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Microsoft NLB | not able to access the vip from different n/w

Im facing a problem with Microsoft Network Load Balancing, i got two network one user network and server network and Microsoft NLB is configured for Server network but i could not access the virtual ip address of the server from user network but i can ping the real ip of the servers, were as i can access it from the same network both virtual and real.

similar issue i found it on Nortel 8600 and they told me to enable per VLAN Unicast Flooding and the command was

# config vlan 1 ip nlb-unicast-mode enable

can anyone help me out to sort out this issue. Im using 3750 switch and 6500 with FWSM module.