trogers

We shall check the state of your network. Do this network diagnostic test and post all results including STATISTICS and MORE DETAILS: http://nitro.ucsc.edu/

You may be having electromagnetic interference affecting your signal lines or devices. First, make sure you keep your router and modem a few feet apart. They have been known to affect each other. Then redo your speedtests again.

Go to www.cablenut.com and download the Cablenut Adjuster program. Use this program to open the ccs file attached below. Then, click 'Save to Registry', exit and reboot your comp. Do your speedtests again to compare before and after speed results.

Just click on this link and a new page will appear. Copy the whole page (enclosed in white) and paste it to the message box of this forum: https://www.speedguide.net/analyzer.php

Carry out tests in the following links and post your results. With the info, we can know how to help you: Speedtests at www.testmy.net using the largest file 2992 KB https://www.speedguide.net/analyzer.php http://nitro.ucsc.edu/

Basically, some Nic and some brands or models of modem do not work well together. Setting the Nic to 'auto' is of course the first correct choice. It is when 'auto' does not work 100% of the time, we try to match half-duplex with half duplex or full duplex with full duplex. And when this also does not work, you have to change either the Nic or the modem. What do you think the ISP tech will recommend to change? Who supplied you the modem? If it is still under warranty, should you not get a replacement for free?

To sum up what it all means: Combining multiple lines of dial-up increases bandwidth or the data carrying capacity per second. Even if we can combine lines to achieve a bandwidth of say 560 Kbps it will be slower than a DSL of the same bandwidth because dial-up has a higher device latency. Adding to this, the article in the link was trying to make consumers aware that manufacturers often boast about capacities of their devices but do not advertise on the performance of these devices with respect to latency. So if I am to choose among routers or among modems of the same capacity, I should choose one with the least device latency.

With Nic set to 'auto' do you still have your signals jumpy or suffer periodic disconnections? If so, your ISP tech is doing a good job for his company by not needing to send you a new modem free of charge...leaving you with inconsistent speeds and cutoffs. Do your nitro test and post the full report. If this problem is not solved, TCP Optimizer and Cablenut cannot help.

Cablenut reaches deep into the bowels of your CPU and tweaks your Windows Registry.

Yes TCP Optimizer and Cablenut can work together. I personally use TCP Optimizer as first tweak as it can modify network adapters and MTU values plus a few extra registry values. Then I use Cablenut to fine tune. As for your case, you have to first solve a mismatch of duplex problem between your Nic or router (if any) and your modem. "Alarm: Duplex mismatch condition found: Host set to Full and Switch set to Half duplexD" Here is a link with suggestions to rectify this problem: http://homepage.ntlworld.com/robin.d.h.walker/cmtips/ethernet.html#ethernet When you have matched duplex setting, do the speedtests and nitro test again to check.

We cannot tweak just upload without tweaking download. Sometimes, download speed will decrease slightly when upload speed is raise. This is natural because if traffic is flowing out fully from your comp, no packet received signals can be sent out to servers, affecting download signals. You can see this by testing both upload and download at the same time.

Hey guys, here is part of that link illustrating what you are trying to understand: Part of the problem here is misleading use of the word "faster". Would you say that a Boeing 747 is three times "faster" than a Boeing 737? Of course not. They both cruise at around 500 miles per hour. The difference is that the 747 carries 500 passengers where as the 737 only carries 150. The Boeing 747 is three times bigger than the Boeing 737, not faster. Now, if you wanted to go from New York to London, the Boeing 747 is not going to get you there three times faster. It will take just as long as the 737. In fact, if you were really in a hurry to get to London quickly, you'd take Concorde, which cruises around 1350 miles per hour. It only seats 100 passengers though, so it's actually the smallest of the three. Size and speed are not the same thing. On the other hand, If you had to transport 1500 people and you only had one aeroplane to do it, the 747 could do it in three trips where the 737 would take ten, so you might say the Boeing 747 can transport large numbers of people three times faster than a Boeing 737, but you would never say that a Boeing 747 is three times faster than a Boeing 737. That's the problem with communications devices today. Manufacturers say "speed" when they mean "capacity".

What are the speeds you are paying your ISP to give you? One test result stands out to be very abnormal: your latency ( RTT = 1514.31msec) Usually, I would look for possible electromagnetic interference affecting your modem/router or signal line connections. Read these links and see if you have similar causes: http://www.testmy.net/forum/index.php?topic=11588.0 https://www.speedguide.net/read_articles.php?id=1885 https://www.speedguide.net/read_articles.php?id=117 A cordless phone set or electric guitar near your signal devices is also a main cause.

