100 Mbps / Rwin problem - please help!

[fever78]

Hi Guys,

I use an 100 Mbps broadband connection since a couple of days.

The RWIN settings calculated by 2162500 but after the manual RWIN entry and reboot I got all settings without save.

My current settings are:

Bandwith 100 Mbps
x Delay 173 ms
= Rwin/BDP 2162500 bytes

After the PC reboot and settings save I got the following result from the TCP/IP Analyzer:

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2012.01.03 12:43
IP address: 178.27.xx.xxx
Client OS/browser: Windows 7 (Firefox 9.0.1)

TCP options string: 020405b4010303020402080a000441fc00000000
MSS: 1460
MTU: 1500
TCP Window: 66608 (NOT multiple of MSS)
RWIN Scaling: 2 bits (2^2=4)
Unscaled RWIN : 16652
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 2664kbps (333KBytes/s)
BDP limit (500ms): 1066kbps (133KBytes/s)
MTU Discovery: ON
TTL: 50
Timestamps: ON
SACKs: ON
IP ToS: 00000000 (0)

My RWIN 2162500 settings won't save and I got always the above - can you help please?

Thanks / Regards
fever78

[RaisinCain]

If you're running Windows 7 just leave it. Do a speed test and post the results. TTL should be at least 64. Also turn off Timestamps and SACKS. Everything else seems fine.

[fever78]

Thank you for you nice reply. Flo

[ITALIAN_GUY_20]

Hello there fever78

Firstly,

Download Cablenut

http://www.broadbandnuts.com/

Open it and pop it to windows 2000

Then pop in these settings.

DefaultReceiveWindow = 1027840
DefaultSendWindow = 65535
DisableAddressSharing = 1
InitialLargeBufferCount = 200
InitialMediumBufferCount = 480
InitialSmallBufferCount = 640
LargeBufferSize = 819200
MaxFastTransmit = 64000
MediumBufferSize = 150400
Priority Boost = 0
SmallBufferSize = 12800
TransmitWorker = 32
FastSendDatagramThreshhold = 4096
EnableFastRouteLookup = 1
EnablePMTUDiscovery = 1
IgnorePushBitsOnReceives = 0
GlobalMaxTcpWindowSize = 1027840
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 1
TcpLogLevel = 1
TcpMaxDupAttacks = 2
TcpMaxHalfOpen = 100
TcpMaxHalfOpenRetired = 80
TcpRecvSegmentSize = 1460
TcpSendSegmentSize = 1460
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 1027840
MaxConnectionsPer1_0Server = 999999999
MaxConnectionsPerServer = 999999999
DefaultTimeToLive = 64
DefaultUserTOSSetting = 0
TcpMaxDataRetransmissions = 7
DefaultTOSValue = 240

Save and your good to go.

[Zwerg]

Hello!
First excuse my worse english........thx

I have the same problem with Cable 100 MBit/s and I tried the option writen by ITALIAN_GUY_20, but the RWIN didn't change. Bevor that I worked some hours with netsh from "Windows 7, Vista, 2008 Tweaks" but no result.....
My Results from the Analyzer:

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2012.03.05 16:18
IP address: 78.42.xx.xx
Client OS/browser: Windows 7 (Firefox 10.0.2)

TCP options string: 020405b40103030201010402
MSS: 1460
MTU: 1500
TCP Window: 65700 (multiple of MSS)
RWIN Scaling: 2 bits (2^2=4)
Unscaled RWIN : 16425
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 2628kbps (329KBytes/s)
BDP limit (500ms): 1051kbps (131KBytes/s)
MTU Discovery: ON
TTL: 47
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

SG Speed Test Results:

« SpeedGuide.net Speed Test Results »
20435 kbps down (~20.44 Mbps, 2495 KB/s)↓
2444 kbps up (~2.44 Mbps, 298 KB/s)↑
10240 KB downloaded in 4.105 seconds
5120 KB uploaded in 17.159 seconds
Tested on: 2012.03.05 16:21 EST
Tested from: dagobah.biz
Test Link: http://www.speedguide.net/speedtest/...p?test=3598738
Provider: kabel-badenwuerttemberg.de
Location: Offenburg, DE

Can anyone help me?

regards Zwerg

[ITALIAN_GUY_20]

Hello there Zerg,

Windows 7 is self tuning, so what you get is what you get.

