code: public static base_responses update(nitro_service client, rnat resources[]) throws Exception {
  		base_responses result = null;
  		if (resources != null && resources.length > 0) {
  			rnat updateresources[] = new rnat[resources.length];
  			for (int i=0;i<resources.length;i++){
  				updateresources[i] = new rnat();
  				updateresources[i].network = resources[i].network;
  				updateresources[i].netmask = resources[i].netmask;
  				updateresources[i].natip = resources[i].natip;
  				updateresources[i].td = resources[i].td;
  				updateresources[i].aclname = resources[i].aclname;
  				updateresources[i].redirectport = resources[i].redirectport;
  				updateresources[i].natip2 = resources[i].natip2;
  			}
  			result = update_bulk_request(client, updateresources);
  		}
  		return result;
  	}
docs: Use this API to update rnat resources.