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Protocol Error Ndt

The NDT Server uses a web100 project to perform a detailed connection measurements. Internet2 Mailing List Service Skip to Content. FastRetran The number of invocations of the Fast Retransmit algorithm. NDT implements the above heuristic by checking that the following conditions are all true: The throughput measured during the Server-To-Client test is greater than 50 Mbps The Total Send Throughput is http://caribtechsxm.com/protocol-error/protocol-error-17.php

msgLen = sizeof(buff); if (recv_msg(ctlSocket, &msgType, buff, &msgLen)) { log_println(0, "Protocol error - expected version message!"); exit(1); } if (check_msg_type("Negotiating NDT version", MSG_LOGIN, msgType, buff, msgLen)) { exit(2); } if (msgLen This state is entered whenever TCP transmission stops due to Receiver not being able to receive data. However, the increased information that the web100 variables provide could be used to answer this question. About NDT NDT was written by Rich Carlson and volunteer contributors and is maintained by Internet2. https://lists.internet2.edu/sympa/arc/ndt-users/2007-06/msg00002.html

This applet is signed by the New America Foundation, whose Open Technology Initiative is a partner in Measurement Lab. All Clients MUST always request the TEST_STATUS (16 (1L << 4)) test in order to notify the Server that they support the MSG_WAITING messages introduced in the NDT v3.5.5. In other words, wait = num of minutes to wait = number of queued clients */ xwait = (xwait * 60); log_print(0, "Another client is currently begin served, your test will

MaxMSS The maximum MSS, in octets. NDT message - Another client is currently being served, your test will begin within NNN seconds To ensure accurate results, NDT servers are designed to handle a limited number of tests The throughput value MUST be calculated using the following formula: THROUGHPUT_VALUE = 8 * TRANSMITTED_BYTES / 1000 / TEST_DURATION_SECONDS The Client's TEST_MSG message looks as following: Following the throughput value, the Convey 60 sec * number of tests-suites waiting in the queue.

Examples of non-multiplicative window reductions include Congestion Window Validation RFC2861 and experimental algorithms such as Vegas. It means the estimated number of minutes that the Client will wait for its test to begin. Similarly, when the client IP address seen by the server is different from the one known to the client itself, a NAT box is modifying the client's IP address. This tcpdump trace dump is only started when the -t, --tcpdump options are set by the NDT administrator.

Information received from the Client is encoded as key/value pairs. During very busy times, NDT may queue a small number of newly arriving tests so that it can adequately serve tests that are already in progress. got ' 1', msgtype=2 This is the second area we need to see more about. This means that the Server is also collecting the web100 data variables, that MUST be send to the Client at the end of the whole test session.

Possible Duplex Mismatch condition " "caused Server to client test to run long.\nCheck for host=Full " "and switch=Half mismatch condition\n", ServerType); } } /** * This routine decodes the middlebox test https://github.com/ndt-project/ndt/wiki/WarningsAndMessages WinScaleRcvd The value of the received window scale option if one was received; otherwise, a value of -1. Timeouts that are preceded by duplicate acknowledgments or other congestion signals (e.g., ECN) are not counted as abrupt, and might have been avoided by a more sophisticated Fast Retransmit algorithm. The connection spends over 60% of the time in the congestion window limited state.

At the end the Server MUST close the META test session by sending an empty TEST_FINALIZE message. this contact form WinScaleSent The value of the transmitted window scale option if one was sent; otherwise, a value of -1. We recommend upgrading to the latest Safari, Google Chrome, or Firefox. The current version of the protocol is backwards compatible to version 3.3.12.

The client link duplex mismatch detection uses the following heuristic. This tcpdump trace dump is only started when the -t, --tcpdump options are set by the NDT administrator. This mechanism is a part of the duplex mismatch detection. have a peek here Done > > running 10s outbound test (client to server) . . . . . 901.99 Mb/s > > Protocol error! > > S2C throughput test FAILED! > > Protocol error!

Timeouts The number of times the retransmit timeout has expired when the RTO backoff multiplier is equal to one. Duration The seconds part of the time elapsed between StartTimeStamp and the most recent protocol event (segment sent or received). without any delays) for 10 seconds.

In order to start the test, the Server MUST send an empty TEST_START message using the NDTP-Control connection.

Particularly, it may or may not include the retransmit queue. Since the "The packet loss" is less than 1%, then the packet loss multiplied by 100 and divided by the total test time in seconds is less than 1. MaxSsthresh The maximum slow start threshold, excluding the initial value. The Server MUST send at least the following variables: AckPktsIn CountRTT CongestionSignals CurRTO CurMSS DataBytesOut DupAcksIn MaxCwnd MaxRwinRcvd PktsOut PktsRetrans RcvWinScale Sndbuf SndLimTimeCwnd SndLimTimeRwin SndLimTimeSender SndWinScale SumRTT Timeouts At the end

Moreover, this test uses a pre-defined Maximum Segment Size (MSS) to check if any intermediate node is modifying the connection settings. These results MUST be sent in a set of MSG_RESULTS messages: All standard results MUST be encoded as a human-readable strings to allow the Client to display them directly on the The NDT Client in the C2S Throughput test MUST use a 8192 Byte buffer to send the packets through the newly opened connection as fast as possible (i.e. Check This Out The throughput value MUST be calculated using the following formula: THROUGHPUT_VALUE = 8 * TRANSMITTED_BYTES / 1000 / TEST_DURATION_SECONDS At the end the Server MUST close the MID test session by

We need to see what the server is sending to cause this. <-- S2C throughput test --> Protocol error - missed prepare message! SACKsRcvd The number of SACK options received. Is that the host you were running the test to?Cheers,AaronPost by Jianan WangAny help is appreciated.Thanks.--Jianan WangDepartment of Electrical and Computer Engineering, Duke UniversityDepartment of Optical Engineering, ZJU Information EngineeringQizhen Leadership The server performs a 5 second throughput test over the connection The server can temporarily stop sending packets when the following formula is fulfilled: BUFFER_SIZE * 16 < ((Next Sequence Number

Protocol error! NDT implements the above heuristic by checking that the following conditions are all true: The cumulative time spent in the 'Sender Limited' state is less than 0.6 ms The number of Total Send Throughput The Total Send Throughput is the total amount of data (including retransmits) sent by the NDT Server to the NDT Client in the Server-To-Client throughput test. One of the MAJOR issues facing commodity Internet users is the performance limiting host configuration settings for the Windows XP operating system.