Wireshark · Wireshark-users: Re: [Wireshark-users] Understand wireshark data

[Guy Harris <guy@xxxxxxxxxxxx>]

On Aug 19, 2009, at 8:09 AM, deostroll@xxxxxxxxx wrote:

> Hi. Okay I have captured data with wireshark. I am trying to  
> understand telnet commands to send to my telnet server. (You know  
> things like IAC, DO, WILL WONT, etc).
>
> For one packet, in the packet details window under the node "Telnet"  
> node I saw something written like:
>
> Command: Will Terminal Type
> Command: Will Negotiate About Window Size
>
> Does this translate to
>
> IAC WILL [Terminal Type] IAC WILL SB [Window size]

Yes.

One could argue that, underneath the "Command: XXX" entries, there  
should be subitems for the IAC byte, the command byte, and the  
arguments to the command.

> Is it one sequence of instruction or two instructions?


It's two commands, in the sense that there are two Interpret As  
Command bytes.  It's also a sequence of bytes containing those two  
commands.