MTU settings in 300R2U

[vijaya901]

/members/vijaya901/
will try further ideas later today.

1100AM 11th sept

Can you give the Registry ref or post a screen shot where MTU 1460 is shown as default ?
http://www.pctools.com/guides/registry/detail/280/

Restart Windows for the change to take effect.
Normally , I do not attempt any changes using Regedit.
You have said , even if you change it with external programs like DRTCP/ etc
the MTU value remains same 1460.

Thanks for the response. I tried it many times. Restarted may times. The programmes correctly show the values but still the websites shows MTU as 1460 and TCP window is also remain same. These programmes make changes in windows registry but this modem/router is not minding it and it uses its own value.

 

[essbebe]

@vijaya901. Update.
Problem :MTU 1460 cannot be changed in Modem UT300R2U
External programs/Windows registry seem to change the MTU
but MTU remains 1460.
Para two:
open 192.168.1.1/main.html
IN menu Advanced WAN . In the page where you enter User Id and password
Option to enter MTU ( 1000-2000) may be available.
I find your modem menu pages same as Beetel 220Bx or 110Bx, TRY again.
Post Device status page. screen shot.
http://i22.tinypic.com/152byh3.jpg from Data base.
Presently using 110BX1
Device Info
Board ID: 96338L-2M-8M
Software Version: 3.12L.01.A2pB023k.d20k_rc2
Bootloader (CFE) Version: 1.0.37-12.1

 

[vijaya901]

I cannot find any option to put MTU. I am attaching the screenshots of UserID page and WAN status.

http://img148.imageshack.us/my.php?image=passwordkh9.jpg

WAN Device:

http://img98.imageshack.us/my.php?image=wanpa9.jpg

 

[essbebe]

UPDATE: MTU always 1460 cannot change. ( modem UT300R2U ( beetel220BX equivalent )@members/vijaya901/If the option is not available , means the MTU/MSS can not be entered in modem.A firmware update may be required. Very difficult to get for UTSTAR and Huawei modems, from manufacturer's site/s. In Rapid share some links may be posted. Or you can try Beetel 220BX in Wiki here. ( * at your own risk !)This option may not be available also. ( I don't remember seeing it in Beetel 220BXwhich I used for more than two years and recently in Beetel 220BX1 )Will try for 110BX1 FW link.

 

[vijaya901]

Thanks for the reply. Can we just disable those router functions and use it just like a modem like some UTstar modems which BSNL gave when they intially started? Those black modems. In those types of modems we cannot even log into them(192.168.1.1).

 

[essbebe]

TZ Connection Booster - Free software downloads and reviews - CNET Download.comTry this program .

Give registry entry details.

 

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[vijaya901]

TZ Connection Booster - Free software downloads and reviews - CNET Download.comTry this program .

Give registry entry details.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]

"SackOpts"=dword:00000001
"TcpWindowSize"=dword:0001f400
"Tcp1323Opts"=dword:00000001
"DefaultTTL"=dword:00000080
"EnablePMTUBHDetect"=dword:00000000
"EnablePMTUDiscovery"=dword:00000001
"GlobalMaxTcpWindowSize"=dword:0000faf0
"TcpMaxDupAcks"=dword:00000002

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NdisWan\Parameters\Protocols\1]
"ProtocolType"=dword:00000800
"PPPProtocolType"=dword:00000021
"ProtocolMTU"=dword:000005d4

The problem is it is there in the registry but

 

[essbebe]

Yours set for ProtocolMTU"=dword:000005d4 (set for decimal 1492.)
to be set in .......................controlset\tcpip\parameters.
Open your registry and find the key below.
the key is [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ Tcpip\Parameters]
Registry Settings
System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\
Interfaces\[Adapter ID]]
Value Name: MTU
Data Type: REG_DWORD (DWORD Value)
Value Data: Default = 0xffffffff

decimal 1460 05B4
decimal 1480 05C8
decimal 1492 05D4
decimal 1500 05DC

Recommended Values
# 576 - Dial-up Connections
# 1492 - PPPoE Broadband Connections
# 1500 - Ethernet, DSL and Cable Broadband Connections
Restart Windows for the change to take effect.

 

[vijaya901]

Yours set for ProtocolMTU\"=dword:000005d4 (set for decimal 1492.)
to be set in .......................controlset\tcpip\parameters.


decimal 1460 05B4
decimal 1480 05C8
decimal 1492 05D4
decimal 1500 05DC

Tried but this is what I am getting all the time.
http://img526.imageshack.us/my.php?image=tcpipbz4.jpg

 

[essbebe]

14. The Analyzer does not show my MTU value correctly ?


The Analyzer extracts values drectly from packets that your system sends to our server. In other words, the MTU shown is what gets advertised to servers on the Internet.

The most likely cause of different MTU than what you have set for your Registry (using the Optimizer or manually) is that a NAT router on the path is limiting the MTU to a lower value. If you're behind a router, update it to the latest firmware and make sure that its MTU (if user sellectable) is set to the same value. If you are behind a router with recent firmware and no options to change MTU, you can always test whether it's the culprit by removing it and connecting your system to the Internet/Analyzer directly.

Other probable causes are PPPoE software on your system that uses different MTU, or in some rare cases an ISP limiting MTU values. Last, but not least make sure the Analyzer is examining your IP address and not some transparent proxy server.