Connection slows down.....

[Tobbas]

Hi there, i try to make it short :-)

Question:

Is it possible, that my DSL Connection slows down due to many users using the same type of DSL (same product, same isp) in my town? (The routers and Gateways to the destination are not overloaded and the response time to each hop is the same as it is when i have normal speed).

Problem:

Sometimes (2 to 3 times a day) my DSL Connection (1500 / 256) slows down (700 - 800 / 256). I must power cycle my modem 2 - 3 times to get full speed again. My ISP says that the distance from my modem to their port is to long (5.3 km) and they can do nothing about it, because i will always have this problem when too many users are connected to their systems in my town. I cant believe that. IMHO, if thats the problem my speed must be permanent around 700-800 / 256 right?!? In addition the speed is stable for a couple of hours - even in rush hours.

So,.. i dont know what they are talking about. My understanding of a DSL-Connection is that - if everything goes right with all the routers to the destination - i dont have to share bandwidth with anyone. (Please correct me if im wrong).


Thanks for any idea...

bye
Tobbas

[j79zlr]

DSL is a dedicated line to the DSLAM where everyone is connected at the CO. So you only have a dedicated line to your local switching station and if too many people are logged on at once, you can experience a slowdown. I have had cable and currrently using DSL, and I can say that this is much more rare with DSL than cable, at least in my own experience. My speeds are the same at any point in the day I test it.

[Tobbas]

yes,.. exactly. Thats what im trying to say :-)).

So you think that the DSLAM is the bottleneck in this case, not the line to it...

[mnosteele52]

Hi Tobbas:D, have you tweaked your connection? You shouldn't see that much of a slowdown, but you are in Germany and things could be setup a bit different there?

:cool:

[Tobbas]

Hi mnosteele52:D ,

hmm... yes, i tweaked my connection. But things like MTU, MSS or TCP Receive Window should be the same all over the world.... also in germany :p .

I assume that one or more Ports in the DSLAM are makeing this trouble. Could this be? I dont think that the line is too long, because earlier this year i've had a 2,3 MBit SDSL Line there...

what do you think...

[Tobbas]

TCP options string = 020405ac0103030201010402
MTU = 1492
MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1452
MSS is optimized for PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput.

Default Receive Window (RWIN) = 255552
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 63888

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
511104 (MSS x 44 * scale factor of 8)
127776 (MSS x 44 * scale factor of 2)
63888 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 10222.08 kbps (1277.76 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4088.832 kbps (511.104 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 59 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000



Maybe anyone have some suggestions.... :rolleyes:

[mnosteele52]

OK try the following, first download CableNut from my signature then use the following settings:

DefaultReceiveWindow = 192000
DefaultSendWindow = 32786
DisableAddressSharing = 1
InitialLargeBufferCount = 200
InitialMediumBufferCount = 480
InitialSmallBufferCount = 640
LargeBufferSize = 819200
MaxFastTransmit = 64000
MediumBufferSize = 150400
PriorityBoost = 0
SmallBufferSize = 12800
TransmitWorker = 32
FastSendDatagramThreshold = 4096
EnableFastRouteLookup = 1
EnablePMTUDiscovery = 1
IgnorePushBitsOnReceive = 0
GlobalMaxTcpWindowSize = 63888
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 0
TcpLogLevel = 1
TcpMaxDupAcks = 3
TcpMaxHalfOpen = 100
TcpMaxHalfRetried = 80
TcpRecvSegmentSize = 1452
TcpSendSegmentSize = 1452
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 63888
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 90

VERY IMPORTANT TO DO THE FOLLOWING

1. Under your LAN connection - properties - general tab, uninstall all the protocols there that you do not need.

2. Open IE and select tools - internet options - connections - LAN settings, make sure NOTHING there is checked.

3. Make sure you have the latest drivers for your NIC from the manufacturer. Set your NIC duplex mode to 10mb half duplex for Cable, for DSL it is ISP dependent unless you are using a router, if so then set it to 100mb full duplex for both Cable & DSL (the instructions are in my Help & Tips link (http://forums.speedguide.net/showthread.php?s=&threadid=73799)). If you are using a router make sure you have the latest firmware.

4. Clear your temporary internet files.

5. Power cycle your modem, unplug it for atleast 15 seconds.

6. Download and update then do a scan with SpyBot 1.2 (http://beam.to/spybotsd) & Ad Aware 6.0 (http://www.lavasoftusa.com/support/download) to remove any spyware then install and update SpywareBlaster (http://www.wilderssecurity.com/spywareblaster.html) to stay spyware FREE. YOU MUST USE BOTH AD AWARE & SPYBOT TO ENSURE YOU ARE SPYWARE FREE SINCE ONE FINDS WHAT THE OTHER MISSES.

7. Make sure you do the faster web page tweak in my Help & Tips link (http://forums.speedguide.net/showthread.php?s=&threadid=73799).

Also make sure you don't have any halogen lamps or 900mhz and 2.4ghz phones in the same room as your modem.

You may also want to check out the DSL Wiring Guide (http://www.dslnuts.com/DSLwiring.shtml) for possibly increasing your DSL speed.

P.S. My girlfriend is part German and speaks it fluently, her sister is there is Germany right now visiting their grandmother.:cool:

:D :cool:

[Tobbas]

TCP options string = 020405ac01010402
MTU = 1492
MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1452
MSS is optimized for PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput.

Default Receive Window (RWIN) = 63888
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 63888

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
511104 (MSS x 44 * scale factor of 8)
255552 (MSS x 44 * scale factor of 4)
127776 (MSS x 44 * scale factor of 2)
bandwidth * delay product:

Your RcvWindow limits you to: 2555.52 kbps (319.44 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1022.208 kbps (127.776 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 59 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 01011010

Precedence (priority) = 010 (immediate)
Delay = 1 (low delay)
Throughput = 1 (high throughput)
Reliability = 0 (normal reliability)
Cost = 1 (low cost)


Everything's done! :D

[mnosteele52]

Your settings look more optimized for your connection:D, hopefully your speed has improved.

:cool:

[Tobbas]

hopefully :p, but i think to get a solution for my slowdown-prob i have to change the ISP...

So.. thanks a lot man and have a nice day. :D


cu soon
Tobbas