Any unix commands to view network status & activity using the terminal?

I don't use the terminal much and was wondering if there are any unix network commands that let you view packet contents, connection status and other network information. I'm not interested in making any changes, I just want to use the terminal to get network and related information.
Thanks in advance to anybody who answers.
- Mark
G4/450MHz Sawtooth Mac OS X (10.4.7)

Hi Mark,
   There are tons of commands; it would help to know what you want to know. You can monitor the status of all ports with:
sudo lsof +Mi
That will display all network connections and all listening daemons. A command that is similar to that is:
netstat -a -f inet
Of course netstat specializes in network information and there are lots of different stats it will display.
   If you run a firewall, it keeps stats on rule matches. You can see them with:
sudo ipfw -atdN list
   As has already been mentioned, Mac OS X comes with tcpdump but there's only one great packet sniffer: Ethereal. It doesn't come with OS X but if you have X11, it can be installed with a packet manager like Fink.
   Finally, many running services keep their own stats or logs. You would have to read up on the ones you're running to see what information they provide.
Gary
~~~~
   A diplomat is man who always remembers a woman's
   birthday but never her age.
         -- Robert Frost

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Any unix commands to view network status & activity using the terminal?

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