Computer Tips - Wireguard: Fedora server and Android client

Date: 2021feb26 Q. Wireguard: Fedora server and Android client A. This article in Fedora Magazine https://fedoramagazine.org/build-a-virtual-private-network-with-wireguard was my starting point. However I changed some things. Fedora Server Install
dnf install wireguard-tools
Make config folder
mkdir /etc/wireguard cd /etc/wireguard umask 077
Make keys
wg genkey | tee privatekey | wg pubkey > publickey
Make the server config file /etc/wireguard/wg0.conf
[Interface] Address = 192.168.2.1/24 PrivateKey = <SERVER-PRIVATE-KEY> # PostUp = Not necessary # PostDown = Not necessary ListenPort = 51820 [Peer] # My phone PublicKey = <PHONE-PUBLIC-KEY> AllowedIPs = 192.168.2.3/32
The 192.168.2.x range is for examples - changed it to something else Ensure you have forwarding enabled in /etc/sysctl.conf
net.ipv4.ip_forward=1 net.ipv6.conf.all.forwarding=1
If you needed to change that file do:
sysctl -p
I made a file called /etc/firewalld/services/mywireguard.conf
<?xml version="1.0" encoding="utf-8"?> <service> <short>Wireguard VPN</short> <description>Wireguard VPN</description> <port protocol="udp" port="51820"/> </service>
And added a reference to /etc/firewalld/zones/FedoraServer.xml
<?xml version="1.0" encoding="utf-8"?> <zone target="default"> <short>Public</short> ... <service name="mywireguard"/> <masquerade/> </zone>
Then reload
firewall-cmd --reload
Now we can start the server
systemctl start wg-quick@wg0
Android client Here is how I setup a client on Android The interface This assigns the Android phone as address 192.168.2.3 It tells it to use the DNS server at 192.168.2.53 which is the DNS server on my LAN. The peer (ie the server) The entry in Allowed IPs says we want Wireguard for all IP-addresses If you're on a paid link you may want to turn off the keep alive. Testing Use termux on Android to
ping google.com
On the Fedora side
wg
Will show
interface: wg0 public key: <PUBLIC-KEY> private key: (hidden) listening port: 51000 peer: <PUBLIC-KEY> endpoint: <IP-ADDRESS>:41984 allowed ips: 192.168.2.3/32 latest handshake: 39 seconds ago transfer: 4.62 MiB received, 71.96 MiB sent
So you can see if its handshaked and how much has been transferred Dump all Wireguard traffic
tcpdump -n -v -i wg0