Serial flow control, either software (XON/XOFF) or hardware (CTS/RTS or DSR/DTR) is controlled through getty(8). Have a look at the man page for getty and peruse the related files /etc/ttys and /etc/gettytab. There's also a useful Handbook page here: http://www.freebsd.org/doc/handbook/serial.html
I struggled for years trying to get good flow control to high speed terminals and it never worked to my satisfaction. In the end I accepted a lower data rate (9600 Baud) and no flow control.
[Edit] Further information: If you don't use flow control you can use simpler serial cables but you need to change std.9600 to 3wire.9600 in /etc/ttys.
Thanks but it wasn't my aim. I want use flow control for a network interface in FreeBSD because I must do a test and I can't because flow control is enable. Is it enable as default?
How I can disable it?
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