Wireless Internet Service - How to Change MTU to 1500

[hankerford]

I have WIMAX 4G Wireless Home Modem with Clearwire. I have adjusted all of the settings in the registry and wireless router to MTU of 1500 but the MTU still reports as 1400 and MSS of 1360 in the TCP Analyzer results listed below. Is there somewhere that I can get the MTU to report as 1500 or am I just stuck with the results that I have been getting? My OS is Windows XP Pro, SP3. My ethernet port is on my motherboard and is a wired Intel Pro 1000 CT Network Connection gigabit ethernet port. My router is a dLInk DL-625 wireless 100mbps. My wireless modem is placed exactly where it should be placed according to Clear and I am only nine blocks from the tower which is on the same side of the street as I am.



« SpeedGuide.net TCP Analyzer Results »
Tested on: 06.07.2010 17:04
IP address: xxx.xxx.xxx.xxx
Client OS: Windows XP

TCP options string: 020405500103030401010402
MSS: 1360
MTU: 1400
TCP Window: 1044480 (multiple of MSS)
RWIN Scaling: 4 bits (2^4=16)
Unscaled RWIN : 65280
Recommended RWINs: 65280, 130560, 261120, 522240, 1044480
BDP limit (200ms): 41779kbps (5222KBytes/s)
BDP limit (500ms): 16712kbps (2089KBytes/s)
MTU Discovery: ON
TTL: 55
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

Hank

[rick121x]

Did you ever get this straightend out? I have a similar problem, very similar - and almost never get good internet service. Sometimes great high connection speeds, but poor internet service - just plain slow, not much better than DSL.

I did find a way to change the MTU on my PC TCPIP system. TCPoptimizer.exe from Speedguide.net does it easily. and DRTCPIP021.exe veryfifies it quickly.

What your routers are doing, must be corrected in their own control programs.

Let me know if you solve anything, please.

Richard

I have WIMAX 4G Wireless Home Modem with Clearwire. I have adjusted all of the settings in the registry and wireless router to MTU of 1500 but the MTU still reports as 1400 and MSS of 1360 in the TCP Analyzer results listed below. Is there somewhere that I can get the MTU to report as 1500 or am I just stuck with the results that I have been getting? My OS is Windows XP Pro, SP3. My ethernet port is on my motherboard and is a wired Intel Pro 1000 CT Network Connection gigabit ethernet port. My router is a dLInk DL-625 wireless 100mbps. My wireless modem is placed exactly where it should be placed according to Clear and I am only nine blocks from the tower which is on the same side of the street as I am.



« SpeedGuide.net TCP Analyzer Results »
Tested on: 06.07.2010 17:04
IP address: xxx.xxx.xxx.xxx
Client OS: Windows XP

TCP options string: 020405500103030401010402
MSS: 1360
MTU: 1400
TCP Window: 1044480 (multiple of MSS)
RWIN Scaling: 4 bits (2^4=16)
Unscaled RWIN : 65280
Recommended RWINs: 65280, 130560, 261120, 522240, 1044480
BDP limit (200ms): 41779kbps (5222KBytes/s)
BDP limit (500ms): 16712kbps (2089KBytes/s)
MTU Discovery: ON
TTL: 55
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

Hank

[hankerford]

I queried the tech support department and they told me that they were doing major upgrades to the antennas and I should have a response by the end of January 2011. So far, no response. There has been some improvement to download speeds, however, eradically. They speeds are only realized in the middle of the day before 4:00 pm; after that back to slow.

[Misthel]

MTU for Ethernet, for example, is 1500 bytes. Some types of networks (such as Token Ring) are more MTU, and some types have smaller MTUs, but the values for each physical technology. Unfortunately, many network devices use the terms interchangeably.

[adonyx]

I realize this is an old post, but since it was never properly answered I will complete it for users who may still need the answer.
SG's TCPoptimizer does not detect the Clearwire USB wireless adapter as a network adapter, therefore it will not apply any adapter-specific changes to your Clearwire USB adapter, therefore only the "global" settings that are tweaked will apply to it. I'm still trying to figure out how much of TCPoptimizer is rendered useless because of this.

The default MTU for the USB adapter is 1400. TCPoptimizer can not change this because TCPoptimizer does not recognize it as a network adapter, as is evident when you attempt to select the network adapter from SG TCP Optimizer GUI. The device is not listed. Even if you select the checkbox for "Modify All Network Adapters", the adapter settings for your USB wimax modem will not be changed. In order to manually change the MTU for your Clearwire Wimax adapter open "Device Manager", expand "Network Adapters", right-click "Wimax Network Adapter", select "Properties", click the "Advanced" tab. In the "Property" field below "MTU" will already be highlighted. To the right of that, you'll see the "Value" field which states "1400". Highlight "1400" and change it to "1500". Click "OK".

That solves the MTU portion. As for making sure the other settings are properly carried over, the quest is still ongoing.

[RaisinCain]

I realize this is an old post, but since it was never properly answered I will complete it for users who may still need the answer.
SG's TCPoptimizer does not detect the Clearwire USB wireless adapter as a network adapter, therefore it will not apply any adapter-specific changes to your Clearwire USB adapter, therefore only the "global" settings that are tweaked will apply to it. I'm still trying to figure out how much of TCPoptimizer is rendered useless because of this.

The default MTU for the USB adapter is 1400. TCPoptimizer can not change this because TCPoptimizer does not recognize it as a network adapter, as is evident when you attempt to select the network adapter from SG TCP Optimizer GUI. The device is not listed. Even if you select the checkbox for "Modify All Network Adapters", the adapter settings for your USB wimax modem will not be changed. In order to manually change the MTU for your Clearwire Wimax adapter open "Device Manager", expand "Network Adapters", right-click "Wimax Network Adapter", select "Properties", click the "Advanced" tab. In the "Property" field below "MTU" will already be highlighted. To the right of that, you'll see the "Value" field which states "1400". Highlight "1400" and change it to "1500". Click "OK".

That solves the MTU portion. As for making sure the other settings are properly carried over, the quest is still ongoing.

Yes it is an old post. Thank you for bumping it Captain Smartass. 1 post and now you're an expert? Don't bother asking which OS?

[adonyx]

Captain Smart-Ass? I'm confused. Did I step on somebody's toes by providing an answer? Do you have a "dog in this fight"? I don't see a prior post from you regarding this topic. And how is my answer a "smart ass" answer? And what's with the "now you're an expert?" bit? Your response seems entirely off-base, out of line, and unprovoked. Are you just some sort of insane person? Please explain.

[Philip]

Please try to ignore RaisinCain's tone, he can get grumpy at times... The OS is obviously XP as per the Analyzer results. He's right that there is probably no need to resurect a year old post, but oh well, at least you're trying to help

Most of the TCP Optimizer settings are not adapter-specific, with one notable exception being the MTU value.