using TCPDump

["Antonio I." <cocoadeveloper () netscape net>]

Hi, I am having trouble getting tcpdump to work for my machine. I have 
tried some of the examples given in the man page but came up empty. 
Everytime I try to do a tcpdump on anything I get this message:
"tcpdump: no suitable device found"
This is the first time I have worked with tcpdump so I do not know if 
there is a need to configure anything before hand. What I am trying to 
achieve is simply read TCP packets going into a server. Looking at one 
of the man page examples, one reads:
"To print all packets arriving at or  departing  from  sun-down:
             tcpdump host sundown "

I try this: tcpdump host 192.168.2.8, my LAN IP. I get the same error 
message as above. Is this the right way to do it? If so why am I getting 
the "no suitable device found" message, and what does that mean?

Is this normal behaviour for a first-run of tcpdump? This program came 
with my darwin dist so I wouldn't be surprised if it was badly compiled. 
I appreciate your time very much. Thank You.
Tony

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