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Verizon 4G/LTE USB Device with TCP Window Size Set to 128 or Higher

If you recently purchased a 4G/LTE USB device from Verizon Wireless, read on to optimize data throughput in your computer:

Certain Internet parameters and configurations (such as TCP settings) are preset by your operating system; to optimize the data throughput, set the TCP window size to at least 128K.

Instructions on how to set this window size are found in Microsoft's support webpages.

In addition, third party software (such as TCP optimizers) may be available to configure your operating system to be optimized for Mobile Broadband service. Verizon Wireless does not support any 3rd party software applications or the configuration of specific operating system settings at this time.

Please let us know if you have any additional questions, thanks.

Comments

toughbook

Thank you for pointing us to the link. However, it explains many TCP settings. Which one should we be looking for? Also, this article is for XP, what about other OS systems such as Vista and W7?

Thanks Again.

unknown

He says "TCP window size."

jgaona3

If you do not know what you are doing. It is better to just leave it alone. Here is another link so you can read up on it.

speedquide.net tcp info

MojaveMoon_

The Microsoft Kin Two(m) has a menu that lets you adjust the TCP Window Size. Someone reported that it's 32K by default. Would it be beneficial to adjust it to at least 128K ?

whatsupdoc

Windows Vista and 7 dynamically adjust the TCP Receive Window (RWIN). This adjustment would only be used for Windows XP systems.

Instructions for determining and adjusting the TCP window using Dr. TCP (freeware) is available from broadbandreports.com:

http://www.broadbandreports.com/faq/tweaks/5.+RWIN#6181

whatsupdoc

On a similar subject, the MTU size set for the LGE LTE USB NDIS Network Connection Driver as found in the Windows Device manager is set at 1428. The Verizon 4G LTE modem is a PPPoE connection, therefore, a setting of 1492 works just fine (I tested it and it works fine) and will provide better throughput of data. This is on Windows XP, Vista and 7 systems and can be changed on every LGE LTE USB NDIS Network Connection Driver found in the Device Manager (there will be as many devices as there are USB ports that the USB modem has been plugged into and installed.

Once changed the network connection will need to either be disconnected and restarted or reboot the PC for changes to take effect.

Prolixium

whatsupdoc wrote:
On a similar subject, the MTU size set for the LGE LTE USB NDIS Network Connection Driver as found in the Windows Device manager is set at 1428. The Verizon 4G LTE modem is a PPPoE connection, therefore, a setting of 1492 works just fine (I tested it and it works fine) and will provide better throughput of data. This is on Windows XP, Vista and 7 systems and can be changed on every LGE LTE USB NDIS Network Connection Driver found in the Device Manager (there will be as many devices as there are USB ports that the USB modem has been plugged into and installed.

Once changed the network connection will need to either be disconnected and restarted or reboot the PC for changes to take effect.

I'd be weary of doing this under normal circumstances. Do you have performance data indicating this does indeed increase performance?

I'm under the impression that the MTU is being set to 1428 to avoid link-layer fragementation on the way onto the LTE network. An MTU of 1492 (or even 1500, which is used on Linux by default with the LG VL600 modem) may appear to work fine, but could cause fragmentation when the packets are transmitted onto the RF network, therefore hurting performance instead.

Although, that being said, I haven't read over the LTE spec. to understand what type of MTU will cause link-layer fragmentation, but I have a feeling it's not being set to 1428 arbitrarily or to "slow down" clients :smileywink:

- Mark

whatsupdoc

Mark,

You bring up a very good point and I should be able to test this next week. I used the standard ping tests in Windows XP to arrive at this conclusion using various packet lengths until this setting was reached without any fragmenting or timing out.

I can say though that my download speeds are consistently in the 20-22 MB range and my upload speeds are consistently in the 4-5 MB range using this setting - absolutely tremendous for 4G LTE service and faster than my RoadRunner Turbo service.

~ Chris

1234567895

When can we have 4G Network In EU if urope doesn't has it ,how come US has it ? Don't get me Wrong ? is it Scam ?

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