Get information about your network interface with Linux.

Linux has quite a few commands for finding out information about your network adapters. Below is an example. Using the ethtool command as root.


homer@deusexmachina ~ $ sudo ethtool eth2
[sudo] password for homer:
Settings for eth2:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes

The ethtool command may also be used to get the driver information from the ethernet adapter.


homer@deusexmachina ~ $ sudo ethtool -i eth2
driver: 8139too
version: 0.9.28
firmware-version:
bus-info: 0000:06:02.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

This command may also show the features of the ethernet interface. Use the sudo ethtool -k eth2 command.


homer@deusexmachina ~ $ sudo ethtool -k eth2
Features for eth2:
rx-checksumming: off [fixed]
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on [fixed]
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on [fixed]
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: off
tx-tcp-segmentation: off [fixed]
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp6-segmentation: off [fixed]
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: off [fixed]
tx-vlan-offload: off [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off
rx-all: off
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]

And the ifconfig command is also useful, it shows IP addressing information.


homer@deusexmachina ~ $ sudo ifconfig eth2
eth2 Link encap:Ethernet HWaddr f8:1a:67:10:b1:63
inet addr:192.168.100.4 Bcast:192.168.100.255 Mask:255.255.255.0
inet6 addr: fe80::fa1a:67ff:fe10:b163/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:27539 errors:0 dropped:0 overruns:0 frame:0
TX packets:24493 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21266891 (20.2 MiB) TX bytes:6593141 (6.2 MiB)

Yet another command that may be used to show all network interfaces and IP addresses is the sudo inxi -i command.


homer@deusexmachina ~ $ sudo inxi -i
Network: Card-1: D-Link System RTL8139 Ethernet driver: 8139too
IF: eth1 state: down mac: 00:13:46:3a:02:83
Card-2: Realtek RTL-8139/8139C/8139C+ driver: 8139too
IF: eth2 state: unknown speed: 100 Mbps duplex: full mac: f8:1a:67:10:b1:63
Card-3: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
IF: eth0 state: down mac: 6c:f0:49:b5:e6:2a
WAN IP: xxx.xxx.xxx.xx IF: sit0 ip: N/A IF: eth0 ip: N/A IF: eth1 ip: N/A
IF: eth2 ip: 192.168.100.4

Finally, the ip a command will show all network interfaces on the system.

Get more information about the ip command here: http://www.cyberciti.biz/faq/linux-ip-command-examples-usage-syntax/.

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