Just pop in all the settings that I will supply you below.

Download a program called TCP Optimizer.

You can download it from here.

http://www.speedguide.net/downloads.php

Once you have downloaded it, open it up and follow these settings below.

General Settings:

Click Custom down the bottom of the program.

1/ Slide the slider all the way to 100+ Mbps.
2/ Check the option Modify All Network Adapters.
3/ MTU 1500.
4/ TCP Windows Auto-Tuning - Normal.
5/ Congestion Control Provider - CTCP.
6/ TCP Chimney Offload - Enabled.
7/ Receive-Side Scaling State - Enabled.
8/ Direct Cache Access (DCA) - Enabled.
9/ NetDMA (TCPA) - Enabled.
10/ Time to Live (TTL) - 64.
11/ ECN Capability - Disabled.
12/ Windows Scaling Heuristics - Disabled.
13/ Chechsum Offloading - Enabled.
14/ Check Windows Scaling.

Advanced Settings (next column)

15/ MaxConnectionsPerServer - 255.
16/ MaxConnectionsPer1_0Server - 255.
17/ LocalPriority - 4.
18/ HostPriority - 5.
19/ DnsPriority - 6.
20/ NetbtPriority - 7
21/ SynattackProtect - Enabled 1.
22/ TcpMaxDataRetransmission - 7
23/ LargeSystemCache - enabled 1
24/ Size - Optimized 3.
25/ QoS: NonBestEffortLimit - 0.
26/ NetworkThrottlingIndex - Disabled: ffffff.
27/ TcpAckFrequency - Enabled 1.
28/ TCPNoDelay - enabled 1.
29/ TcpDelackTicks - Disabled.
30/ NegativeCacheTime - 0.
31/ NetFailureCacheTime - 0.
32/ NegativeSOACacheTime - 0.
33/ MaxUserPort - 65534.
34/ TcpTimedwaitDelay - 30.

Click Apply Changes.

And click OK to save settings

Then click no since you don't want to restart yet.

Next....

Download a program called Cablenut.

You can download it from here.

http://www.broadbandnuts.com/

Once you have downloaded it, open it up and click windows 2000, (Don't worry)

Then once you have done that, pop in these settings in the appropriate box.

DefaultReceiveWindow = 1027840
DefaultSendWindow = 65535
DisableAddressSharing = 1
InitialLargeBufferCount = 200
InitialMediumBufferCount = 480
InitialSmallBufferCount = 640
LargeBufferSize = 819200
MaxFastTransmit = 64000
MediumBufferSize = 150400
Priority Boost = 0
SmallBufferSize = 12800
TransmitWorker = 32
FastSendDatagramThreshhold = 4096
EnableFastRouteLookup = 1
EnablePMTUDiscovery = 1
IgnorePushBitsOnReceives = 0
GlobalMaxTcpWindowSize = 1027840
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 1
TcpLogLevel = 1
TcpMaxDupAttacks = 2
TcpMaxHalfOpen = 100
TcpMaxHalfOpenRetired = 80
TcpRecvSegmentSize = 1460
TcpSendSegmentSize = 1460
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 1027840
MaxConnectionsPer1_0Server = 999999999
MaxConnectionsPerServer = 999999999
DefaultTimeToLive = 64
DefaultUserTOSSetting = 0
TcpMaxDataRetransmissions = 7
DefaultTOSValue = 240

Once finished, click save to Registry, then click exit.

Next...

Go into your network adapter.

Click Start -> Control Panel -> Network and Sharing Centre -> Change adapter settings -> Right click on Local Area Connection and go to properties.

Uncheck Internet protocol Version 6 (TCP/IPv6)

Click Configure.

Click Advanced tab.

Now follow the settings below.

