[Vtun-devel] How to setup tun0 using tun/tap

[Mike H. <mik...@ya...>]

I am new to tun/tap programming.
  Start to setup an interface tun0,
  and test whether able to receive packet from normal client program.
  
  Firstly I adopted the tun related code from vtun.
  Then call tun_open and ifconfig to turn tun0 on,
  and repeatly tun_read() from tun0 in a loop.
  On the other hand, I start a UDP client program to send UDP packet to tun0.
  
  I expected I could read the whole UDP packet including header,
  and print it out char by char.
  However, nothing is printed.
  
  Where is my mistake?
  Hope to get help, thank you.
  
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