Patent ID: 7978681
Filing Date: 2011-07-12
Classification: H04L

Abstract:
1. A network apparatus for discovering a path maximum transmission unit (MTU) in a data communication network, comprising: a MTU-comparer detecting a path MTU recorded on a predetermined packet transferred over a routing path between a source node and a destination node and comparing the detected path MTU with an internal MTU stored in the MTU-comparer; and an event-processor updating the path MTU recorded on the predetermined packet to contain the internal MTU if the detected path MTU is larger than the internal MTU, wherein an extension header of the predetermined packet with the path MTU recorded thereon comprises: wherein the predetermined packet comprises at least one of a data packet and a binding update message packet, wherein the routing path between the source node and the destination node comprises at least one intermediate node, one intermediate node which has received the predetermined packet updates the path MTU in the received predetermined packet if the path MTU in the received predetermined packet is larger than the internal MTU on the one intermediate node and forwards the received predetermined packet to next intermediate node or the destination node.