먼저 저의 /etc/rc.d/rc.local 파일 내용입니다.
맨 마지막 줄에 다음을 추가 했습니다..
 echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -A POSTROUTING -t nat -o eth0 -j MASQUERADE
iptables -A PREROUTING -t nat -p udp --dport 9068 -j DNAT --to 192.168.1.6:9068
iptables -A PREROUTING -t nat -p udp --dport 9067 -j DNAT --to 192.168.1.6:9067
iptables -A PREROUTING -t nat -p udp --dport 9066 -j DNAT --to 192.168.1.6:9066
iptables -A PREROUTING -t nat -p udp --dport 9065 -j DNAT --to 192.168.1.6:9065
iptables -A PREROUTING -t nat -p tcp --dport 51210 -j DNAT --to 192.168.1.6:51210
iptables -A PREROUTING -t nat -p udp --dport 51200 -j DNAT --to 192.168.1.6:51200
iptables -A PREROUTING -t nat -p udp --dport 51201 -j DNAT --to 192.168.1.6:51201
iptables -A PREROUTING -t nat -p tcp --dport 51210 -j DNAT --to 192.168.1.3:51210
iptables -A PREROUTING -t nat -p udp --dport 51200 -j DNAT --to 192.168.1.3:51200
iptables -A PREROUTING -t nat -p udp --dport 51201 -j DNAT --to 192.168.1.3:51201
  잘못된 내용이나 추가 사항이 있으시면 댓글 달아주세여~~~
  농사꾼.