Netcat命令介绍及实践

1.Windows系统nc工具使用方法

[v1.10 NT]
connect to somewhere:   nc [-options] hostname port[s] [ports] ...
listen for inbound:     nc -l -p port [options] [hostname] [port]
options:
        -d              detach from console, stealth mode

        -e prog         inbound program to exec [dangerous!!]
        -g gateway      source-routing hop point[s], up to 8
        -G num          source-routing pointer: 4, 8, 12, ...
        -h              this cruft
        -i secs         delay interval for lines sent, ports scanned
        -l              listen mode, for inbound connects
        -L              listen harder, re-listen on socket close
        -n              numeric-only IP addresses, no DNS
        -o file         hex dump of traffic
        -p port         local port number
        -r              randomize local and remote ports
        -s addr         local source address
        -t              answer TELNET negotiation
        -u              UDP mode
        -v              verbose [use twice to be more verbose]
        -w secs         timeout for connects and final net reads
        -z              zero-I/O mode [used for scanning]
port numbers can be individual or ranges: m-n [inclusive]

2.Windows版nc工具（免安装）

下载连接：https://download.csdn.net/download/Whenbeen/12393406

 

3.Linux系统nc命令使用方法

Ncat 7.50 ( https://nmap.org/ncat )
Usage: ncat [options] [hostname] [port]

Options taking a time assume seconds. Append 'ms' for milliseconds,
's' for seconds, 'm' for minutes, or 'h' for hours (e.g. 500ms).
  -4                         Use IPv4 only
  -6                         Use IPv6 only
  -U, --unixsock             Use Unix domain sockets only
  -C, --crlf                 Use CRLF for EOL sequence
  -c, --sh-exec    Executes the given command via /bin/sh
  -e, --exec       Executes the given command
      --lua-exec  Executes the given Lua script
  -g hop1[,hop2,...]         Loose source routing hop points (8 max)
  -G                     Loose source routing hop pointer (4, 8, 12, ...)
  -m, --max-conns        Maximum simultaneous connections
  -h, --help                 Display this help screen
  -d, --delay         Wait between read/writes
  -o, --output    Dump session data to a file
  -x, --hex-dump  Dump session data as hex to a file
  -i, --idle-timeout  Idle read/write timeout
  -p, --source-port port     Specify source port to use
  -s, --source addr          Specify source address to use (doesn't affect -l)
  -l, --listen               Bind and listen for incoming connections
  -k, --keep-open            Accept multiple connections in listen mode
  -n, --nodns                Do not resolve hostnames via DNS
  -t, --telnet               Answer Telnet negotiations
  -u, --udp                  Use UDP instead of default TCP
      --sctp                 Use SCTP instead of default TCP
  -v, --verbose              Set verbosity level (can be used several times)
  -w, --wait          Connect timeout
  -z                         Zero-I/O mode, report connection status only
      --append-output        Append rather than clobber specified output files
      --send-only            Only send data, ignoring received; quit on EOF
      --recv-only            Only receive data, never send anything
      --allow                Allow only given hosts to connect to Ncat
      --allowfile            A file of hosts allowed to connect to Ncat
      --deny                 Deny given hosts from connecting to Ncat
      --denyfile             A file of hosts denied from connecting to Ncat
      --broker               Enable Ncat's connection brokering mode
      --chat                 Start a simple Ncat chat server
      --proxy  Specify address of host to proxy through
      --proxy-type    Specify proxy type ("http" or "socks4" or "socks5")
      --proxy-auth    Authenticate with HTTP or SOCKS proxy server
      --ssl                  Connect or listen with SSL
      --ssl-cert             Specify SSL certificate file (PEM) for listening
      --ssl-key              Specify SSL private key (PEM) for listening
      --ssl-verify           Verify trust and domain name of certificates
      --ssl-trustfile        PEM file containing trusted SSL certificates
      --ssl-ciphers          Cipherlist containing SSL ciphers to use
      --version              Display Ncat's version information and exit
 

4.实践：Windows系统nc工具配合Linux系统nc命令使用

4.1 查看Linux系统IP地址

4.2 Linux系统通过nc命令监听7777端口

4.3 查看Windows系统IP地址

4.4 Windows系统通过nc.exe与Linux系统ip地址建立TCP连接

4.5三次握手抓包信息

4.6 发送数据检查通信状态

Windows发送：

Linux接收:

Linux系统收到Windows系统发送的消息，能够正常通信。

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