Find information about NIC in Linux

Hi All,
          In some scenarios, we want to find out the performance factors of our NIC card attached. Because, if we are working on network for doing some work, then surely we need to transfer data from one system to other. Maximum performance depends on the configuration of NIC Card we are using.

                          
           So here are some command Line tools in Linux to find out useful info.
1.) ethtool
2.) mii-tool
3.) dmesg

1.) ethtool:

[root@server199 ~]# ethtool eth1
Settings for eth1:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 2
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000001 (1)
        Link detected: yes

2.) mii-tool:

[root@server199 ~]# mii-tool -v eth1
SIOCGMIIREG on eth1 failed: Input/output error
eth1: negotiated 100baseTx-FD flow-control, link ok
  product info: vendor 00:50:43, model 11 rev 0
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

3.) dmesg:

 [root@server199 ~]# dmesg | grep -i eth1
e1000e: eth1 NIC Link is Down
e1000e: eth1 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
eth1: 10/100 speed: disabling TSO
e1000e: eth1 NIC Link is Down
e1000e: eth1 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
eth1: 10/100 speed: disabling TSO

Some Terms:

Half-Duplex:
                      A half-duplex (HDX) system provides communication in both directions, but only one direction at a time (not simultaneously).

Full-Duplex:
                      A full-duplex (FDX), or sometimes double-duplex system, allows communication in both directions, and, unlike half-duplex, allows this to happen simultaneously.



   !Hope You will Enjoy

Kuldeep Sharma