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Because these packets are no longer sent to the router, the MLS-SE must perform the rewrite
function. When the switch changes the source and destination MAC addresses, the MLS-SE uses
the MAC address of the MLS-RP for the source, and it changes the destination MAC to the
MAC of the directly connected host. Through this procedure, the frame appears to the destination
host as if it had come through the router. Figure 18.6 depicts the differences between the
incoming frame and the exiting frame.