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Thread: TCP Optimizer for 56K Dialup

  1. #1
    Junior Member
    Join Date
    Sep 2005

    Question 56K Dialup - See Second Reply for Information

    Hi All,

    I ran TCP Optimizer and optimized settings with the Slider at 56K for my 56K Dialup connection.

    System is Intel Celeron 2.66 Ghz and WinXP Home. I have a PCI Modem and a Serial Port External Modem and use one or the other.

    My system runs fine but I don't know yet whether it is faster.

    Two questions:

    1. TCP Optimizer only found my PCI Ethernet Adapter on the motherboard. Does this adapter come into play when using my PCI Modem or my Serial Port RS232 External Modem?

    2. I checked the Registry for changes, and my new MTU setting (576) appear to show up in local machine-system-currentcontrolset-services-tcpip-parameters.

    I have other information that for Dial-up the MTU setting should be under local machine-system-currentcontrolset-services-ndiswan-parameters-protocols-0.

    Just wondering which is correct, and whether I should be seeing improvement as the settings are today.

    Many thanks, Kent
    Last edited by KAWill2; 09-15-05 at 06:38 PM.

  2. #2
    Junior Member
    Join Date
    Sep 2005

    Update on 56K and More Questions!

    I tried a couple of things last night.

    Ran TCP Optimizer again and selected "Modify All Network Adapters" since I was not sure if the PCI Ethernet Adapter being the only available network interface would be correct for dial-up. Unfortunately, no new Registry changes showed up.

    I tried the online TCPIP Analyzer and it reported an MTU of 1500, despite the fact that TCP Optimizer had set MTU at 576 and the system had been rebooted.

    Shouldn't I have seen 576?

    Am I correct that once the TCPIP Stack is modified it would affect Dialup regardless of how my 56K modem connects or attaches to the computer?

    Bottom line, I'm wondering if TCP Optimizer can improve my dial-up connection speed and would appreciate any suggestions.

    Thanks, Kent

  3. #3
    Junior Member
    Join Date
    Sep 2005

    Answers to the Four Questions for Help!

    I've now read the FAQs and 56K Info. Thank you!!

    Here are the answers to the requested questions:

    1. Using Dialup with 56K Modem

    Speed Test using L.A. Server - Ran Twice with similar results

    Download: 38K bits/sec = 4.8 KB/s
    Upload: 108K bits/sec = 13.5 KB/s (Can't be with 56K - Problem with Test?)

    2. ISPs are Compuserve Classic, Compuserve 2000 (AOL), All2Easy, Seven Midgets

    3. Currently using WinXP Home with Windows Default Settings.

    Analyzer Results:

    TCP options string = 020405b4
    MTU = 1500
    MTU is fully optimized for broadband.
    MSS = 1460
    Maximum useful data in each packet = 1460, which equals MSS.
    Default Receive Window (RWIN) = 8760
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled Receive Window = 8760

    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)
    64240 (MSS x 44)
    bandwidth * delay product (Note this is not a speed test):

    Your RcvWindow limits you to: 350.4 kbps (43.8 KBytes/s) @ 200ms
    Your RcvWindow limits you to: 140.16 kbps (17.52 KBytes/s) @ 500ms
    Consider increasing your RWIN value to optimize TCP/IP for broadband.
    MTU Discovery (RFC1191) = ON
    Time to live left = 117 hops

    TTL value is ok.
    Timestamps (RFC1323) = OFF
    Selective Acknowledgements (RFC2018) = OFF
    IP type of service field (RFC1349) = 00000000 (0)

    4. Using WinXP Home, Intel Celeron 2.66 Ghz, Gigabyte Motherboard

    Can I gain anything significant from Tweaking using TCP Optimizer and Cablenut?

    Many thanks, Kent

    Last edited by KAWill2; 09-15-05 at 06:33 PM.

  4. #4
    fem the retarded rabbit mccoffee's Avatar
    Join Date
    Nov 2001
    Cleveland, Ohio, United States
    if you did the 56k tweaks then you probably at the best you can get
    Comptia a+ n+

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