How to monitor ethernet connection and portscans?

Just installed openSUSE 10.2 and what a relief. All my hardware was
recognized and the configuring and tweaking has begun. However I still use
windows for some specific programs, but find myself spending more time
with SUSE. Of course it takes some time to find your way around, but that
is the case with every new OS, so I think it's part of the learning proces.

As I get used to the OS, the questions on how to get specific things done
will pop up from time to time. What I would like to know now is:
- How to visibly monitor my ethernet connection and turn it off or on
instantly?
- How to monitor portscans actively? This is a windows habit and probably
not necessary in a Linux environment?

Thanks in advance for any advice or suggestions.

Jan

--
openSUSE 10.2 (i586)
KDE 3.5.5 "release 45.4"
AMD Athlon 1.150 MHz + 1.024MB RAM
.

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