VMware has a bad habit of disabling a NIC if it does not appear to be in use at the Windows level.  The symptoms are the NIC is still visible to the host system and to Avanti, but no longer communicates on the network.  If this problem is encountered, enabling some Windows protocols on the NIC should fix it.  First try enabling the following protocols:

•QoS Packet Scheduler

•Link-Layer Topology Discovery Mapper I/O Driver

•Link-Layer Topology Discovery Responder

If that does not correct the problem, enable Internet Protocol Version 4 (TCP/IPv4) on the NIC and allow it to be assigned an IP on the Windows side.