client conf (Linux) : 

client
dev tap
proto udp
remote remote_ip 1194
nobind
user nobody
group nobody
persist-key
persist-tun
#pull
ns-cert-type server
tls-auth /etc/openvpn/keys/ta.key 1
ca /etc/openvpn/keys/ca.crt
cert /etc/openvpn/keys/VPN-Client.crt
key /etc/openvpn/keys/VPN-Client.key
comp-lzo
verb 4
cipher BF-CBC


server conf : 

port 1194 ## default openvpn port
proto udp
#dev tap
dev tap0
#server 192.168.10.0 255.255.255.0
server-bridge 192.168.1.91 255.255.255.0 192.168.1.128 192.168.1.130
ca /etc/openvpn/keys/ca.crt
cert /etc/openvpn/keys/VPN-Server.crt
key /etc/openvpn/keys/VPN-Server.key
dh /etc/openvpn/keys/dh1024.pem
tls-auth /etc/openvpn/keys/ta.key 0

#cipher BF-CBC        # Blowfish (default)
#push "shaper 100000"
push "route 0.0.0.0 255.255.255.255 net_gateway"
#client-to-client
persist-key
persist-tun
keepalive 10 60
#fragment 1300
#mssfix 1400
comp-lzo