iptables rules to redirect all ports to a different machine (192.168.0.3), but port 22

redirect_to.sh

# ===============================================================================================================
# rules to redirect all ports to a different machine (192.168.0.3), but port 22
# ===============================================================================================================
redirect_to=192.168.0.3           
iptables -A FORWARD -i eth0 -o eth0 -p tcp --syn --dport 1:21 -m conntrack --ctstate NEW -j ACCEPT
iptables -A FORWARD -i eth0 -o eth0 -p udp       --dport 1:21 -m conntrack --ctstate NEW -j ACCEPT
iptables -A FORWARD -i eth0 -o eth0 -p tcp --syn --dport 23:65389 -m conntrack --ctstate NEW -j ACCEPT
iptables -A FORWARD -i eth0 -o eth0 -p udp       --dport 23:65389 -m conntrack --ctstate NEW -j ACCEPT
iptables -A FORWARD -i eth0 -o eth0 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -p tcp --syn --dport 1:21 -j DNAT --to-destination $redirect_to
iptables -t nat -A PREROUTING -p tcp --syn --dport 23:65389 -j DNAT --to-destination $redirect_to
iptables -t nat -A PREROUTING -p udp --dport 1:21 -j DNAT --to-destination $redirect_to
iptables -t nat -A PREROUTING -p udp --dport 23:65389 -j DNAT --to-destination $redirect_to
iptables -t nat -I POSTROUTING -j MASQUERADE