![]() Specifies the IP of the interface used to send the packets. Specifies that source or destination ports should be chosen randomly instead of sequentially in a range or in the order the system assigns them.Įnables the RFC 2385 TCP MD5 signature option. Specifies the source port nc should use, subject to privilege restrictions and availability.Īfter EOF on stdin, wait the specified number of seconds and then quit. Proxy authentication is only supported for HTTP CONNECT proxies at present. If no username is specified, then authentication is not attempted. Specifies a username to present to a proxy server that requires authentication. Specifies the size of the TCP send buffer. ![]() Additionally, any timeouts specified with the -w option are ignored.ĭo not do any DNS or service lookups on any specified addresses, hostnames or ports. It is an error to use this option in conjunction with the -p, -s, or -z options. Used to specify that nc should listen for an incoming connection rather than initiate a connection to a remote host. It is an error to use this option without the -l option. Also, causes a delay time between connections to multiple ports.įorces nc to stay listening for another connection after its current connection is completed. Specifies a delay time interval between lines of text sent and received. Specifies the size of the TCP receive buffer. Shell-script based HTTP clients and servers.At the same time, it is a feature-rich network debugging and exploration tool since it can create almost any kind of connection you would need and has several interesting built-in capabilities. It is designed to be a reliable "back-end" tool, used directly or driven by other programs and scripts. Netcat is a utility that reads and writes data across network connections, using the TCP or UDP protocol.
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