Use the Ifconfig command to view the network interface address. -a : Show all network interface -s : Show only summary information for network interfaces . use the hostname command to view or modify host names. Use the route command to view the route table entries. The output Information: destination column corresponds to the destination segment address. Gateway corresponds to the address of the next-hop router. iface column corresponds to the network interface that sends the data. Use the route command to add, delete static route records Add, delete route records to the specified network segment: route add Add route records -net options Specify the destination segment's address Gw options to specify the IP address of the next-hop router. such as: #route add -net 18.18.0.0/24 gw 18.18.254.254 Route del Delete route record,-net option specifies the destination segment address in the corresponding route record for example: #route del -net 18.18.23.0/24 Add, delete the default gateway record: route del default gIP address of the w gateway Route add default gw IP address of the gateway use the netstat command to view network connectivity. -a Displays all network connection information in the host. -n displays the associated host address, port, and other information in digital form. -r routing table information. -l Displays the network connection and port information that is in the listening state. Information about the-T  TCP protocol. Information about the-U  UDP protocol. -p Displays the process number, process name information associated with the network connection. -O: Display Network Timer-s: Displays statistics for each network protocol. Netstat -n Command View There are three states: listening is in the listening state, that is, the port is open, waiting for the connection, but not yet connected. Established state, established means to establish a connection. Indicates that two machines are communicating. Time_wait state, time_wait means to end this connection. Use the ping command to test network connectivity, based on the ICMP protocol.-C: Sends a specified number of packets after the exit-I: Specifies the interval between packets-N: Outputs only numeric values. -Q: Displays only the beginning and end of the summary information-r: ignores the normal routing table and sends packets directly to the remote host. -R: Record Routing Process-S: Sets the packet size in bytes, and the default package size is 56 bytes. -T: Sets the size of the Live value TTL use the traceroute command to track the routing of packets. Use the Nslookup,dig,host command to test DNS domain name resolution. Manage remote hosts using the telnet command: the telnet command in addition to remote logins can be managed remotely, there is also a purpose is to detect whether a local or remote host a port is open. The command format is as follows: telnet [option] [host] [port] use Network configuration command: modify the IP address of the network card, subnet mask: ifconfig Network Interface name   IP address netmask[Subnet Mask] ifconfig network interface name   IP address [/subnet mask length] disabled, activating network interface: Ifconfig eth0 down, ifconfig eth0 up Modify Network configuration file: network interface profile: # vim /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE: Network Interface name ONBOOT: whether the network interface is activated at system startup. BOOTPROTO set up how the network interfaces are configured. IPADDR Set IP address NETMASK set subnet mask gateway Set the default gateway address. Host name Profile: # vim /etc/sysconfig/network hostname setting host name NETWORKING=yes Set the default enabled state of the IPV4 network.
Linux System Network Management
