For users connecting via PPPoE (Point-to-Point Protocol over Ethernet), ensuring the correct MTU (Maximum Transmission Unit) setting on their router is crucial for maintaining optimal network performance and internet access. Understanding MTU # MTU, which stands for Maximum Transmission Unit, is a concept related to Layer 2 networking. Its purpose is to limit the size of data (payload) within a MAC frame. Think of data packets like goods being transported by trucks. If the goods are too large, the truck cannot transport them efficiently. Conversely, if the packaging is too light or insufficient, transportation efficiency suffers. MTU is akin to the maximum load capacity of the truck.