openVswitch won't get to a virtual IP

[lejeczek]

Hi guys.

Among all the mailing lists I'm subscriber of this one I 
thought, would where chances to find 
'openvswitch'+'libvirtd' experts to share thoughts & 
suggestions should be grater.

A case:
a) all guests are KVM.
b) I have NM managed OVS bridge and libvirtd network to/on 
that bridge
c) "regular" NM bridge and network off it in libvirt

problem is - guests on OVS network can _not_ ping a virtual 
IP of a guest(s) on 'regular' bridge network, but..  can 
ping "actual" IP of that same guest(s) okey.

any thoughts and ideas on how & what to investigate are very 
appreciated.
many thanks, L.