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    <p>you can use a tun/tap device, can simply read it from python, for example:</p> <p>tunnel.py</p> <pre><code>import os from fcntl import ioctl from select import select import struct import subprocess TUNSETIFF = 0x400454ca TUNMODE = 0x0001 tunFile = os.open("/dev/net/tun", os.O_RDWR) ifs = ioctl(f, TUNSETIFF, struct.pack("16sH", "tun%d", TUNMODE)) ifname = ifs[:16].strip("\x00") print "Allocated interface %s. Configure it and use it" % ifname subprocess.call("ifconfig %s 192.168.13.1" % ifname,shell=True) # Reading def read(): r = select([tunFile], [], [])[0][0] if r == tunFile: return os.read(tunFile, 1600) return None # Writing def write(buf): os.write(tunFile, buf) </code></pre> <p>the full example can be found <a href="http://www.secdev.org/projects/tuntap_udp/" rel="nofollow">here</a></p> <p>and route your packets to interface "tun0" or printed inetrface name.</p> <p>linux distributions does not require to install anything but if you are on windows use <a href="http://www.varsanofiev.com/inside/using_tuntap_under_windows.htm" rel="nofollow">this</a>, and for mac os use <a href="http://tuntaposx.sourceforge.net/" rel="nofollow">this</a></p> <p>EDIT 1 Note from <a href="http://backreference.org/2010/03/26/tuntap-interface-tutorial/" rel="nofollow">here</a>:</p> <blockquote> <p>The difference between a tap interface and a tun interface is that a tap interface outputs (and must be given) full ethernet frames, while a tun interface outputs (and must be given) raw IP packets (and no ethernet headers are added by the kernel). Whether an interface functions like a tun interface or like a tap interface is specified with a flag when the interface is created.</p> </blockquote> <p>for finding packet header information(like src, dst &amp; etc ...) you may use <a href="http://code.google.com/p/dpkt/" rel="nofollow">dpkt</a></p> <pre><code>from dpkt import ip from tunnel import read,write # tunnel.py while 1: data = read() if data: ipObj = ip.IP(data[4:]) print ipObj.src, ipObj.dst </code></pre>
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    1. POPython/iptables: Capturing all UDP packets and their original destination
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    1. COThis looks good. Is there a way to set `iptables` to make all UDP packets go to that tun device, without affecting TCP packets? Playing with `ip` routes alone probably wouldn't be able to tell the difference between TCP and UDP packets, which means I'd have to parse all TCP packets in Python, which would make things slower than they really have to do.
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    2. COyes , i must to edit this post
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    3. COi wrote a vpn server with tun and dpkt , and performance is so good, dpkt just uses ip header and do not parse the packet's body, you can route only UDP packets with ip tables, or determine udp packets by dpkt.IP object, i thing this is a regular way to process packets
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