You can do your nitro test again and check if there is still a duplex mismatch. To check if your speed is optimum, do testing when network traffic is low, probably 2-6 am period.

Windows sets RWIN to a default value of 17520 Kbytes and it has a function that can negotiate and adjust RWIN value to a max of just over 64000 Kbytes. This is ok if our subscribed bandwidths are not much higher than 2 Mbps and latency not exceeding 300 ms. Occasionally, some problems may occur when the negotiations and auto adjustments fail. But for bandwidths of 3 Mbps and more, optimum throughput can never be achieved. If say, your subscribed bandwidth is 6 Mbps, you will unlikely to achieve even half that bandwidth with Windows default. Using the RWIN formula, RWIN = bandwidth x latency divided by 8 (bit) = ________ Kbytes So if RWIN = 65000 and latency is 200 ms Bandwidth = 65000 x 8 / 200 = 2600 Kbps This is why we need to tweak to get optimum throughput and speed.

To properly select values to be use with Cablenut Adjuster, you need to understand about MTU values, latency, Tcp Stack function and buffer size (RWIN). Speed test only shows the end result, but network diagnostic test shows how the signal is processed and highlight the problem areas. The test showed your problem is an undersized buffer which set your bandwidth limit to 1.14 Mbps. Like a small doorway for Jack's giant...(smile).

This is the reason for your slowspeed: "Your PC/Workstation has a 8.0 KByte buffer which limits the throughput to 1.14 Mbps The network based flow control limits the throughput to 1.33 Mb." Try this ccs file with a 124 Kbyte buffer.

From this test, 2 items are limiting your speed: "The slowest link in the end-to-end path is a 10 Mbps Ethernet subnet Alarm: Duplex mismatch condition exists: Host set to Full and Switch set to Half duplex" "The NDT server has a 8192.0 KByte buffer which limits the throughput to 404.50 Mbps. Your PC/Workstation has a 250.0 KByte buffer which limits the throughput to 12.39 Mbps. The network based flow control limits the throughput to 5.98 Mbps." There is a mismatch in duplex setting between your Nic or router (if any) and your modem. Read this link on suggestions to rectify: http://homepage.ntlworld.com/robin.d.h.walker/cmtips/ethernet.html#ethernet Traffic in your ISP network is only giving you a bandwidth just under 6 Mbps at the moment. Your PC has been set to a bandwidth limit of just over 12 Mbps, which is adequate for your subscribed speed. So you are limited by some heavy ISP traffic.

Actually, DefaultWindowSize of 513920 for you is over provided. A 256960 is normally adequate. I gather this opinion from your test results as follows: "The NDT server has a 8192.0 KByte buffer which limits the throughput to 452.96 Mbps. Your PC/Workstation has a 250.0 KByte buffer which limits the throughput to 13.87 Mbps. The network based flow control limits the throughput to 13.95 Mbps" Your PC and the network throughput limits are in balance and both values not higher by much from your subscribed speed. Thus a Tcp buffer (RWIN) of 250 KBytes is adequate. But another part of your test made one significant comment: "There were 78 packets retransmitted, 7 duplicate acks received, and 88 SACK blocks received The connection was idle 0 seconds (0%) of the time This connection is network limited 99.22% of the time." You have quite a high retransmission rate by percentage and something in the network is limiting your speed by 99% of the time." In many such cases, I will first look for line quality problem or electromagnetic interference on the signal processing devices - modem and router. Here are some interesting links of other people's experiences: http://www.testmy.net/forum/index.php?topic=11588.0 https://www.speedguide.net/read_articles.php?id=1885 https://www.speedguide.net/read_articles.php?id=117

Try with doubling your DefaultReceiveWindow to 513920.

Perhaps something in the network or line is limiting your speed. Do a network diagnostic test here and post all results including the 'Statistics' and 'More Details': http://nitro.ucsc.edu/ One question - Are you located in Europe?

Hi jackyandjoe, You an use the ccs file I posted in: http://www.testmy.net/forum/index.php?topic=11777.0

Ok. I got them from the series of numbers you have posted. Here is my ccs file for 10 Mbps - MTU 1500.

Open your ccs file and post the values of DefaultSendWindow - GlobalMaxTcpWindowSize - TcpWindowSize -

If you modem and router are close to each other, place them a few feet apart. Then, test your speeds again.