I am having a problem with configuring the bridge to work as a hub. My setup is the following:
I have a RHEL host server on which I am running KVM. I have a Linux guest that I am running on this. A physical interface of the host is on the same bridge as the guest's interface. The bridge inherits the mac address of the physical interface on running the steps as mentioned in this link http://wiki.libvirt.org/page/Networking#Fedora.2FRHEL_Bridging . Also the static IP address that was being originally provided to the physical interface, is now given to the bridge to enable networking for the host.
What I am trying to do is have a copy of all the traffic coming in on the physical interface be given to the VM. To configure the bridge as a hub, I set the ageing time value on the bridge to 0 as mentioned in a previous post on this list (http://www.mail-archive.com/bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx/msg01940.html). The problem I am facing is that on the VM, I only see the traffic(using tcpdump) leaving the physical interface. I do not see the traffic that is coming in to the physical interface. The bridge assumes(I am guessing as it inherits the mac address of the physical interface), that the incoming traffic is meant for itself and hence does not forward on the traffic.
In case a second guest is introduced in the above scenario(with an interface on the same bridge), then with the above configuration for ageing time, all the traffic going to one guest is seen by the second guest. So, the bridge does work as a hub for all other scenarios.
Could someone suggest if there is a way to work around this problem?
Thanks
varun
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