Re: [Qemu-devel] Connecting vde and LAN

[Jim C. Brown]

On Mon, Jul 11, 2005 at 11:02:04AM -0400, Jim C. Brown wrote:
> > 
> > b) can't talk to the host itself. This is due to the packets going 
> > directly to the wire and never really "seen" by the host stack. Not sure 
> > yet if there is an easy way out, but I suppose it may be possible to set 
> > up a dummy tap with the same MAC and IP address as the base Ethernet 
> > device and duplicate broadcasts and packet directed to the host there, 
> > obviously assuming the administrator does not block this in firewalling..
> > 
> > Regards
> > Henrik
> > 
> 
> Alas, the accepted solution to allow pcap programs to talk to the host is to
> use tuntap to create a tap device and connect the program to the tap device
> instead of the real ethernet device.
> 

I tried using libnet 1.0 to send the packets, but that did not help. Also
tried libnet 1.1, that actually allowed the host to be pinged by the guest -
part of the time. It also caused pings on the same lan (from the guest) to fail
as well sometimes, so its not reliable enough to use.

I guess we should just do it the hard way - when grabbing packets that are
meant for the host, fake the request (fake a ping, manually do the socket call,
etc) and send the result back to the vde.

-- 
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.