Questions about responding to Pings

[Siri Amrit Kaur]

I'd like to learn about Pings. I did a port scan test and all my ports are in 
stealth mode, but my system responded to pings and the test results said that 
was a security risk. If that's true, how do I make it not respond to pings? 
Is there a SIMPLE way to do this? I'm scared to go mucking about in iptables.

A little info on my setup: 
I'm using PCLOS (based on Mandrake) and the Shorewall firewall, on a 
standalone box with a DSL modem/router. I'm not running any servers. I have 
the software firewall in the modem turned off because it was screwing some 
things up. 

Thanks,

Siri Amrit
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