Our example describes Microsoft Windows NT Telnet protocol client communication with a server using the True64 UNIX operating system. In Windows NT (or 2000), the toggle command is not available. For this reason, the debugging list cannot be used to analyze the Telnet protocol.
This should not discourage Windows users. We should recall that the MS Network Monitor program is available in Windows. MS Network Monitor helps in capturing the individual Telnet protocol packets as shown in the following figure:
Figure 12.3: A Telnet protocol packet includes IACs sent out by the server
Let us assume that the communication is started at the TCP level. Microsoft Client does not start the communication using the IAC Telnet protocol, not even at the default port, but waits to see whether the server uses Telnet protocol.
Table 12.5 shows an exhaustive listing of this communication. For example, the communication data shown in Figure 12.3 are broken down...