When running multiple Avanti instances on a single host machine, it is recommended that a physical NIC be dedicated to each virtual NIC.  If multiple emulators share a single physical NIC performance degradation may occur.  Should multiple Avanti instances share a single host NIC, then manually assigning MAC address to each Avanti NIC is required, as described in Set MAC Address and Multiple Avanti Instances and MAC Addressing.  To avoid clashes of the assigned MAC addresses with those of other networking equipment or automatically generated virtual NIC MAC addresses, it is recommended that the assigned MAC addresses start with C6-00-00.

Note:The MAC address field will not accept an invalid MAC address.  Trying to type or cut and paste an invalid MAC address will result in nothing being entered in the MAC address box.