I have a tun which I use to forward packets to some other nodes there is not a tunnel among them. If you don’t connect any program to the tun interface to catch outgoing traffic, packets will be lost. July 19, at Still there are some points I’m not fully understanding please forgive my ignorance ;. For iptables, a good reference though a bit outdated is https: February 5, at This is great info!

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OpenVPN – Debian Wiki

The problem I have is that once I exit this program that created the tap device ctrl-c or killI cannot ever get it to run again successfully without rebooting. Sign up or log in Sign up using Google.

April 22, at At this point, you will probably want to enable masquerading to get the tap network access to the local network or internet. If you want to have the tap interfaces automatically numbered, use the script on the VirtualBox page. This answer is probably a bit late, but I ran into the problem, exactly as described, myself. Here is the code: Original patch went in without proper review and ACK.

I think there are some libraries floating around to access POSIX syscalls from Java never tried myself, so I can’t really speak ; for example this http: In the case of tap device, the “ethernet controller” is virtual and you don’t have to do anything in your application, since the kernel already hands over complete frames and expects complete frames from your application.


Is it possible somehow? If you think about it, it’s exactly what would happen if you pinged another interface’s IP address for example eth0: After all, hardware switches don’t have MAC addresses.

The virtual interfaces are created, made persistent, assigned to an user, and configured by root for example, by initscripts at boot time, using tunctl or equivalent The regular users can then attach and detach as many times as they wish from virtual interfaces that they own. What OS debain you like to see more articles about? I dump the packet buffer to a txt file and expect to at least see a length field at the specified place.

And when you add a new device, you don’t expect it to exist.

Of course, then you’ll have to manage contention yourself. There are a few ways, the easiest is probably to just bridge the physical eth0 and the QEMU guest interface together into eg br0 and give br0 a public IP or make it reachable run/tap the outside somehow.

Your tutorial helped me code it up. According to the ruleset http: You may also test with ping. First locate the module with this command: The term “vbox” will tum/tap used to refer to a virtualbox machine. Nut, when I create tap0 and tap1, then create bridge br0 and br1.


But for my package wrote into tun0, it’s different.

Debian Lenny Tun/Tap Bridge Setup

It’s not just Linux bridge, i also used OVS, still the same. I guess I just need to contact the packet maintainer instead of ranting in the comment section of 3 year old blog posts. All packets from Now you write it unchanged to tap2 which has a different MAC from tap1. I usually install these packages to most of my machines: The architecture is similar to the one described in https: This means it has an open socket of some kind, to which it sends data. Whether an interface functions like a tun interface or like a tap interface is specified with a flag when the interface is created.

In this case, Blog is very informative, I have scenario here, where in I am developing L2 control plane for distributed data plane for a switch, The control plane would be running Linux on control cards and remaining all the cards have fast path L2 data plane.

Through iptable tracing, the route in tun0 for the incoming traffic from outside or itself looks different.

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