Nc/netcat/ncat/nmap/socat Tips

[Overview]

To be clear, nc and netcat are the same thing, ncat is part of the nmap suite, and ncat and socat both claim to be enhanced versions of nc.

Scocat ports release slowly.

[Echo]

1. TCP echo

1.1 Only echo, not print.

ncat -c cat -k -l 6666ncat -e /bin/cat -k -l 6666

1.2, echo and print.

socat -d -d -v tcp-l:6666,fork exec:'/bin/cat' #Two-d's to show connection status

2. UDP echo.

ncat -c cat -k -u -l 6666ncat -e /bin/cat -k -u -l 6666

[Chat]

1. Ncat one-on-one chat. (Print does not echo)

host1$ ncat -lp 6666host2$ ncat host1 6666

2, NC one-on-one chat. (Same as NCAT)

host1$ nc -lp 6666host2$ nc host1 6666

[Port forwarding]

TCP port forwarding. (ncat port forwarding)

#Listen on native port 7777 and forward data to 192.168.7.8 port 8888 ncat --sh-exec "ncat 192.168.7.8 8888" -l 7777 --keep-open

[nmap common scanning command]

#Quickly scan the famous ports of one host nmap -F -n -sTU -v 192.168.0.xx#Quickly scan the famous ports of multiple hosts nmap -F -n -sTU -v 192.168.0.130-168#Scan the ports of 20-200 nmap -n -sTU -v -p 20-200 192.168.0.xx

[Scan dhcp server]

1. DHCP protocol details

2, Nmap scanning tutorial network basic services DHCP service class

#broadcast (broadcast-dhcp-discover) nmap --script broadcast-dhcp-discover#Specify host.（dhcp-discover）nmap -sU -p 67 --script=dhcp-discover 192.168.0.xx

Related Reading: King of Port Scanning--nmap Introduction (1)

*** walker ***