Auto Disable Gigabit - Disabled.
Flow Control - Disabled.
Green Ethernet - Enabled.
Interrupt Moderation - Disabled.
IPv4 Checksum Offload - Rx & Tx Enabled.
Jumbo Frame - Disabled.
Large Send Offload v2 (IPv4) - Enabled.
Large Send Offload v2 (IPv6) - Disabled.
Network Address - Leave it has it is.
Priority & VLAN - Priority & VLAN Enabled
Receive Buffers - Whatever is max for you.
Receive Side Scaling - Enabled.
Shutdown Wake-On-Lan - Disabled.
Speed & Duplex - 1.0 Gbps Full Duplex or 100 Mbps Full Duplex (if not).
TCP Checksum Offload (IPv4) - Rx & Tx Enabled.
TCP Checksum Offload (IPv6) - Disabled.
Transmit Buffers - Whatever is max for you.
UDP Checksum Offload (IPv4) - Rx & Tx Enabled.
UDP Checksum Offload (IPv6) - Disabled.
Wake on Magic Packet - Disabled.
Wake on pattern match - Disabled.
WOL & Shutdown Link Speed - Not Speed Down.

Restart your computer and your finished tweaking your machine.

Regards,

Luca.

[Zwerg]

@Luca Thanks for your interest an help! Sadly it doesn't work anyway.
Info: Win7 64x, 100Mps, Delay: 20-169ms, Average: 92ms= RWIN 1150000
I modified all you postet here but some values didn't chance, they reset itself:
In TCP Optimizer: TcpDelackTicks= sets automatically to default n/a

NetworkAdapter: only 17 (instead 22) Values available, no entry:
Green Ethernet
Large Send Offload v2 (IPv6)
Receive Side Scaling
TCP Checksum Offload (IPv6)
UDP Checksum Offload (IPv6)
-For the Buffers I tokk 512/128-
I executed the progs as an admin.

It's enough to drive a person mad. I tried it 5 timies..... Is it possible that the 64x is the problem? Are there any options?
Thanks!
Zwerg

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2012.03.06 13:43
IP address: 78.42.xx.xx
Client OS/browser: Windows 7 (Firefox 10.0.2)

TCP options string: 020405b40103030201010402
MSS: 1460
MTU: 1500
TCP Window: 65700 (multiple of MSS)
RWIN Scaling: 2 bits (2^2=4)
Unscaled RWIN : 16425
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 2628kbps (329KBytes/s)
BDP limit (500ms): 1051kbps (131KBytes/s)
MTU Discovery: ON
TTL: 47
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

« SpeedGuide.net Speed Test Results »
21318 kbps down (~21.32 Mbps, 2602 KB/s)↓
2440 kbps up (~2.44 Mbps, 298 KB/s)↑
10240 KB downloaded in 3.935 seconds
5120 KB uploaded in 17.188 seconds
Tested on: 2012.03.06 13:46 EST
Tested from: dagobah.biz
Test Link: http://www.speedguide.net/speedtest/...p?test=3599463
Provider: kabel-badenwuerttemberg.de
Location: Offenburg, DE

[RaisinCain]

Hello there Zerg,

Windows 7 is self tuning, so what you get is what you get.

Just pop in all the settings that I will supply you below.

Download a program called TCP Optimizer.

You can download it from here.

http://www.speedguide.net/downloads.php

Once you have downloaded it, open it up and follow these settings below.

General Settings:

Click Custom down the bottom of the program.

1/ Slide the slider all the way to 100+ Mbps.
2/ Check the option Modify All Network Adapters.
3/ MTU 1500.
4/ TCP Windows Auto-Tuning - Normal.
5/ Congestion Control Provider - CTCP.
6/ TCP Chimney Offload - Enabled.
7/ Receive-Side Scaling State - Enabled.
8/ Direct Cache Access (DCA) - Enabled.
9/ NetDMA (TCPA) - Enabled.
10/ Time to Live (TTL) - 64.
11/ ECN Capability - Disabled.
12/ Windows Scaling Heuristics - Disabled.
13/ Chechsum Offloading - Enabled.
14/ Check Windows Scaling.

