?? tyt06fi.htm
字號:
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Don't
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>254
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Demands that the other end stop performing or confirms that the other end is no longer performing
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Erase Character (EC)
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>247
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Erases a character in the output stream
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Erase Line (EL)
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>248
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Erases a line in the output stream
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Go Ahead (GA)
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>249
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Indicates permission to proceed when using half-duplex (no echo) communications
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Interpret as Command (IAC)
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>255
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Interprets the following as a command
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Interrupt Process (IP)
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>244
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Interrupts, suspends, aborts, or terminates the process
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>NOP
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>241
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>No operation
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>SB
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>250
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Subnegotiation of an option
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>SE
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>240
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>End of the subnegotiation
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Will
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>251
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Instructs the other end to begin performing or confirms that this end is now performing
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Won't
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>252
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Refuses to perform or rejects the other end performing</FONT>
</TABLE></CENTER><BR>
<P>Telnet commands are sent in a formal package called a <I>command,</I> as shown in Figure 6.5. Typically the commands contain two or three bytes: the Interpret as Command (IAC) instruction, the command code being sent, and any optional parameter to the command. The options supported by Telnet are shown in Table 6.2.
<BR>
<P><B><A HREF="06tyt05.gif" tppabs="http://www.mcp.com/817948800/0-672/0-672-30885-1/06tyt05.gif">Figure 6.5. The Telnet command structure.</A></B>
<BR>
<BR>
<P ALIGN=CENTER>
<CENTER>
<FONT COLOR="#000080"><B>Table 6.2. Supported Telnet option codes.</B></FONT></CENTER>
<BR>
<CENTER><TABLE BORDERCOLOR=#000040 BORDER=1 CELLSPACING=2 CELLPADDING=3 >
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P><B><I>Code</I></B>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P><B><I>Description</I></B>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>0
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Binary transmission
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>1
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Echo
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>2
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Reconnection
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>3
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Suppress Go Ahead (GA)
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>4
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Approximate message size negotiation
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>5
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Status
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>6
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Timing mark
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>7
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Remote controlled transmission and echo
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>8
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output line width
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>9
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output page length
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>10
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output carriage-return action
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>11
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output horizontal tab stop setting
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>12
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output horizontal tab stop action
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>13
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output form feed action
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>14
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output vertical tab stop setting
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>15
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output vertical tab stop action
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>16
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Output line feed action
<BR>
</FONT>
<TR>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>17
<BR>
</FONT>
<TD BGCOLOR=#80FFFF ><FONT COLOR=#000080>
<P>Extended ASCII characters
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