The packet transfer management node 10, wherein, in {HEAD ~ case} the binding information relating to said binding update message is not present in said mobile IP binding cache although the time information to indicate the latest time is said time information transmitted together with {TAIL ~ the identification information} of said binding update message, it is so arranged that said binding update message is to be re transmitted to said mobile terminal 
The packet transfer management node 10 , wherein , in { HEAD ~ case } the binding information relating to said binding update message is not present in said mobile IP binding cache although the time information to indicate the latest time is said time information transmitted together with { TAIL ~ the identification information } of said binding update message , it is so arranged that said binding update message is to be re transmitted to said mobile terminal
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