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When a network connection is opened between computers they must agree on an MTU size, which will be the smaller of the two default values. If the computers were directly connected, this wouldn't be a problem. Between you and the computer your accessing, are routers, which act as intersections of the information superhighway. These routers have an MTU as well. When a packet larger than the MTU of the router is received, it is fragmented into smaller packets which it can handle.