@node Example
@section Example usage

Let's assume that there is some insecure link between your computer and
WiFi-reachable gateway.

@itemize
@item You have got @code{wlan0} NIC with 192.168.0/24 network on it.
@item You want to create virtual encrypted and authenticated 172.16.0/24
network and use it as a default transport.
@item Assume that outgoing GoVPN packets can be fragmented, so we do not
bother configuring MTU of TUN/TAP interfaces. For better performance just
lower it and check that no fragmentation of outgoing UDP packets occurs.
@end itemize

@strong{Install}. At first you must @ref{Installation, install} this
software: download, @ref{Integrity, check the signature}, compile.

@strong{Prepare the client}. Generate client's verifier for Alice as an
example:


@verbatim
client% ./utils/newclient.sh Alice
Passphrase:
Your client verifier is: $balloon$s=32768,t=16,p=2$bwR5VjeCYIQaa8SeaI3rqg

Place the following YAML configuration entry on the server's side:

    Alice:
        up: /path/to/up.sh
        iface: or TUN/TAP interface name
        verifier: $balloon$s=32768,t=16,p=2$bwR5VjeCYIQaa8SeaI3rqg$KCNIqfS4DGsBTtVytamAzcISgrlEWvNxan1UfBrFu10
@end verbatim

@strong{Prepare the server}. Add this entry to @file{peers.yaml}
configuration file:

@verbatim
Alice:
    iface: tap10
    verifier: $balloon$s=32768,t=16,p=2$bwR5VjeCYIQaa8SeaI3rqg$KCNIqfS4DGsBTtVytamAzcISgrlEWvNxan1UfBrFu10
@end verbatim

@strong{Prepare network on GNU/Linux IPv4 server}:

@verbatim
server% ip addr add 192.168.0.1/24 dev wlan0
server% ip tuntap add dev tap10 mode tap
server% ip addr add 172.16.0.1/24 dev tap10
server% ip link set up dev tap10
@end verbatim

@strong{Run server daemon itself}:

@verbatim
server% govpn-server -bind 192.168.0.1:1194
@end verbatim

@strong{Prepare network on GNU/Linux IPv4 client}:

@verbatim
client% ip addr add 192.168.0.2/24 dev wlan0
client% ip tuntap add dev tap10 mode tap
client% ip addr add 172.16.0.2/24 dev tap10
client% ip link set up dev tap10
client% ip route add 0/1 via 172.16.0.1
client% ip route add 128/1 via 172.16.0.1
@end verbatim

@strong{Run client daemon itself}:
@verbatim
client% govpn-client \
    -verifier '$balloon$s=32768,t=16,p=2$bwR5VjeCYIQaa8SeaI3rqg' \
    -iface tap10 \
    -remote 192.168.0.1:1194
@end verbatim

@strong{FreeBSD IPv6 similar client-server example}:

@verbatim
server% ifconfig em0 inet6 fe80::1/64
server% govpn-server -bind "fe80::1%em0"
@end verbatim

@verbatim
client% ifconfig me0 inet6 -ifdisabled auto_linklocal
client% ifconfig tap10
client% ifconfig tap10 inet6 fc00::2/96 up
client% route -6 add default fc00::1
client% govpn-client \
    -verifier '$balloon$s=32768,t=16,p=2$bwR5VjeCYIQaa8SeaI3rqg' \
    -iface tap10 \
    -remote "[fe80::1%me0]":1194
@end verbatim