trogers

Thank God for our "DIY'....! Better call Charter to cancel that tech visit...lol.

Where are you located and what is your advertised speed?

If it is 256/128 Kbps, then this buffer of 31 Kbytes is sufficient for you at RTT 488 ms.

If after trying both and MTU is still set at 1452, here is a ccs file for this setting.

After loading this ccs file and speed testing, you can make modifications to the following 2 fields and see if it works better:

DefaultReceiveWindows - 62128

Tcp13230pts - 0

RWIN setting of 124256 is suitable for latency range of 150-300 ms.

RWIN setting of 62128 is suitable for latency less than 150 ms.

Hi Artic Wolf,

We can try to use the TCP Optimizer to set the MTU to its highest value if this value is not a limitation imposed by your modem/router. In the latter case, adjustment has to be made by tweaking the driver of the hardware.

Download the TCP Optimizer at www.speedguide.net and do the following:

General Settings tab:

Custom settings - check

Modify All Network Adapters - check

network adapter selection - your NIC

MTU - 1500

TTL - 64

TCP Receive Window - blank

MTU Discovery - Yes

Black Hole Detect - No

Selective Acks - Yes

Max Duplicate ACKs - 2

TCP 1323 Options:

Windows Scaling - uncheck

Timestamps - uncheck

Advanced Settings tab:

Max Connections per Server - 10

Max Connections per 1.0 Server - 20

LocalPriority - 5

Host Priority - 6

DNSPriority - 7

NetbtPriority - 8

Lan Browsing speedup - optimized

QoS: NonBestEffortLimit - 0

ToS: DisableUserTOSSetting - 0

ToS: DefaultTOSValue - 240

MaxNegativeCacheTtl - 0

NetFailureCacheTime - 0

NegativeSOACache Time - 0

LAN Request Buffer Size - 32768

Then select "Apply Changes" and reboot to take effect

You can use the feature in TCP Optimizer to find the value of your largest MTU.

Open TCP Optimizer, set MTU to 1500, click 'Largest MTU', then enter any website address and click 'Start'. Your comp will send out pings and establish your system's largest MTU value.

If your largest MTU value is more than 1452 we can make a ccs file for you following the value.

Hi,

Your tracert seems to be better now. As to your comp setting, your RWIN setting of 256960 is a step too high for a 4 Mbps throughput.

Try this ccs file and then carry out your speed tests and post.

Do this 2 tests and post. We can then know if your comp needs tweaking or your network is over subscribed, or both:

https://www.speedguide.net/analyzer.php

http://nitro.ucsc.edu/

Your buffer has been reduced from 31 Kbytes to 17 Kbytes. Did you load a different ccs file?

estimate = 9.04 based on packet size = 11Kbits, RTT = 1232.65msec, and loss = 1.0E-6

The theoretical network limit is 9.04 Mbps

The NDT server has a 8192.0 KByte buffer which limits the throughput to 51.92 Mbps

Your PC/Workstation has a 125.0 KByte buffer which limits the throughput to 0.79 Mbps

The network based flow control limits the throughput to 0.80 Mbps

Your RTT is still too high. This usually means something is limiting a clear signal flow. Can be a line quality problem or a faulty cable, or effects on your signalling devices (modem/router). If you are running a wireless, then it may be a problem with signal transmission to your router.

Please do some troubleshooting. When RTT goes down, PC throughput limit will go up and so does your download speed.

Here is a link that may help you to located possible line problem:

http://www.dslreports.com/faq/faq/8.%20Home%20wiring 

That is good. If your speed range start to fall again, most likely it will mean that electrical device that is emitting EMI has been turned on. This device can even be located on the other side of the wall where your comp is located. A spin dryer, or some thing high powered.

good morning,

The new position for the modem has turned out to be worse than before. You can see it from the RTT value of the test.

"estimate = 11.17 based on packet size = 11Kbits, RTT = 991.44msec, and loss = 1.0E-6

The theoretical network limit is 11.17 Mbps

The NDT server has a 1088.0 KByte buffer which limits the throughput to 8.57 Mbps

Your PC/Workstation has a 31.0 KByte buffer which limits the throughput to 0.24 Mbps. The network based flow control limits the throughput to 0.25 Mbps"

Try to move it about and then retest by yourself. When your RTT can be less than 300 ms (or even better still less than 200 ms) you will see your PC throughput limit go up from 0.24 to 0.50-0.60 Mbps. This throughput is about the same as your download speed. When RTT becomes lower, download speed will be faster.

Do your speed test with antivirus turned off.

Move it further from the motherboard.

A slight improvement. If you can move your modem aother foot higher it may be better. In the mean time, use this ccs file.

Choose anyone nearest to you from this link:

http://e2epi.internet2.edu/ndt/ndt-server-list.html

Yes do the nitro test again.

Relocate your modem or raise your modem a foot up away from your motherboard with some books or other insulating material.

"estimate = 19.65 based on packet size = 11Kbits, RTT = 563.74msec, and loss = 1.0E-6

The theoretical network limit is 19.65 Mbps

The NDT server has a 101.0 KByte buffer which limits the throughput to 1.39 Mbps

Your PC/Workstation has a 15.0 KByte buffer which limits the throughput to 0.21 Mbps. The network based flow control limits the throughput to 0.23 Mbps"

Your RTT is rather high. The usual value for the US is 150-250 ms.

Something in your signal line or modem/router is adding to the delay.

Check for possible electromagnetic interference (EMI) on your line or modem/router by other electrical devices, such as sound speakers, cordless phone, TV set, etc.

Keep your modem and router a few feet apart. Are you on wireless?

Carry out this network diagnostic test and post all results, including the Statistics and More Details button below the test box:

http://nitro.ucsc.edu/

Do your speedtests with anitvirus and firewall turn off. Post your results.

project51, perhaps you can guide atlantian to adjust MTU value in his modem.

Do you know his ISP's advertised download and upload speed for this package?

You can use the feature in TCP Optimizer to locate your largest MTU.

Open TCP Optimizer, set MTU to 1500, click 'Largest MTU', then enter a any website address and click 'Start'. Your comp will send out pings and establish your system's largest MTU value.

If your largest MTU value is more than 1440 we can make a ccs file for you following this value.

Opera

What Little Bear? Looks to me like an overgrown deformed penguin. It has the same colour, no?

Bye

Check with the modem maker's website for latest driver updates.