Xen users - May 2008 - Limit broadcast and virtual interfaces

Hi all,
I''m experiencing some problems in setting up a network vith Xen VMs:
Xen
physical machine is in a LAN with another PC and I didn''t find out out
to
select the VM to which forwarding the packets (it seems that the broadcasted
Router advertisement is received by every VMs, even if they''re in a
different subnetwork).How should I set up the network if I want only a VM
(namely VH1) to receive the broadcasted packets from a PC in the LAN?

PC: other PC , VHi= i-th Xen VM

  VH2 ----VH1-----PC
                 |
                 |
                 |
              VH3

As far as I''ve understood, all the  VMs must be connected to the main
bridge
(xenbr1 in my case): isn''t this the reason whiy all the VMs receive
broadcast from the LAN?
I''d like also to know how to create and use a virtual interface for a
VM (if
possible, only for IPv6 traffic) and if it should be someway related to a
physical interface in the XEN dom0.
Thanks in advance


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