trogers

Combining multiple 56k lines will only increase throughput (capacity per sec) limits, but not speed. Here is a link to explain: http://rescomp.stanford.edu/~cheshire/rants/Latency.html

What speeds are you paying your ISP for?

Could be that your RWIN setting has been set too precised for a specfic latency value. Example using the RWIN formula RWIN = bandwidth x latency divided by 8 (bit) = ________ KBytes Say you bandwidth is 4000 Kbps and you design your ccs file for a 100 ms latency RWIN = 4000 x 100 / 8 = 50000 Everything is all balanced. You get your throughput of 4000 Mbps. If latency falls to 80 ms, your throughput goes up to 5 Mbps. What happens to your throughput when latency to a particular site is 300 ms? Bandwidth = RWIN x 8 divided by latency Bandwidth = 50000 x 8 / 300 = 1333 Kbps. (compared it to your original bandwidth 4000 Kbps) Now your download speed falls by two-third.

Which country are you in? What download and upload speeds did your ISP promised? Your MTU is 1440 which is not an optimum value. We first have to adjust your MTU to 1500. Go to this link and download the TCP Optimizer: https://www.speedguide.net/downloads.php Open the TCP Optimizer 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 Then retest with https://www.speedguide.net/analyzer.php to confirm your MTU is 1500.

Try this ccs file for MTU 1492

Do your speedtests for download and upload at www.testmy.net with the largest file 2992 KB and post. Then go to this TCP Analyzer link and post your result: https://www.speedguide.net/analyzer.php

To restore to default XP Windows registry, use TCP Optimizer. You can dowload it from this link: https://www.speedguide.net/downloads.php

Looks like your ISP's router do not respond to the ping and so the test stop without a conclusion. Looks like we have to go by the old-fashion way. call out your DOS black screen and after C: use this command ping -f -l (max value) www.testmy.net Where -l is minus small L and max value is your largest anticipated MTU value minus 28. Say you start with assumed MTU value of 1500, max value is 1500-28 = 1472 If you get a message "Packets need to be fragmented..." Then 1500 is not your largest MTU. Go on pinging with a max value less 1 until you get a proper result like "Reply from XX.XXX.XX.XXX: bytes= ______ time = _____ ms TTL= ___ The bytes value shown + 28 = your largest MTU.

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 1452 we can make a ccs file for you following this value.

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 1450 (as limited by you ISP) then we can make a ccs file for you following this value.

Is there some electrical equipment installed on the other side of the wall or perhaps your neighbour below you? If it involves neighbours, I would rather relocate my comp against the wall with a window. Then at least I am sure my comp is not affected on 3 sides.

Everything seems tip top from the cable box to your devices. What about from the ISP's Switch to your cable box? Here is an interesting story: https://www.speedguide.net/read_articles.php?id=125

In some cases of tweaking, speed would not increase much no matter how we adjust RWIN and other settings due to electrical noise affecting either the line or the switches in the modem or router themselves. See this link: https://www.speedguide.net/read_articles.php?id=1885

Go to this link and download the TCP Optimizer: https://www.speedguide.net/downloads.php Open the TCP Optimizer 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 Then retest with https://www.speedguide.net/analyzer.php to confirm your MTU has changed.

Your subscribed speed is 2 Mbps. Your present RWIN (Tcp Buffer) is set at 125 KBytes giving your PC a throughput limit of 3.5 Mbps. Your network throughput is also at 3.5 Mbps. There is a balance. If there is no core router problem, you would be near to your optimum speed. So, the problem lies with the network and not your comp setting.

Thanks cholla. PolaSeeds, the reason why it cannot work is you used a -1 (minus one) instead of a -l (minus small L).

I would place the cordless phone at the opposite wall.

Your comp setting is not the cause of this serious slowdown. Seems to me your landlord has only subscribed for a bandwidth good for a few tenants and then splitted it among the whole lot of you. No viable excuse on their part as it is so easy and convenient to increase the bandwidth by tenfold to the building within a week. I think a joint action/protest among the tenants may work wonders. If your bandwidth gets to normal, you will need to reduce your RWIN setting. It is now high enough to accept a 10 Mbps throughput.

I wouldn't tweak the comp setting if I am you. You are the 4th person from the UK asking about slowdown in speed to the US, or even within the UK. One of your core gateway router is down and is the reason for traffic congestions. See this link: http://www.internettrafficreport.com/europe.htm

estimate = 2.98 based on packet size = 11Kbits, RTT = 3734.71msec, and loss = 1.0E-6 The theoretical network limit is 2.98 Mbps The NDT server has a 8192.0 KByte buffer which limits the throughput to 17.13 Mbps Your PC/Workstation has a 250.0 KByte buffer which limits the throughput to 0.52 Mbps The network based flow control limits the throughput to 0.10 Mbps RTT = 3735 ms and network throughput limit at 0.10 Mbps? There sure is a long long signal queue at the common router. Like getting into the Super Bowl...LOL

Before moving things about, check your phone lines first. Here is a link about checking lines: http://www.dslreports.com/faq/faq/8.%20Home%20wiring In the mean time, use my ccs file - 256960-64240R.ccs in page 1 of this thread.

This other ccs file is the best I can do for you. The ping test is to see if your MTU is 1500. If it does not work, your MTU is only 1452 as imposed by your modem/router. Not a optimum value.

The theoretical network limit is 3.76 Mbps The NDT server has a 8192.0 KByte buffer which limits the throughput to 493.22 Mbps Your PC/Workstation has a 125.0 KByte buffer which limits the throughput to 7.52 Mbps The network based flow control limits the throughput to 7.55 Mbps As you can see, a RWIN (buffer) of 125 KBytes allow your comp to transmit up to 7.5 Mbps, higher than your 6.6 Mbps subscribed speed. Your erratic pings levels and your download speed caps seems to suggest that there is some kind of interference in your signals. A problem with the phone line or some other seemingly unlikely source? Last week, we had a guy here whose line was affected by his heat pump located on the other side of the wall.

Where are you located?

Use this ccs file. Make sure your modem and router are not placed next to each other but are kept separated a few feet apart. Also, ensure they and any signal cables are keep away from sound speakers, phone sets or other electrical devices that may emit electromagnetic interference to your signals.