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IPTables
Forward port to another host
SNAT and DNAT
IPLOCAL=a.b.c.d
IPREMOTE=x.y.z.w
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp --dport 33307 -j DNAT --to-destination ${IPREMOTE}:3306
iptables -t nat -A POSTROUTING -p tcp -d ${IPREMOTE} --dport 3306 -j SNAT --to-source ${IPLOCAL}