Port scan attack

Mandriva 2008.1, cable modem, 4 port Belkin wired router.

In the past couple of days my internet connection has slowed down, 
possibly by a factor of ten, and yesterday and this morning the system 
has been subject to a port scanning attack.  The system displayed a 
message indicating that it was mounted by my router and showed a button 
"Process attack".  That disappeared before I could react, replaced by a 
flashing warning triangle in the panel so I wondered if there was any 
way to reactivate the Process Attack option.  Does anybody know what it 
does?  Reverse DNS lookup maybe and an opportunity to blacklist the 
source somehow?

The attack has stopped but it would be handy to know what to do if it 
were repeated.

Len




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