Possible to find ip addresses of everyone in an ad hoc network?

Hi,
I am developing an application which involves roaming laptops. I need to know when a laptop comes into range so that I may begin communicating with it. Specifically, what I need is to find out the IP address of the computer.
I have put a lot of thought into this, and think there are two possible ways to do this (BTW I am running linux):
1) Using some (unknown to me right now) command line utility that I can call from Java, and parse the output of the program for any ip addresses in the current ad hoc network. So far I have looked at iwconfig and iwlist, but have not found anything useful.
or
2) Somehow flood the ad hoc network so that every computer becomes aware that my PC is now in range, and can send a signal back to complete the handshake.
Anyway, hope you guys can lend me some insight into this problem.

>
1) Using some (unknown to me right now) command line utility that I can call from Java, and parse the output of the program for any ip addresses in the current ad hoc network. So far I have looked at iwconfig and iwlist, but have not found anything useful.There is no such command in Java.
jellystones wrote:
2) Somehow flood the ad hoc network so that every computer becomes aware that my PC is now in range, and can send a signal back to complete the handshake.You could, in theory, flood the network constantly with ping-like requests to ever possible IP in your network range, causing anyone else on your network to be moderately annoyed with you. If you're really serious about doing that (which I will reiterate, is a bad idea), you just need to set an infinite loop to continuously search each IP in your local network's range, and use the isReachable(int something) call available as part of the inetAddress API, if you're running Java 1.5 or higher.
Like I said, I can tell you right now that you don't want to do this, at least in Java, and I would suggest looking for alternative network moderation utility methods, more specifically at the source of network communications on your network (ie, at the point of a firewall or router, where you can reasonably expect all users to go through as an access point).

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Possible to find ip addresses of everyone in an ad hoc network?

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