Linux nc Command

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The Linux nc command is used to set up routers.

Executing this command can set the related parameters of the router.

Syntax

nc [-hlnruz][-g<网关...>][-G<指向器数目>][-i<延迟秒数>][-o<输出文件>][-p<通信端口>][-s<来源位址>][-v...][-w<超时秒数>][主机名称][通信端口...]

Parameter Description：

  • -g<gateway> Set the router hop communication gateway, up to 8 can be set.
  • -G<number of pointers> Set the source route pointer, whose value is a multiple of 4.
  • -h Online help.
  • -i<delay seconds> Set the time interval for sending information and scanning communication ports.
  • -l Use listening mode to control incoming data.
  • -n Use IP addresses directly, without going through the domain name server.
  • -o<output file> Specify the file name, and dump the transmitted data in hexadecimal code into the file for storage.
  • -p<communication port> Set the communication port used by the local host.
  • -r Randomly specify the communication ports of the local and remote hosts.
  • -s<source address> Set the IP address of the data packets sent by the local host.
  • -u Use the UDP transmission protocol.
  • -v Display the command execution process.
  • -w<timeout seconds> Set the time to wait for the connection.
  • -z Use 0 input/output mode, only used when scanning communication ports.

Examples

TCP port scanning

# nc -v -z -w2 192.168.0.3 1-100 
192.168.0.3: inverse host lookup failed: Unknown host
(UNKNOWN) [192.168.0.3] 80 (http) open
(UNKNOWN) [192.168.0.3] 23 (telnet) open
(UNKNOWN) [192.168.0.3] 22 (ssh) open

Scan port range 1-100 of 192.168.0.3

Scan UDP ports

# nc -u -z -w2 192.168.0.1 1-1000 //扫描192.168.0.3 的端口 范围是 1-1000

Scan the specified port

# nc -nvv 192.168.0.1 80 //扫描 80端口
(UNKNOWN) [192.168.0.1] 80 (?) open
y  //用户输入

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