/etc/openvpn/555-client.conf:
client
dev-type tap
dev ovpn-555-wlan
proto udp
remote 192.168.255.1
resolv-retry infinite
nobind
persist-key
persist-tun
mute-replay-warnings
ifconfig 192.168.0.13 255.255.255.0
route-gateway 192.168.0.1
route 0.0.0.0 128.0.0.0
route 128.0.0.0 128.0.0.0
ca 555/ca.crt
cert 555/hp.crt
key 555/hp.key
ns-cert-type server
cipher AES-128-CBC
comp-lzo
verb 3

/etc/openvpn/555/up.sh:
#!/bin/sh
ip a f dev $1
ip a a 192.168.0.13/24 dev $1
#ip a a 3ffe:400:a60:f268::f00:f00:f00/64 dev $1
ip l s $1 mtu $2 up