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Thread: help with mtu settings

  1. #1
    Junior Member
    Join Date
    Apr 2007

    help with mtu settings

    Have just found this website in the last week and is full of great information so i have started tweaking my internet connection but have found a problem

    my mtu setting seems to be limited to 1440 according to sg analyser

    even when i try

    ping routeraddress -f -l 1413

    in the cmd window the packets are not recieved till i drop to 1412 (1440-28 i believe is the correct value) so it must be a problem between pc and my dlink DSL-G604T

    i have used both tcpoptimizer and drtcp, set them to 1500, restarted but get the same mtu limit
    both programs report my mtu as 1500
    router mtu under wan settings is 1500
    i connect with a belkin 54g wireless dongle

    have tested the connection at work with the company equipment (they have the same type of router) and it goes up further so dont think the problem is there

    i read a post somewhere here that some software could limit the mtu so have included my hijack this list to see if anyone can spot anything, the only thing i can think could do this is 'getright' downloader but can find no mention on the net about it

    (wf2k is my graphics card software)

    thanks for your time and help

    Logfile of Trend Micro HijackThis v2.0.0 (BETA)
    Scan saved at 23:31:50, on 26/04/2007
    Platform: Windows XP SP2 (WinNT 5.01.2600)
    Boot mode: Normal

    Running processes:
    C:\Program Files\Belkin\Belkin Wireless Network Utility\WLService.exe
    C:\Program Files\Belkin\Belkin Wireless Network Utility\WLanCfgG.exe
    C:\Program Files\Common Files\McAfee\HackerWatch\HWAPI.exe
    c:\program files\common files\mcafee\mna\mcnasvc.exe
    C:\Program Files\McAfee\MPF\MPFSrv.exe
    C:\Program Files\Internet Explorer\iexplore.exe

    R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar =
    R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page =
    R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
    R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL =
    R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page =
    R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page =
    O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
    O2 - BHO: bho2gr Class - {31FF080D-12A3-439A-A2EF-4BA95A3148E8} - C:\Program Files\GetRight\xx2gr.dll
    O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
    O2 - BHO: scriptproxy - {7DB2D5A0-7241-4E79-B68D-6309F01C5231} - c:\program files\mcafee\virusscan\scriptcl.dll
    O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
    O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
    O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
    O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit
    O4 - HKLM\..\Run: [WinFoxV2] C:\WINDOWS\system32\WF2K.EXE Initial
    O4 - HKLM\..\Run: [WinFast2KLoadDefault] rundll32.exe C:\WINDOWS\system32\wf2kcpl.dll,DllLoadDefaultSettings
    O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'LOCAL SERVICE')
    O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'NETWORK SERVICE')
    O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
    O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
    O8 - Extra context menu item: Download with GetRight - C:\Program Files\GetRight\GRdownload.htm
    O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office10\EXCEL.EXE/3000
    O8 - Extra context menu item: Open with GetRight Browser - C:\Program Files\GetRight\GRbrowse.htm
    O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
    O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
    O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
    O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
    O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
    O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
    O16 - DPF: {4ED9DDF0-7479-4BBE-9335-5A1EDB1D8A21} ( Operating System Class) -
    O17 - HKLM\System\CCS\Services\Tcpip\..\{CCC57936-168B-4E61-B858-8AE38B757BAB}: NameServer =
    O22 - SharedTaskScheduler: Browseui preloader - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\System32\browseui.dll
    O22 - SharedTaskScheduler: Component Categories cache daemon - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\System32\browseui.dll
    O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
    O23 - Service: Belkin Wireless USB Network Adapter (Belkin Wireless USB Network Adapter Service) - Unknown owner - C:\Program Files\Belkin\Belkin Wireless Network Utility\WLService.exe
    O23 - Service: COM+ System Managerment - Unknown owner - C:\Program Files\Common Files\Microsoft Shared\MSINFO\complus.exe
    O23 - Service: McAfee E-mail Proxy (Emproxy) - McAfee, Inc. - C:\PROGRA~1\COMMON~1\McAfee\EmProxy\emproxy.exe
    O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
    O23 - Service: McAfee HackerWatch Service - McAfee, Inc. - C:\Program Files\Common Files\McAfee\HackerWatch\HWAPI.exe
    O23 - Service: McAfee Update Manager (mcmispupdmgr) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcupdmgr.exe
    O23 - Service: McAfee Services (mcmscsvc) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
    O23 - Service: McAfee Network Agent (McNASvc) - McAfee, Inc. - c:\program files\common files\mcafee\mna\mcnasvc.exe
    O23 - Service: McAfee Scanner (McODS) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcods.exe
    O23 - Service: McAfee Protection Manager (mcpromgr) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcpromgr.exe
    O23 - Service: McAfee Redirector Service (McRedirector) - McAfee, Inc. - c:\PROGRA~1\COMMON~1\mcafee\redirsvc\redirsvc.exe
    O23 - Service: McAfee Real-time Scanner (McShield) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
    O23 - Service: McAfee SystemGuards (McSysmon) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
    O23 - Service: McAfee Personal Firewall Service (MpfService) - McAfee, Inc. - C:\Program Files\McAfee\MPF\MPFSrv.exe
    O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
    O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
    O23 - Service: PnkBstrA - Unknown owner - C:\WINDOWS\system32\PnkBstrA.exe
    O23 - Service: ServiceLayer - Nokia. - C:\Program Files\PC Connectivity Solution\ServiceLayer.exe

