open_vconn(argv[1], &vconn);
request = make_echo_request(vconn_get_version(vconn));
run(vconn_transact(vconn, request, &reply), "talking to %s", argv[1]);
open_vconn(argv[1], &vconn);
request = make_echo_request(vconn_get_version(vconn));
run(vconn_transact(vconn, request, &reply), "talking to %s", argv[1]);