I want to set a firewall that filter all IP addresses expect the BOINC related ones.

Which addresses should be taken into account in the IP table rules?

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ANSWER

The IPs I accepted are

1) The World Community Grid IPs (198.20.8.246 and 198.20.8.241)

2) The BOINC IPs (174.125.95.103-74.125.95.147 and 209.85.225.99-209.85.225.147)

SCRIPT TO SET FIREWALL FOR WORLD COMMUNITY GRID ONLY (the script is available here
)

#!/bin/bash
echo -n "Iptables rules will be reset. Continue? (y/n) "
read a
if [ "a"=y ]
then
iptables -F
WORLD_COMMUNITY_GRID_IP[1]=198.20.8.246
WORLD_COMMUNITY_GRID_IP[2]=198.20.8.241

BOINC_IP_RANGE[1]="74.125.95.103-74.125.95.147"
BOINC_IP_RANGE[2]="209.85.225.99-209.85.225.147"


iptables -P INPUT DROP
iptables -P OUTPUT DROP

for i in "${WORLD_COMMUNITY_GRID_IP[@]}" 
do
       iptables -A INPUT -s $i -j ACCEPT
       iptables -A OUTPUT -d $i -j ACCEPT
done

    iptables -A INPUT -m iprange --src-range $i ACCEPT
for i in "${BOINC_IP_RANGE[@]}" 
do
    iptables -A INPUT -m iprange --src-range $i -j ACCEPT
    iptables -A OUTPUT -m iprange --src-range $i -j ACCEPT
done

echo "New iptables for running BOINC with only World Community Grid tasks
"

iptables -L INPUT -n -v --line-numbers
 iptables -L OUTPUT -n -v --line-numbers
fi
echo " "

echo -n "
Start firewall now? (y/n) "
read a
if [ $a=y ]
then
    service ufw start
fi