Linux Management Network Connection instructions

Ethtool eth0 View the settings of the eth0 corresponding network card

Ethtool-i eth0 View driver information for eth0 NIC

ethtool-s eth0 viewing network card statistics

Ethtool-s eth0 speed of duplex full Autoneg off to turn off auto-negotiation, set the network card to 100Mbps fully duplex mode

Ethtool-s eth0 speed Duplex half Autoneg off

The above modifications are only valid for the current session, and the original settings are restored after the system restarts. To make the modified settings still valid after the system restarts or after the network is turned on, you must add the appropriate options to the etftool_opts line of the/etc/sysconfig/network-scripts/ifcfg-eth0 file

Ethtool_opts= "Speed of Deplex full Autoneg off"

If the NIC model is very old, you can use Mii-tool to view it accordingly.

Mii-tool eth0 Display the negotiation rate and connection status of the video card

Mii-tool-v eth0 Display the detailed settings of the NIC

The netstat command provides a way to obtain network interface statistics

Netstat-i getting Eth0 Network interface statistics

Netstat-ic Refresh once per second

You can watch the netstat-i with watch.

Network-related partial control scripts and configuration files are located in the/etc/sysconfig/network-scripts directory

/usr/share/doc/initscripts-*/sysconfig.txt file records netscripts related information

Script/etc/init.d/network is responsible for starting the configured network-scripts file

Service Start Stop Restart network interface

Service Network Stop

Service Network start

Service Network restart

Service network status to view the state of the Web interface

Chkconfig can set the network interface to self-boot when booting

Chkconfig Network on Start-Up Networking interface

Chkconfig--list Network View networking switch conditions at different network levels

When a system contains multiple network interfaces, you can use Ifdown ifup to close or open an interface

Ifdown eth0

Ifup eth0

Ifconfig command to view the address of the NIC MAC address and TCP/IP connection

Ifconfig eth0

The IP command not only displays information about the network interface, but also changes the network device, routing, IP tunneling settings

Lspci | Grep-i Wireless can see the model of the PCI wireless network card

Iwconfig viewing and modifying the wireless card interface information

Hostname View native DNS hostnames throughout

Hostname-s View native hostname abbreviation

hostname-d Viewing native domain names

DnsDomainName Viewing native domain names

Hostname name sets the native host name

Check for network failure

IP route checks the default gateway in the actual routing table

Ping the IP address of the default gateway to determine if the gateway's IP layer is connected

--Check the Address Resolution Protocol

Arp-v the ARP cache entry by host list

ARP-VN listing ARP cache entries by IP address

arp-d IP Address Delete an entry in the ARP cache

Arp-s IP Address MAC address to add entries to the ARP cache

IP neighbour can also achieve these functions

--track the routing to the host

Traceroute Address

Traceroute-i using ICMP packet tracing

TRACEROUTE-T using TCP Message Tracking

Traceroute-p port number is connected by default 80

Traceroute-n turn off name resolution when tracing

Tracepath addresses use UDP to track routes

Route Display native routing table information

Route-n Show routing table, do not do DNS resolution

The route add default GW 10.0.0.2 adds 10.0.0.2 as the Defaults gateway

Route add-net 192.168.0.0 netmask 255.255.255.0 ETH0/GW 10.0.0.100 Add new routes to the network by specifying a network port or gateway IP address

Route del-net 193.168.0.0 netmask 255.255.255.0 Delete route

Linux Management Network Connection instructions