Linux Network commands

The number of times a 1.ping command is followed by the-c parameter to connect to a flat link

Ping-c 10 127.0.0.1

means to stop after PING10 times

2. nslookup command to see how many IP addresses the domain name resolves

[Email protected]:/etc$ nslookup baidu.comserver:127.0.1.1Address:127.0.1.1# -Non-authoritative answer:Name:baidu.comAddress:220.181.57.216Name:baidu.comAddress:111.13.101.208[email protected]:/etc$ Ping baidu.comping baidu.com (220.181.57.216) About( -) bytes of data. -bytes from 220.181.57.216: icmp_seq=1Ttl= -Time=39.0Ms -bytes from 220.181.57.216: icmp_seq=2Ttl= -Time=95.6Ms -bytes from 220.181.57.216: icmp_seq=3Ttl= -Time=37.1Ms^x64 bytes from 220.181.57.216: icmp_seq=4Ttl= -Time=37.1Ms

3.route Routing command to view route map information

Parameter:-n means to view the routing information that is cached on the host

[Email protected]:/etc$ Route-n Kernel IP routing table Destination gateway subnet Mask flag Hop reference use interface0.0.0.0         192.168.10.254  0.0.0.0Ug -    0        0Ens33169.254.0.0     0.0.0.0         255.255.0.0U +   0        0Ens33192.168.10.0    0.0.0.0         255.255.255.0U -    0        0Ens33

To add a default gateway:

Route add default GW 192.168.10.255

To delete a gateway:

Route del default GW 192.168.10.255

4. Network Statistics view command: Netstat

To view the current network statistics command:

Netstat-a for viewing all network statistics that contain listening information

-R view routes can be used with-a

[Email protected]:/etc$ netstat-ar core IP routing table destination Gateway genmask Flags MSS Window irtt Ifacedefault         192.168.10.254  0.0.0.0Ug0 0          0Ens33link-local *255.255.0.0U0 0          0Ens33192.168.10.0*255.255.255.0U0 0          0Ens33

Netstat-t for displaying information about the TCP protocol-T

[Email protected]:/etc$ netstat-t Activate Internet connection (W/o Server) Proto Recv-Q send-Q Local Address Foreign address State TCP0      0 192.168.10.168: SSH192.168.10.1:60139establishedtcp1      0 192.168.10.168:52724    123.150.8.42:8001close_wait TCP1      0 192.168.10.168:52722    123.150.8.42:8001Close_wait

Linux Network commands