Hello,here are the results
TCP options string = 020405840103030101010402
MTU = 1452
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings.
MSS = 1412
MSS is not optimized for broadband. Consider increasing your MTU value.
Default TCP Receive Window (RWIN) = 124256
RWIN Scaling (RFC1323) = 1 bits (scale factor of 2)
Unscaled TCP Receive Window = 62128
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
519616 (MSS x 46 * scale factor of
259808 (MSS x 46 * scale factor of 4)
129904 (MSS x 46 * scale factor of 2)
64952 (MSS x 46)
bandwidth * delay product (Note this is not a speed test):
Your TCP Window limits you to: 4970.24 kbps (621.28 KBytes/s) @ 200ms
Your TCP Window limits you to: 1988.096 kbps (248.512 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 35 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 11110000 (240)
Precedence (priority) = 111 (Network Control)
Delay = 1 (low delay)
Throughput = 0 (normal throughput)
Reliability = 0 (normal reliability)
Cost = 0 (normal cost)
Check bit = 0 (correct, 8th checking bit must be zero)
DiffServ (RFC 2474) = No valid DiffServ equivalent. See the TCP Optimizer documentation, or RFCs 2474, 2475, 2597, 2598, 2873.
TCP/Web100 Network Diagnostic Tool v5.3.3d
click START to begin
Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
running 10s outbound test (client to server) . . . . . 301.83Kb/s
running 10s inbound test (server to client) . . . . . . 445.82kb/s
Your PC is connected to a Cable/DSL modem
Information: The receive buffer should be 284.97 Kbytes to maximize throughput
Cable modem/DSL/T1 link found.
Link set to Full Duplex mode
No network congestion discovered.
Good network cable(s) found
Normal duplex operation found.
Web100 reports the Round trip time = 778.18 msec; the Packet size = 1412 Bytes; and
There were 37 packets retransmitted, 85 duplicate acks received, and 108 SACK blocks received
The connection was idle 0 seconds (0%) of the time
This connection is receiver limited 28.86% of the time.
Increasing the the client's receive buffer (121.0 KB) will improve performance
This connection is network limited 71.11% of the time.
Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: ON
Information: Network Middlebox is modifying MSS variable
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
Server says [201.10.42.218] but Client says [10.1.1.5]
WEB100 Kernel Variables:
Client: localhost/127.0.0.1
AckPktsIn: 254
AckPktsOut: 0
BytesRetrans: 52244
CongAvoid: 18
CongestionOverCount: 0
CongestionSignals: 2
CountRTT: 148
CurCwnd: 18356
CurMSS: 1412
CurRTO: 1400
CurRwinRcvd: 124256
CurRwinSent: 16304
CurSsthresh: 15532
DSACKDups: 0
DataBytesIn: 0
DataBytesOut: 632576
DataPktsIn: 0
DataPktsOut: 448
DupAcksIn: 85
ECNEnabled: 0
FastRetran: 2
MaxCwnd: 125668
MaxMSS: 1412
MaxRTO: 2270
MaxRTT: 1860
MaxRwinRcvd: 124256
MaxRwinSent: 16304
MaxSsthresh: 62128
MinMSS: 1412
MinRTO: 680
MinRTT: 260
MinRwinRcvd: 62128
MinRwinSent: 16304
NagleEnabled: 1
OtherReductions: 0
PktsIn: 254
PktsOut: 448
PktsRetrans: 37
X_Rcvbuf: 103424
RcvWinScale: 7
SACKEnabled: 3
SACKsRcvd: 108
SendStall: 0
SlowStart: 99
SampleRTT: 300
SmoothedRTT: 320
X_Sndbuf: 103424
SndWinScale: 1
SndLimTimeRwin: 3019613
SndLimTimeCwnd: 7440087
SndLimTimeSender: 2596
SndLimTransRwin: 1
SndLimTransCwnd: 2
SndLimTransSender: 1
SndLimBytesRwin: 73424
SndLimBytesCwnd: 559152
SndLimBytesSender: 0
SubsequentTimeouts: 0
SumRTT: 115170
Timeouts: 0
TimestampsEnabled: 0
WinScaleRcvd: 1
WinScaleSent: 7
DupAcksOut: 0
StartTimeUsec: 464922
Duration: 10465652
c2sData: 2
c2sAck: 2
s2cData: 9
s2cAck: 2
half_duplex: 0
link: 100
congestion: 0
bad_cable: 0
mismatch: 0
spd: 0.00
bw: 0.21
loss: 0.004464286
avgrtt: 778.18
waitsec: 0.00
timesec: 10.00
order: 0.3346
rwintime: 0.2886
sendtime: 0.0002
cwndtime: 0.7111
rwin: 0.9480
swin: 64.0000
cwin: 0.9588
rttsec: 0.778176
Sndbuf: 8388608
aspd: 1.93318
Checking for mismatch on uplink
(speed > 50 [0>50], (xmitspeed < 5) [0.30<5]
(rwintime > .9) [0.28>.9], (loss < .01) [0.00<.01]
Checking for excessive errors condition
(loss/sec > .15) [4.46>.15], (cwndtime > .6) [0.71>.6],
(loss < .01) [0.00<.01], (MaxSsthresh > 0) [62128>0]
Checking for 10 Mbps link
(speed < 9.5) [0<9.5], (speed > 3.0) [0>3.0]
(xmitspeed < 9.5) [0.30<9.5] (loss < .01) [0.00<.01], (mylink > 0) [3.0>0]
Checking for Wireless link
(sendtime = 0) [2.0E=0], (speed < 5) [0<5]
(Estimate > 50 [0.21>50], (Rwintime > 90) [0.28>.90]
(RwinTrans/CwndTrans = 1) [1/2=1], (mylink > 0) [3.0>0]
Checking for DSL/Cable Modem link
(speed < 2) [0<2], (SndLimTransSender = 0) [1=0]
(SendTime = 0) [2.0E-4=0], (mylink > 0) [3.0>0]
Checking for half-duplex condition
(rwintime > .95) [0.28>.95], (RwinTrans/sec > 30) [0.1>30],
(SenderTrans/sec > 30) [0.1>30], OR (mylink <= 10) [3.0<=10]
Checking for congestion
(cwndtime > .02) [0.71>.02], (mismatch = 0) [0=0]
(MaxSsthresh > 0) [62128>0]
estimate = 0.21 based on packet size = 11Kbits, RTT = 778.18msec, and loss = 0.004464286
The theoretical network limit is 0.21 Mbps
The NDT server has a 8192.0 KByte buffer which limits the throughput to 82.24 Mbps
Your PC/Workstation has a 121.0 KByte buffer which limits the throughput to 1.21 Mbps
The network based flow control limits the throughput to 1.23 Mbps
Client Data reports link is 'T1', Client Acks report link is 'T1'
Server Data reports link is '10 Gig', Server Acks report link is 'T1'
