I was able to create a VPN using and can ping and with the addition of PostUp and PostDown use it as a VPN for browsing but thats not the use case. I was excited to use the key-based security of the (wireguard) VPN as an authorization mean and decided to test it out. I have developed a windows forms app taking data from a MS SQL Server 2019 for Linux hosted on an Ubuntu 20.04 LTS server listening on port 1433 as the only port open so far with limited IPs allowed to access this port. Hello and Thank You for your excellent written tutorials.įirst I have to admit that I am new in setting up such network items outside LAN oder Intranet. See WireGuard home page for more information. In this guide, we have shown you how to enable IP forwarding and NAT rules using iptables in Linux for WireGuard VPN clients to provide internal clients with Internet access. # Find public IP address from command line on Linux dig TXT +short. Conclusion ↑ # We must get our WireGuard public IP address # See if you can access the Internet using the ping command, dig command/ host command and a ping -c 4 host # See if you can access WG based DNS server too (must be configured) dig -p 53 10.8.0.1 Test your configuration from the client side. # Your Ubuntu 20.04 LTS server's public IPv4/IPv6 address and port # # Otherwise client won't show server 's IP # Edit/Update old AllowedIPs entry as follows # Remote Ubuntu 20.04 wg0 server public key # We need to tell WireGuard commands and script snippets which will be executed by using the following two directives: # sysctl -w .forwarding=1 Step 7: Update wireguard config files for firewall and routing support ↑ # iptables -D INPUT -i eth0 -p udp -dport 51194 -j ACCEPT Step 6: Turn on IP forwarding on Linux ↑įor IPv4 we set the following Linux kernel variables to accept incoming network packets on wg0, passed on to another network interface such as eth0, and then forwards it accordingly:įor IPv6, try the following sysctl command: # iptables -D FORWARD -i wg0 -o eth0 -j ACCEPT # iptables -D FORWARD -i eth0 -o wg0 -j ACCEPT # iptables -t nat -D POSTROUTING -s 10.8.1.0/24 -o eth0 -j MASQUERADE We can reverse all command by deleting all added iptabes rules as follows: # iptables -I INPUT 1 -i eth0 -p udp -dport 51194 -j ACCEPT Step 5: Command to remove WireGuard iptables rules ↑ # iptables -I FORWARD 1 -i wg0 -o eth0 -j ACCEPT Step 4: Open WireGuard UDP port # 51194 ↑įinally, open UDP port # 51194 as follows: # iptables -I FORWARD 1 -i eth0 -o wg0 -j ACCEPT We must allow for packets being routed through the WireGuard server by setting up the FORWARD rule. The above rules allows for packets destined to wg0. # iptables -t nat -I POSTROUTING 1 -s -j ACCEPT Naturally, you must have WireGuard configured. Before we use any tools, we need to understand the exact iptables rules. For example, UFW is one such popular tool. Linux comes with raw iptables and easy to use frontend scripts. Procedure to set up WireGuard firewall rules
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