private void addNeighbors(IP a,
			HashSet<IP> inserted,
			LinkedList<IP> queue)
	{
		if (graph.neighbors(a)!=null)
			for (IP b : graph.neighbors(a))
				if (!inserted.contains(b)) {
					inserted.add(b);
					if (!ownAddress.equals(a))
						table.put(b, a);
					queue.add(b);
				}
	}