First, the content of points:
1, view network settings
2, test the network connection
3, using a network configuration commands
4, modify the network configuration file
Second, view network settings
1, view network interface information ifconfig
View all active network interfaces
Ifconfig command is executed
Check the specified network interface information
ifconfig network interface number
2, view the host name hostname
[Root @ localhost ~] # hostname hostname View
[Root @ localhost ~] # hostnamectl set-hostname http01 modify the hostname
3, check the routing table entry route
route command: To view or set the host routing table information
route [-n] or direct route
4, check the network connectivity netstat
netstat command: network connection status viewing system, routing tables, interface statistics and other information
netstat [options]
Common options
-a: List all
-n: Digital Representation
-p: Agreement
-t: lists tcp connection protocol
-u: list udp protocol connection
-r: lists the routing table information
neistat -ntap View all tcp protocol interface information represented in digital form
neistat -nuap View all udp protocol interface information represented in digital form
neistat -r to see the routing table information, like route
Third, test the network connection
a, ping command: to test network connectivity
ping [options] target host
b, with trace packets traceroute
traceroute command: test (used to determine fault) current from passing between the host to the destination host a network node
tracerouter target host address
c, DNS nslookup
nslookup command: Testing DNS resolution.
nslookup target host address
Fourth, set network parameters manner
1, temporary configuration - adjust the network parameters using the command
Simple, fast, can directly modify the operation of the network parameters
Generally only suitable for use in the process of debugging the network
After a system reboot, your changes will fail
2, fixed - to modify the network configuration file parameters
Modify the configuration file of the network parameters
Suitable for use when fixed parameter settings server
Network services need to reload or restart to take effect later
1, a network interface parameters ifconfig
a, set the network interface IP address, subnet mask (provisional setting)
ifconfig interface number IP address [netmask Subnet Mask]
ifconfig network interface IP address [/ mask length]
b, disabled or re-activate the card
ifconfig network interface up
ifconfig network interface down
C, is provided a virtual network interface (NIC a different public ip, implement multiple IP addresses)
ifconfig interface number: Serial number IP address
2, set the record route route
a, add a route to the specified recording segment
route add -net network address gw IP address
b, delete the route to record the specified network.
route del -net network address
Default Gateway record c, delete routing table
route del default gw IP address
d, default gateway records added to the routing table
route add default gw IP address
