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# Linux nc Command [ Linux Command Manual](#) The Linux nc command is used to set up routers. Executing this command allows you to set relevant parameters for the router. ### Syntax nc [-v...][port...] **Parameter Description**: * -g Set router hop gateway, up to 8 can be set. * -G Set source routing pointer, its value must be a multiple of 4. * -h Online help. * -i Set time interval for sending information and scanning ports. * -l Use listening mode to control incoming data. * -n Use IP address directly without going through domain name server. * -o Specify file name to dump the transmitted data in hexadecimal to that file. * -p Set the port used by the local host. * -r Randomly specify ports for local and remote hosts. * -s Set the IP address from which the local host sends packets. * -u Use UDP transport protocol. * -v Display command execution process. * -w Set connection waiting time. * -z Use 0 input/output mode, only used when scanning ports. ### Examples TCP port scan # 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 ports on 192.168.0.3 in the range 1-100 Scan UDP ports # nc -u -z -w2 192.168.0.1 1-1000 //Scan ports on 192.168.0.3 in the range 1-1000 Scan specified port # nc -nvv 192.168.0.1 80 //Scan port 80 (UNKNOWN) [192.168.0.1] 80 (?) open y //User input [ Linux Command Manual](#)