No external network access from virtual machine

Hello:
I'm configuring a Windows Server 2012 Standard with Hyper-V and want to share a network card so that both the virtual machine and the host access a LAN using the same wire.
HOST SYSTEM:
OS: Windows Server 2012 Standard
IP: 192.168.50.1
VIRTUAL MACHINE: Windows XP
IP: 192.168.50.4
PHYSICAL SWITCH (CISCO):
IP: 192.168.50.6
I've configured an external virtual switch, assigned to it a physical card and activated the sharing between host and virtual machine.
With this configuration:
ping from HOST to VM and viceversa: OK
ping from HOST to REAL SWITCH: OK
ping from VM to REAL SWITCH: FAIL
If I configure the network card to work exclusively with the VM, it can access the external switch from the VM, but I lose any connection with the host.
I could solve the problem installing another physical card and using one for the host and one for the VM, but I can't get both working with the same card, even though they are in the same subnet, see each other, share files between VM and host... I'm not
trying to connect to the internet.
Any idea? Thanks.

Hello again,
Sorry for the delay.
After system update, the problem has not been solved. The external switches do not limit the number of MACs, so this is not the problem either.
After updating the system I deleted the virtual switch and created it again. I also rebooted the VM and even the server. It just doesn't share the access: only the VM or the server can access to the net at the same time, even if both see each other all the
time (server and VM).
Apart from that, every time I delete the virtual switch and create a new one, I reconfigure the VM as well (I delete the network card at the VM and create it again). When I do that I have to assign an IP address to the network card in the VM (no DHCP
installed, so this is normal), but I can use the same IP I was using before deleting the virtual switch. When I do so, a message appears saying the IP is used in a virtual network adapter, but this is hidden because it is not in use anymore. I haven't found
a way to see and delete these hidden network adapters either.
I think I'll install VMWare, because Hyper-V is more a problem than a solution.

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No external network access from virtual machine

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