Something

*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
#-A INPUT -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT --protocol tcp --dport 80 -j ACCEPT

## SSH ##
-A INPUT --protocol tcp --dport 22 -j ACCEPT

## FTP ##
-A INPUT --protocol tcp --dport 21 -j ACCEPT

## BitTorrent ##
-A INPUT --protocol tcp --dport 6881 -j ACCEPT
-A INPUT --protocol tcp --dport 6969 -j ACCEPT

for I in 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 \
    17 18 19 20 21 22 23 24 25 25 26 27 28 29 30
do
    -A INPUT --protocol tcp --dport "`expr 49125 + $I`" -j ACCEPT
done

-A INPUT --protocol tcp --dport 2710 -j ACCEPT
-A INPUT --protocol tcp --dport 4444 -j ACCEPT

COMMIT