On Mon, Jun 4, 2012 at 10:44 PM, Gordon Messmer yinyang@eburg.com wrote:
On a separate note however, I'd still like to know how to use a bridge to route packets between two networks.....say network card having address...192.168.1.3 and a kvm based virtual network say 172.31.1.0/24needing to use this device for Internet access (through router 192.168.1.1) using a bridge? How to do it?
If your networks are on different IPv4 broadcast domains (as you describe), you don't want a bridge.
If you want bridged networking with KVM, your guests will be on the same network as the host. They'll use your existing DHCP services and routing. They can be configured according to this document: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6-Beta/html/Virtu...
That configuration used to be reflected here: http://wiki.centos.org/HowTos/KVM ...but someone went and put in some really braindamaged instructions. That should be fixed or removed.
In case of a separate network, should it not be possible to create a dummy bridge or something and forward packets through maybe...NAT....A guy talks of this kind of thing here http://ghantoos.org/2007/10/24/kvmqemu-bridging-with-dummy-network-card/ but I don't quite understand it, because I am not familiar with /etc/network/interfaces.....seems to be ubuntu or some other linux.
I am using /etc/sys-config/network-scripts/ifcfg-xxx files. or any other forwarding system...but don't know how?
Any ideas of how to do it with separate IP addressing? The main network is out of my control and I cannot use its IP addresses.
Rgds. Sanjay.