que regra devo acrescentar no meu firewall para eu ter acesso remoto ssh no meu speedy home

#!/bin/sh

IPTABLES=/usr/sbin/iptables
DEPMOD=/sbin/depmod
INSMOD=/sbin/insmod

EXTIF="ppp0"
INTIF="eth1"

$INSMOD ip_tables
$INSMOD ip_conntrack
$INSMOD ip_conntrack_ftp
$INSMOD ip_conntrack_irc
$INSMOD iptable_nat
$INSMOD ip_nat_ftp

echo "1" > /proc/sys/net/ipv4/ip_forward
echo "1" > /proc/sys/net/ipv4/ip_dynaddr

$IPTABLES -F
$IPTABLES -t nat -F
$IPTABLES -t mangle -F
$IPTABLES -X

$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -m state --state ESTABLISHED,RELATED
-j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -j LOG
$IPTABLES -t nat -A POSTROUTING -p tcp -o $EXTIF -j MASQUERADE


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