Openvpn settings

Hi everyone,

I made a few tests with the openvpn server from ASUS RT-N66u with RT-N66U_3.0.0.4_270.26b and the only way I can connect using the openvpn client is if the server is set to start on the port TCP 1194 and the interface type set to TUN.

The results I pulled out are as following:
1. Interface TUN + Port TCP 1194 = successfully connected to the openvpn server and is able to ping IPs from LAN
2. Interface TUN + Port UDP 1194 = openvpn client connects but can't ping in LAN
3. Interface TAP + Port TCP 1194 = OpenVPN server doesn't start
4. Interface TAP + Port UDP 1194 = The openvpn client hangs and fails to connect to the openvpn server

Does anyone happen to know if this is expected from the current OpenVPN version that is bundled with this firmware?

The rest of the openvpn server settings are as follows:
Server instance Srv1
State ON
Start with WAN Yes
Firewall Automatic
Authorization Mode TLS
Extra HMAC (tls-auth) Disabled
VPN Subnet 10.9.0.0/24
Pool interval 0
Push LAN to clients Yes
Direct clients to redirect Internet traffic No
Respond to DNS No
Encryption cipher AES-256-CBC
Compression Adaptive
TLS Renegociation Time -1
Manage Client-Specific Options No

Thank you!