public void testAllPairs(File file) {
		try {
			Scanner scan = new Scanner(file);
			while (scan.hasNextLine()) {
				String[] line = scan.nextLine().split("\t");
				if (line.length != 2)
					continue;
				String host = line[0].trim();
				int ip = stringToIP(line[1].trim());
				if (!testPair(ip, host)) {
					System.out.println("Missing: " + IPToString(ip) + " -> "
							+ host);
				}
				if (!testPair(host, ip)) {
					System.out.println("Missing: " + host + " -> "
							+ IPToString(ip));
				}
			}
			scan.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}