help with mtu settings

**MrZoot** · 04-26-07, 06:12 PM

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:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
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:\WINDOWS\SOUNDMAN.EXE
C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
c:\program files\common files\mcafee\mna\mcnasvc.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcods.exe
C:\PROGRA~1\McAfee\MSC\mcpromgr.exe
c:\PROGRA~1\COMMON~1\mcafee\redirsvc\redirsvc.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
C:\Program Files\McAfee\MPF\MPFSrv.exe
C:\WINDOWS\system32\WF2K.EXE
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\system32\PnkBstrA.exe
C:\WINDOWS\System32\svchost.exe
C:\PROGRA~1\mcafee.com\agent\mcagent.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\iexplore.exe
D:\Downloads\HiJackThis_v2.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.orange.co.uk/iesearch/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.co.uk/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
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
O14 - IERESET.INF: START_PAGE_URL=http://www.orange.co.uk/
O16 - DPF: {4ED9DDF0-7479-4BBE-9335-5A1EDB1D8A21} (McAfee.com Operating System Class) - http://download.mcafee.com/molbin/sh...1/mcinsctl.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{CCC57936-168B-4E61-B858-8AE38B757BAB}: NameServer = 10.1.1.1
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

**mnosteele52** · 04-26-07, 07:27 PM

Please post a TCP/IP Analyzer test and tell us what type of connection you have.

**MrZoot** · 04-27-07, 02:38 AM

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)

« SpeedGuide.net TCP Analyzer Results »
Tested on: 04.27.2007 03:33
IP address: 85.92.xxx.xxx

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)

**trogers** · 04-27-07, 07:39 AM

Suggest you update your firmware to latest for the UK (not Aust):

http://www.dlink.co.uk/?go=jN7uAYLx/...G5/jQDkMVLFP8=

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

**MrZoot** · 04-27-07, 03:15 PM

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

thanks

**MrZoot** · 04-27-07, 06:17 PM

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

**trogers** · 04-27-07, 08:30 PM

Originally Posted by MrZoot

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.