Mine

dev tun
proto udp

server 10.12.0.0 255.255.255.0

dh keys/dh1024.pem
ca keys/ca.crt
cert keys/vpn-server.crt
key keys/vpn-server.key

client-config-dir ccd
client-to-client
ifconfig-pool-persist ipp.txt

#port 1194

comp-lzo
ping 15
log /var/log/openvpn0.log
verb 3

cipher AES-256-CBC
auth MD5


#fragment 500
#mssfix
#  tun-mtu 1500
#  tun-mtu-extra 32
#  mssfix 1450
#  key-method 2