return addresses.containsKey(address);
Collection c = addresses.values(); IPv4IfAddress ipv4IfAddress;  for (Iterator iterator = c.iterator(); iterator.hasNext();) { ipv4IfAddress = (IPv4IfAddress) iterator.next(); if (ipv4IfAddress.matches(address)) { return true; } }  return false;
	public boolean contains(IPv4Address address) {		return addresses.containsKey(address);	}