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Do you need an iptables rule for OpenVPN?
You do need a iptables rule for the VPN clients to access the network. These rules are an extract of openvpn-tools, presented in Install and setup OpenVPN on Debian, a OpenVPN management script and how-to i’ve written. Make sure also to have a DNS server accessible from your VPN clients. A simple answer is OpenDNS (8.8.8.8).
Can a client connect to a LAN using iptables?
The whole task is solely a matter of correct routing, not NAT-ing. In order for clients to be able to connect to the LAN ( 10.20.0.0/24 ), you must add this subnet to the AllowedIPs directive inside your server config to be allowed. This however automatically sets-up a new route for the respective subnet, overriding the original route.
How to install iptables persistent in Ubuntu Debian?
Create this script eg sudo nano iptables.sh where eth0 is the interface your server is running on. Could be br0 if using VMs. Now test it! If it didn’t work reboot. If it did work save the configuration with iptables-persistent. Debian/Ubuntu: sudo apt install iptables-persistent.
Which is the best router to use for OpenVPN?
In your situation you should try to use standard routing instead of using NAT (between the internal network and the openvpn network). NAT should be your last option. The “edge router” (probably your CPE) (bewteen your internal network and the rest of internet) needs to send the packets for the VPN nodes (in 192.168.3.0/24) to the Open server.
What does it mean to forward ports through iptables?
Port forwarding is the process of forwarding requests for a specific port to another host, network, or port. As this process modifies the destination of the packet in-flight, it is considered a type of NAT operation. In this guide, we’ll demonstrate how to use iptables to forward ports to hosts behind a firewall by using NAT techniques.
How does OpenVPN forward traffic to VPN tunnel?
The part of the puzzle that’s missing is the routing. If the tunnel is up you want “all” outgoing traffic to use it. Otherwise use the normal route. This is handled within OpenVPN using the redirect-gateway def1 parameter in your client configuration.
How does OpenVPN redirect traffic through a router?
OpenVPN has a redirect-gateway option that directs all network traffic through the tunnel; it replaces the existing default route (that usually points to your local wireless router) with a new default route to the VPN endpoint.