I have one, who's network are you pentesting?
As balding parrot said, if it's your network then you control the client association process...so I don't understand how your capture file has got to 89Mb.
No offence but there seems to be a lot of people here who are "pentesting" networks who don't seem to be that well versed in wireless pentesting...so I guess what I'm really saying is how do you all get these jobs because I can't find anyone to pay me to pentest their network, (not that I'd actually feel qualified to!)?
Don't take that the wrong way, I'm not accusing anyone of wrong doing...just interested in making some spare cash