Rewrites like GNU's and OpenBSD's support additional features. Optional ability to let another program service establish connections.Hex dump of transmitted and received data.Slow-send mode, one line every N seconds.Can read command line arguments from standard input.Built-in loose source-routing capability.Built-in port-scanning capabilities, with randomization.Ability to use any locally configured network source address.Full DNS forward/reverse checking, with appropriate warnings.Outbound or inbound connections, TCP or UDP, to or from any ports.2.6 Pipe via UDP (-u) with a wait time (-w) of 1 second to "loggerhost" on port 514.2.5 Test whether UDP port is open: simple UDP server and client.2.4 Checking whether UDP ports (-u) 80–90 are open on 192.168.0.1 using zero mode I/O (-z).2.3 Setting up a one-shot webserver on port 8080 to present the content of a file.2.1 Opening a raw connection to port 25.
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