Ifconfig lo, eth0, BR0 interface

ifconfig lo, eth0, br0, Wlan0 interface

Ifconfig Loeth0br0wlan0 Interface Lo Loopback interface eth0 Ethernet interface br0 Network Bridge interface Wlan0 Wireless interface

Lo Loopback interface

Lo Link encap:local Loopback
inet addr:127.0.0.1 mask:255.0.0.0

General Loopback Interface IP v4 address is: 127.0.0.1, subnet mask: 255.255.255.0

Virtual network interface: It is not real, it is not true to receive and send packets from outside, but to receive and send packets within the system, so the virtual network interface does not need drivers. Lo Loopback Address

Why there is this interface.
If the package is generated by a local process for another local process, they will pass through the LO interface of the outbound chain and then return to the Lo interface of the chain Eth0 Ethernet Interface

Eth0 Link encap:ethernet hwaddr 04:7d:7b:7e:6d:19
inet addr:192.168.1.106 bcast:192.168.1.255 mask:255.255.255.0

Ethernet interface and network card corresponding, each hardware network card (a Mac) corresponds to an Ethernet interface , its work is entirely by the corresponding driver control card.

If there is only one physical network card, but there are eth1,eth2, and so on, there may be a wireless network card or multiple virtual network cards, virtual network card by the system created or through the application layer program created, the role of the physical network card similar. br0 Network Bridge Interface

Br0 Link encap:ethernet hwaddr a2:d3:29:ba:51:4b

Network Bridge is a kind of relay in the link layer, the frame of the technology, according to Mac block, can be isolated collision, the network of multiple segments in the data link layer of network equipment.

Br0 can connect two interfaces, such as connecting two Ethernet interfaces eth0 and forwarding frames. Wlan0 Wireless Interface

Wlan0 Link encap:ethernet hwaddr 9c:b7:0d:c0:0b:36
inet addr:192.168.1.115 bcast:192.168.1.255 mask:255.255.255.0

Wireless network card corresponding to the interface, wireless network card also needs the corresponding driver to work.