-s, --source [!] address[/mask]
Source specification. Address can be either a network name, a hostname (please note that specifying any name
to be resolved with a remote query such as DNS is a really bad idea), a network IP address (with /mask), or a
plain IP address. The mask can be either a network mask or a plain number, specifying the number of 1's at the
left side of the network mask. Thus, a mask of 24 is equivalent to 255.255.255.0. A "!" argument before the
address specification inverts the sense of the address. The flag --src is an alias for this option.
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