Advanced Settings (next column)

15/ MaxConnectionsPerServer - 255.
16/ MaxConnectionsPer1_0Server - 255.
17/ LocalPriority - 4.
18/ HostPriority - 5.
19/ DnsPriority - 6.
20/ NetbtPriority - 7
21/ SynattackProtect - Enabled 1.
22/ TcpMaxDataRetransmission - 7
23/ LargeSystemCache - enabled 1
24/ Size - Optimized 3.
25/ QoS: NonBestEffortLimit - 0.
26/ NetworkThrottlingIndex - Disabled: ffffff.
27/ TcpAckFrequency - Enabled 1.
28/ TCPNoDelay - enabled 1.
29/ TcpDelackTicks - Disabled.
30/ NegativeCacheTime - 0.
31/ NetFailureCacheTime - 0.
32/ NegativeSOACacheTime - 0.
33/ MaxUserPort - 65534.
34/ TcpTimedwaitDelay - 30.

Click Apply Changes.

And click OK to save settings

Then click no since you don't want to restart yet.

Next....

Download a program called Cablenut.

You can download it from here.

http://www.broadbandnuts.com/

Once you have downloaded it, open it up and click windows 2000, (Don't worry)

Then once you have done that, pop in these settings in the appropriate box.

DefaultReceiveWindow = 1027840
DefaultSendWindow = 65535
DisableAddressSharing = 1
InitialLargeBufferCount = 200
InitialMediumBufferCount = 480
InitialSmallBufferCount = 640
LargeBufferSize = 819200
MaxFastTransmit = 64000
MediumBufferSize = 150400
Priority Boost = 0
SmallBufferSize = 12800
TransmitWorker = 32
FastSendDatagramThreshhold = 4096
EnableFastRouteLookup = 1
EnablePMTUDiscovery = 1
IgnorePushBitsOnReceives = 0
GlobalMaxTcpWindowSize = 1027840
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 1
TcpLogLevel = 1
TcpMaxDupAttacks = 2
TcpMaxHalfOpen = 100
TcpMaxHalfOpenRetired = 80
TcpRecvSegmentSize = 1460
TcpSendSegmentSize = 1460
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 1027840
MaxConnectionsPer1_0Server = 999999999
MaxConnectionsPerServer = 999999999
DefaultTimeToLive = 64
DefaultUserTOSSetting = 0
TcpMaxDataRetransmissions = 7
DefaultTOSValue = 240

Once finished, click save to Registry, then click exit.

Next...

Go into your network adapter.

Click Start -> Control Panel -> Network and Sharing Centre -> Change adapter settings -> Right click on Local Area Connection and go to properties.

Uncheck Internet protocol Version 6 (TCP/IPv6)

Click Configure.

Click Advanced tab.

Now follow the settings below.

Auto Disable Gigabit - Disabled.
Flow Control - Disabled.
Green Ethernet - Enabled.
Interrupt Moderation - Disabled.
IPv4 Checksum Offload - Rx & Tx Enabled.
Jumbo Frame - Disabled.
Large Send Offload v2 (IPv4) - Enabled.
Large Send Offload v2 (IPv6) - Disabled.
Network Address - Leave it has it is.
Priority & VLAN - Priority & VLAN Enabled
Receive Buffers - Whatever is max for you.
Receive Side Scaling - Enabled.
Shutdown Wake-On-Lan - Disabled.
Speed & Duplex - 1.0 Gbps Full Duplex or 100 Mbps Full Duplex (if not).
TCP Checksum Offload (IPv4) - Rx & Tx Enabled.
TCP Checksum Offload (IPv6) - Disabled.
Transmit Buffers - Whatever is max for you.
UDP Checksum Offload (IPv4) - Rx & Tx Enabled.
UDP Checksum Offload (IPv6) - Disabled.
Wake on Magic Packet - Disabled.
Wake on pattern match - Disabled.
WOL & Shutdown Link Speed - Not Speed Down.

Restart your computer and your finished tweaking your machine.

Regards,

Luca.

Promote cablenut and then tcp optimizer? Quit spreading the FUD. If you're running 7 then don't bother. Both programs will only screw up the connection only worse.