help with second network device

Hello people, I need to assing a network device to a VM, but only I can to assing the same network device (eth0) to all VM,s and work, I can working with other eth.

Data
Proxmox 2.1.14,
usr/bin/kvm -version
QEMU emulator version 1.1.1 (qemu-kvm-devel), Copyright (c) 2003-2008 Fabrice Bellard

regards

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