problem with ng_device as tun replacement

[Tomas Svensson]

Hi,

I am trying to replace the tun interface using netgraph by linking 
ng_device and ng_iface:

ngctl mkpeer iface dummy inet
ngctl mkpeer ng0: device inet inet

then I try to use it as a drop-in replacement for tun, but it doesn't 
really work:

1. If I send an IP packet through /dev/ngd0 (after doing a normal 
open()), the packet doesn't get sent until I write a second packet to 
the device.

2. If i route packets to ng0: it works even worse, with very long and 
strange delays.

I can do the same with tun and it works fine. I also tried using the 
netgraph user library to open a socket, and this works too (but I can't 
use it since the performance is very poor). 

Any ideas?

-Tomas