[ns] Simulate DTN

[ns user]

Hi all , 

I want to simulate DTN (Delay Tolerant Network) and I don't know witch Simulator is the best for this. 
I tried to do this under NS2 , bus the single patch I found works on ns 2.27 and the syntaxe used is not supported by gcc 4.2. (Note that I have use Ubuntu 8.04 and gcc 4.2)

Any one has solution for my problem ?!!!! :(

Thanks in advance 
Best regards 

Asma