    End of file - 7117 bytes

  2. #2
    Dr Tweak mnosteele52's Avatar
    Join Date
    Jul 2001
    Chesapeake, VA
    Please post a TCP/IP Analyzer test and tell us what type of connection you have.

    Help & Tips - CableNut Tcp/Ip Analyzer TCPOptimizer - Dr Tweak

  3. #3
    Junior Member
    Join Date
    Apr 2007
    max adsl from fast4 (uk)
    using pppoa
    my dlink is uk but i flashed the firmware to V2.00B05.AU_20060711 which is the australian version (which was the latest one at the time) TCP Analyzer Results
    Tested on: 04.27.2007 03:33
    IP address:

    TCP options string: 020405780103030201010402
    MSS: 1400
    MTU: 1440
    TCP Window: 257600 (multiple of MSS)
    RWIN Scaling: 2
    Unscaled RWIN : 64400
    Reccomended RWINs: 64400, 128800, 257600, 515200
    BDP limit (200ms): 10304kbps (1288KBytes/s)
    BDP limit (500ms): 4122kbps (515KBytes/s)
    MTU Discovery: ON
    TTL: 46
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

  4. #4
    Elite Member trogers's Avatar
    Join Date
    Jan 2005
    Bangkok, Thailand
    Suggest you update your firmware to latest for the UK (not Aust):

    After that, save and reboot your DLink and log into it to set your MTU or MRU to 1500 and MSS to 1460.

  5. #5
    Junior Member
    Join Date
    Apr 2007
    finding out some info about that soon hopefully as regrading the firmware is a little more difficult i believe

    anything else to check while i am waiting


  6. #6
    Junior Member
    Join Date
    Apr 2007
    with router and pc both set to 1500 i still recive websites ok but tcp analyzer still says i am only set to 1440

    after thinking about it for a while the ping test to the router itself in cmd would surely override any software on the machine and as i am pinging my router there is nothing else to cause this limit except the router itself

    does this sound correct

  7. #7
    Elite Member trogers's Avatar
    Join Date
    Jan 2005
    Bangkok, Thailand
    Quote Originally Posted by MrZoot View Post
    with router and pc both set to 1500 i still recive websites ok but tcp analyzer still says i am only set to 1440

    after thinking about it for a while the ping test to the router itself in cmd would surely override any software on the machine and as i am pinging my router there is nothing else to cause this limit except the router itself

    does this sound correct
    Yes, it is quite common to find the firmware of the router limiting MTU, especially if there is a mismatch of firmware with the ISP's system - eg. running ADSL firmware on an ISP's newer ADSL2+2 system.

  8. #8
    Junior Member
    Join Date
    Apr 2007
    thanks, think i will try the uk firmware for a while and see if it tweeks ok and if there is any performance gain

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