iptables - Routing and OpenVPN not running on the default gateway

I'm having difficult time setting the correct iptable in order to route OpenVPN traffic to my internal OpenVPN client.

My network is similar to this

                      +-------------------------+
           (public IP)|                         |   
{INTERNET}============{ eth1     Router         |
                      |                         |

                      |         eth2            |
                      +------------+------------+
                                   | (192.168.0.254)
                                   |
                                   |              +-----------------------+
                                   |              |                       |
                                   |              |        OpenVPN        |  eth0: 192.168.0.1/24
                                   +--------------{eth0    server         |  tun0: 10.8.0.1/24
                                   |              |                       |
                                   |              |           {tun0}      |

                                   |              +-----------------------+
                                   |
                          +--------+-----------+
                          |                    |
                          |  Other LAN clients |
                          |                    |
                          |   192.168.0.0/24   |
                          |   (internal net)   |
                          +--------------------+

So basically, I want to accept port and forward VPN traffic from router to internal OpenVPN box. Then I want the OpenVPN box take the traffic from eth port and sent it to tun.

Here is what I tried:

iptable on router:

$ iptables -A INPUT -i tun+ -j ACCEPT
$ iptables -A FORWARD -i tun+ -j ACCEPT

# Allow udp 1194 #
iptables -A INPUT -p udp --dport 1194 -j ACCEPT

# Allow traffic initiated from VPN to access LAN
iptables -I FORWARD -i tun0 -o eth2 \
-s 10.8.0.0/24 -d 192.168.0.0/24 \
-m conntrack --ctstate NEW -j ACCEPT

iptables -I FORWARD -m conntrack --ctstate RELATED,ESTABLISHED \
     -j ACCEPT

iptables -t nat -I POSTROUTING -o eth0 \
      -s 10.8.0.0/24 -j MASQUERADE

iptable on OpenVPN

Can anyone give me a pointer how I can fix this problem?