Changing openvpn dhcp pool

OK finally it is solved with some changes on the config file:

port 1194
proto udp
dev tun

ca /etc/openvpn/ca.crt
cert /etc/openvpn/server.crt
key /etc/openvpn/server.key
dh /etc/openvpn/dh2048.pem

mode server
tls-server
topology subnet
push "topology subnet"
ifconfig 10.8.0.1 255.255.254.0
ifconfig-pool 10.8.1.0 10.8.1.253
route-gateway 10.8.0.1
push "route-gateway 10.8.0.1"

client-config-dir /etc/openvpn/ccd

push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"

client-to-client

keepalive 10 300
comp-lzo

user nobody
group nobody
persist-key
persist-tun

status /etc/openvpn/openvpn-status.log
verb 6