3.8 Firewall questions

[Maud_Dib]

I'm running knoppix 3.8 on two PCs , one is installed and the other is Live w/ USB home.
Is there a firewall program included in 3.8 ?
if yes , where is it and how do i set it up ?

if No , where can I get One ?

I want to block certain isp addresses on the internet

Thanks
Larry