12.2 Telnet Protocol Commands
The IAC (Interpret As Command) character’s decimal value is 255 (FF in the hexadecimal notation) and is of special significance. If a character of this value is to be transmitted, it must be doubled. The IAC character is interpreted as the beginning of a Telnet protocol command.
This means the IAC character may be followed by the commands listed in the following table:
|
Command |
Significance | ||
|---|---|---|---|
|
Decimal Notation |
Hexadecimal Notation |
Symbol | |
|
236 |
EC |
EOF |
End of file |
|
237 |
ED |
SUSP |
Suspend process |
|
238 |
EE |
ABORT |
Abort process |
|
239 |
EF |
EOR |
End of record |
|
240 |
F0 |
SE |
Sub option end |
|
241 |
F1 |
NOP |
No operation |
|
242 |
F2 |
DM |
Data mark (usually mark urgent data in TCP segment) |
|
243 |
F3 |
BRK |
Break process |
|
244 |
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