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Re: [Qemu-devel] Connecting vde and LAN

From: Oliver Gerlich
Subject: Re: [Qemu-devel] Connecting vde and LAN
Date: Sun, 10 Jul 2005 20:23:17 +0200
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Jim C. Brown schrieb:
> On Sun, Jul 10, 2005 at 06:42:30PM +0200, Henrik Nordstrom wrote:
>>On Sun, 10 Jul 2005, Oliver Gerlich wrote:
>>>what is the best solution to connect the vde "switch" to my real LAN so
>>>that Qemu guests get IPs from my LAN-wide DHCP server?
>>bridgeing of your ethernet interface and the TAP interface connecting to 
>>vde is undoubtly the best if you want to provide full access to the LAN.
>>>Also I tried to set up IP forwarding between tap0 and eth0, but then the
>>>Qemu guests aren't transparently on my LAN (and don't get the correct
>>>config from the DHCP server).
> The best solution is to use a vde_switch with libpcap and libnet. This allows
> intercepting packets meant for the guests (via libnet) and forwarding them 
> thru
> vde. libpcap allows for packets in vde to be passed on to the lan. This also
> allows for a sort of seamless bridging between host and guest lan. 
> (Technically
> a tap device is still required to be able to talk to the host, but my 
> understanding
> is that libpcap handles this automatically.) Plus, the nic remains eth0.
> I am not sure how libpcap and libnet would work with DHCP or ARP, but since
> they work on the ethernet level I suppose a single dhcpd server on eth0 would
> work in this case, but I am not 100% sure.

Sounds interesting! How do I set this up? Couldn't find anything on
Google, and personally I have no idea how to do this :)

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