     0          0         0        0      33    0    0    0     0       0          0
  pan0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
 wlan0:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
  eth0: 592509534  623058    0    0    0     0          0      1053 122269656  401567    0    0    0     0       0          0
vmnet1:       0       0    0    0