Virtual packet
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A virtual packet is a tool used to overcome the problem of trying to send data between two heterogeneous networks. If a router connecting networks A and B receives a frame constructed from network A, using protocol PA as its data exchange protocol, it won't mean ANYTHING for addressing use on network B, which we will assume uses PB as its data exchange protocol. To fix this, hardware-independent packet formats (or virtual packets) were created to overcome the heterogeneity.