@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 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 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