Network doesn't work after creating Virtual network

Network doesn't work after creating Virtual network

I just installed Windows 2008 R2 with Hyper-V enabled. If I don't create Virtual network, both NICs connecting to LAN and SAN work fine. If I create virtual network for both LAN and SAN, virtual LAN work fine but not SAN virtual network. The SAN virtual network can't access the SAN and other computer in the SAN can't ping the server SAN IP. If I disable the SAN virtual network, the server can access the SAN. Why?

Here are configuration:

1. Cisco switch port is configured to use dot1q.
2. On the Hyper-V server, I enabled 2 NICs, one for LAN (LAN1-NTDOMAIN and VLAN ID is 1) and another for SAN LAN3-SAN and VLAN ID is 800). Both NICs work fine on the Hyper-V server.

3. In the Hyper-V Virtual Network Manager, I added one Virtual Network called New Virtual Network. Question: should I check "Enable virtual LAN identification for management operating system"?

4. In the VM Settings, "Enable virtual LAN identification" of the LAN virtual network is checked and VLAN ID is 1. "Enable virtual LAN identification" of the SAN virtual network is checked and VLAN ID is 800.

In the VM, VLAN 800/SAN works fine but not VLAN1/LAN.

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