Linux notes--Network configuration ifconfig and IP

Mac:media Access contro

Coaxial transmission signal

Line arbitration: At some point which annotations can use this transmission medium

CSMA/CD: Carrier audiometry Multi-access, conflict detection (Ethernet Ethernet)

Repeater: Amplification voltage, the electron in the transmission process will collide, voltage drop

Bridge: Divide the main axis of the host into two parts, reduce the signal conflict, different parts of the host can send a signal

Switch: In fact, the multi-port bridge is a switch, can be divided into many parts of the coaxial host, can communicate with each other, but also can communicate with different host

Subnet Mask: Compute network address based on IP address

IPV4: Dotted decimal, four part three points separated, each part consists of 8 bits binary

IPV4 Category: A 1-126 (127 for loopback) B 128-191 C 192-223 D 224-239 E 240-255
Subnet mask for Class A: 255.0.0.0 (8)
Subnet mask corresponding to Class B: 255.255.0.0 (16)
Subnet mask corresponding to Class C: 255.255.255.0 (24)

Private addresses cannot be used to surf the Internet:
A:10.0.0.0/8
B:172.16.0.0/16--172.31.0.0/16
C:192.168.0.0/24--192.168.255.0/24

Routing
Host route: The destination address is a host
Network routing: The destination address is a network

Ifonfig:-A: Displays configuration information for all interfaces Ifconfig [eth#]: Specify View ifconfig eth# 10.1.1.4/8 (ip/mask) [up | down]: Specify the IP address and subnet mask for a device
The configured address takes effect immediately, but restarting the network service or host fails the RH5 network file:/etc/init.d/network {start | stop | restart | statas} RH6 Network configuration file:/etc/networkmanag er/networkmanager.conf {Start | stop | restart | statas}

Gateway: Route add Add Route del Delete (-host: Host route-net: Network route default: Routing without parameters) route No parameter view local route (U: local network ug: Gateway route)-N: Digital display of each host or Port
Example: Route add default GW (Nexthop)
Route Del-net 10.0.0.1/8
Route del Default
Changes take effect immediately, but restart Network service or host after failure profile:/etc/sysconfig/network Interface profile:/ETC/SYSCONFIG/NETWORK-SCRIPTS/IFCFG Interface Name (device: Associated unit name To be consistent with the second half of the file name Bootproto: {static | none | DHCP | BOOTP} Boot Protocol IPADDR:IP address Netwask: Subnet mask Gateway: Set Gateway route Onboot: Automatically activates this interface HWADDR: Hardware address (can save) Userctl: {yes | No} allows ordinary users to control this interface Peerdns: {yes | No} whether the DNS address specified by the DHCP server is accepted when Bootproto is DHCP)
Does not take effect immediately, restarting the network service or host will take effect (/etc/init.d/network restart)
Static address: Use Static or none (DHCP means get address using DHCP server)

Adding routes manually
Add File:/etc/sysconfig/network-scripts/route-eth#
Add format one: DEST via Nexthop
Add format two: addresso= (IP)
netmashko= (Gateway)
Gatemayo= (Next hop address)

DNS server specified method:/etc/resolv.conf
NameServer dns-ip-1
NameServer dns-ip-2
Specify local resolution:/etc/host
Host IP---Host name---host Alias
DNS-----
(hostname hostname: can also change host name, effective immediately, but not permanently)
Setup: Command graphical interface to modify the network and save directly to the configuration file

Ip:ip Link View the configuration properties of the network Interface (addr protocol address Route route address) Ip-s Link Show: Detailed statistics IP link set dev (device name) {up | Down}
IP addr Add ADDRESS dev Dev
IP addr del ADDRESS dev Dev
IP addr Show Dev dev to PREFIX
IP addr Flush Dev dev to PREFIX

Netstat command:
-N with Digital display
-R Display Routing table
-T TCP connection established
-U appears UDP connection
-L display connection for listening status
-P Displays the process number and process name of the process that listens on the specified socket

This article is from the "stupid Bird first-FAI" blog, please be sure to keep this source http://benniaoxianhui.blog.51cto.com/10463960/1679217

Linux notes--Network configuration ifconfig and IP