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What is tun0 network?
The tun0 is the VPN interface. It’s a virtual interface. You can put iptables rules on it if you wanted to. It’s an interface. User space in Linux is separate from kernel space.
What is TUN interface Linux?
Tun/tap interfaces are a feature offered by Linux (and probably by other UNIX-like operating systems) that can do userspace networking, that is, allow userspace programs to see raw network traffic (at the ethernet or IP level) and do whatever they like with it.
What is a tunnel device?
Device tunnel connects to specified VPN servers before users log on to the device. Pre-login connectivity scenarios and device management purposes use device tunnel. User tunnel connects only after a user logs on to the device. User tunnel allows users to access organization resources through VPN servers.
How does a TUN interface work?
TUN, namely network TUNnel, simulates a network layer device and operates in layer 3 carrying IP packets. TAP, namely network TAP, simulates a link layer device and operates in layer 2 carrying Ethernet frames. TUN is used with routing. TAP can be used to create a user space network bridge.
What is tunneling DBD?
“Tunneling” is mostly defined as ‘hooking a survivor on consecutive hooks while ignoring all other survivors’.
How to route all DNS traffic through OpenVPN?
This command assumes that the VPN subnet is 10.8.0.0/24 (taken from the server directive in the OpenVPN server configuration) and that the local ethernet interface is eth0. When redirect-gateway is used, OpenVPN clients will route DNS queries through the VPN, and the VPN server will need handle them.
How to tunnel traffic from eth0 to tun0?
Looking at your client routing table, it seems the OpenVPN client have correctly set up routes, so that the VPN server is your default gateway now (this is instructed by redirect-gateway def1 in server config): So you have basically achieved what you want – letting all traffic that originally goes through eth0 goes to tun0 now.
How to Nat VPN traffic to the server?
The server will need to be configured to deal with this traffic somehow, such as by NATing it to the internet, or routing it through the server site’s HTTP proxy. On Linux, you could use a command such as this to NAT the VPN client traffic to the internet:
What should I do if OpenVPN goes down?
If OpenVPN goes down or # is restarted, reconnecting clients can be assigned # the same virtual IP address from the pool that was # previously assigned. ifconfig-pool-persist ipp.txt # Configure server mode for ethernet bridging. # You must first use your OS’s bridging capability # to bridge the TAP interface with the ethernet # NIC interface.