I have done vpn cluster pair with 2 nokia vpn. If i connect Vpn boxes to cisco 4507 switch arp reguests dont work (if i look from vpn:s arp table.) All vpn boxes and gateway router are same vlan in 4507 switch. If connect vpn:s to little 5 port d-link switch and dlink is connected to 4507 switch arp starts to work and cluster pair can see each other. Any idea what migt cause that.