[ns] [HELP - URGENT] - UDP packet multiplexer

[Utente ns2]

Hello everybody,
sorry if I come again with the same question, but I am in fact stuck. 
Let's suppose we want to multiplex N small packets (each one with a certAin UDP header and its corresponding data) into a UDP bigger one. Is any agent of this kind already available in ns2? Any tip would be greatly appreciated. Thank you very much in advance for your help.
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