multicast ping

Hello all.

I've been out of the JGroups loop for a while but diligently perusing the mailing list.

I had a question about an app I need to write. What I need to do is, in a given moment send out a multicast "ping" and return the ip of the first machine that answers. I know that internally this is what JGroups does to keep an updated list of "alive" machines. My question is, can I use the same internal mechanism JGroups uses? I don't think so, not without deconstructing the code.

The other option is to send out my own multicast message, but if I'm not mistaken, multicast messages don't send back responses.

Any thoughts?

Thanks in advance,
Bob

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