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Added installation instructions.

*** gawk *** (GNU awk) is required for fw-universal.sh. Otherwise firewall doesn't work

On Debian / GNU Linux always install packages:

    apt-get install gawk perl iptables

and install package 'iproute' if you are using shaping:

    apt-get install iproute


Make checkout from CVS into /etc/firewall:

    cvs -d :pserver:anonymous@cvs.platon.sk:/home/cvs co firewall

and make some symlinks:

    cd /etc/init.d/
    ln -s /etc/firewall/fw-universal.sh firewall
    cd /etc/rcS.d/
    ln -s ../init.d/firewall S43firewall   # S40networking make network available on Debian, so I choose #43

Copy configuration example

    cp -p /etc/firewall/default-firewall.conf /etc/default/firewall

In case of problems comment out "ANTISPOOF_IFACE" in config file (e.g. you are on local network).

And now start you firewall with command

    /etc/init.d/firewall start