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Is it necessary for all the participating nodes in a wireless ad-hoc network to be in the vicinity of each other?

Suppose there are three nodes, all connected to the same ad-hoc network (configured explicitly): A, B, C. If A is too far from C to be within wireless range, but is close to B, can it communicate to C via B?

Will every node broadcast frames that it can see but are not addressed to it?

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up vote 2 down vote accepted

IBSS networks (which is what people usually mean by ad-hoc networks) do not do forwarding.

For that, you need a mesh network (like 802.11s, which is still a draft standard).

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might wanna do your homework first: – John T Sep 30 '09 at 13:37
I did do my homework. I only forgot to explicitly mention that by "ad-hoc" most people mean an IBSS (since "ad-hoc" is what the user interface says in these cases), which indeed does no forwarding. – CesarB Sep 30 '09 at 17:42

Depending on where node A is, it will pick a node to act as it's access point (like a router in a regular wireless setup).This access point will forward data for node A if A cannot access it locally.

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