[Libvir] Patch for routed virtual networks

Soren Hansen soren at ubuntu.com
Sun Mar 30 18:58:42 UTC 2008

On Fri, Mar 28, 2008 at 08:40:19PM +0000, Daniel P. Berrange wrote:
> In theory I think it might be possible to avoid the need to configure
> the local LAN router, by messing with proxy_arp, but I've not got it
> to work so far. 

Unless I've misunderstood something, this won't work. If a machine on
the LAN tries to reach one of the virtual machines (which is on a
different subnet) it won't send out an ARP request for the IP in
question, but just stick the MAC address of the the gateway onto the
packet and let the gateway deal with it. AIUI proxy ARP is for when you
have a subnet that's physically separated in which case the bridge will
need to proxy the arp requests for hosts on the one side to hosts on the
other side (and vice versa, obviously).

Soren Hansen               | 
Virtualisation specialist  | Ubuntu Server Team
Canonical Ltd.             | http://www.ubuntu.com/
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