| 摘要 |
The present invention discloses a technique, by which it is possible to quickly decide a PMTU relating to a new data path after a handover even when a mobile node has performed the handover. According to this technique, a mobile node (MN) 10 for performing handover notifies an IP address of a correspondent node (CN) 40 performing communication before the handover to an access router newly connected (nAR) 30 after the handover. When nAR discovers and decides an optimal PMTU relating to a path to CN, and notifies the decided PMTU to MN when MN is connected under the control of nAR. As a result, MN sets up a PMTU relating to the data path to CN immediately after the handover and can transmit packet in optimal packet size. In particular, it is possible to notify the IP address of CN, with which MN has been communicating before the handover, to nAR by using the processing relating to FMIP.
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