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help with cable speed


Gib4500
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I have adelphia cable internet and i only get 1.5mb down max.  I am on the advertised 4mb down plan.  My upload is ok but my downstream is not anywhere near 4mb.  I have tried a number of things, i have tweaked my connection, i have connected via usb, i have tried a friends computer, i have tried a different modem, and nothing seems to help.  can anyone help or give me any suggestions thanks.  :angry5:

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1.  os- win xp 64

2.  isp adelphia 4mb 384

3.  i have used cable nut and and tcp optimizer 

TCP options string = 020405b401010402

MTU = 1500

MTU is fully optimized for broadband.

MSS = 1460

Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 64240

RWIN Scaling (RFC1323) = 0 bits

Unscaled Receive Window = 64240

RWIN is a multiple of MSS

Other values for RWIN that might work well with your current MTU/MSS:

513920 (MSS x 44 * scale factor of 8)

256960 (MSS x 44 * scale factor of 4)

128480 (MSS x 44 * scale factor of 2) 

bandwidth * delay product (Note this is not a speed test):

Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms

Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 54 hops

TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349) = 00000000 (0)

i'll get to the rest in a minute thanks. 

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4.  testmy net speed-  https://testmy.net/stats/id-40PIM1VEY

    TCP/Web100 Network Diagnostic Tool v5.3.3d

click START to begin

Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done

running 10s outbound test (client to server) . . . . . 476.93Kb/s

running 10s inbound test (server to client) . . . . . . 1.38Mb/s

Your PC is connected to a Cable/DSL modem

Information: The receive buffer should be 124.56 Kbytes to maximize throughput

Microsoft Windows [Version 5.2.3790]

Pinging testmy.net [67.18.179.85] with 32 bytes of data:

Reply from 67.18.179.85: bytes=32 time=72ms TTL=51

Reply from 67.18.179.85: bytes=32 time=69ms TTL=51

Reply from 67.18.179.85: bytes=32 time=70ms TTL=51

Reply from 67.18.179.85: bytes=32 time=67ms TTL=51

Ping statistics for 67.18.179.85:

    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 67ms, Maximum = 72ms, Average = 69ms

Ping Complete.

Tracing route to testmy.net [67.18.179.85]

over a maximum of 30 hops:

  1    5 ms    *        9 ms  10.42.92.1

  2    9 ms    7 ms    8 ms  69.165.28.45

  3    10 ms    7 ms    7 ms  69.165.28.49

  4    28 ms    41 ms    31 ms  69.165.28.33

  5    30 ms    31 ms    31 ms  g1-01-00-00.a0.cle00.adelphiacom.net [66.109.14.101]

  6    30 ms    46 ms    38 ms  p3-00-01-00.c0.pit75.adelphiacom.net [66.109.1.105]

  7    54 ms    43 ms    45 ms  p3-01-01-00.c1.chi75.adelphiacom.net [66.109.0.209]

  8    70 ms    67 ms    67 ms  p3-01-01-00.c1.dfw91.adelphiacom.net [66.109.0.66]

  9    67 ms    69 ms    75 ms  g1-03-02-00.p0.dfw91.adelphiacom.net [66.109.3.78]

10    68 ms    68 ms    70 ms  eq-dallas-1000M.theplanet.com [206.223.118.3]

11    70 ms    71 ms    67 ms  vl32.dsr02.dllstx3.theplanet.com [70.85.127.62]

12    71 ms    71 ms    71 ms  vl42.dsr02.dllstx4.theplanet.com [70.85.127.91]

13    70 ms    69 ms    94 ms  gi1-0-2.car17.dllstx4.theplanet.com [67.18.116.85]

14    68 ms    92 ms    71 ms  85.67-18-179.reverse.theplanet.com [67.18.179.85]

Trace complete.

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