Description Decimal Code Action WILL 251 Sender wants to do something. DO 252 Sender wants the other end to do something. WONT 253 Sender does not want to do something. 254 Sender wants the other not to do something. The sender would like to use a certain facility if the receiver can handle it.
Option is now in effect.
WILL DONT Receiver says it cannot support the option. Option is not in effect. The sender says it can handle traffic from the sender if the sender wishes to use a certain option. Option is now in effect. DO WONT Receiver says it cannot support the option.