Need some advice from the gods ;)

axdenied · Post by **axdenied** » Sat Sep 06, 2003 8:24 pm

Hello everyone,

I am not able to reach my cap on one my computers. Here is the config:

1) ISP: Videotron montreal
2) CAPS: 4Mbits/640Kbps
3) Wireless router connected to the modem, my computer has a wireless usb.
4) I have windows XP
5) Used Adware and Spyware ( I am clean, woohoo !!!)
6) I notice that If I download from internet explorer I can sometime reach my cap, however it's really slow by FTP (any FTP).

Thanks for any input guys.

TCP Analyser:

TCP options string = 020405b401010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 49640
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 49640

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 1985.6 kbps (248.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 794.24 kbps (99.28 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 51 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 01011100

Precedence (priority) = 100 (flash override)
Delay = 1 (low delay)
Throughput = 1 (high throughput)
Reliability = 0 (normal reliability)
Cost = 1 (low cost)

mccoffee · Post by **mccoffee** » Sat Sep 06, 2003 8:32 pm

Try the following in cablenut which is below me to download and install.

DefaultReceiveWindow = 512000
DefaultSendWindow =62208
DisableAddressSharing = 1
InitialLargeBufferCount = 100
InitialMediumBufferCount = 240
InitialSmallBufferCount = 320
LargeBufferSize = 81920
MaxFastTransmit = 64000
MediumBufferSize = 15040
PriorityBoost = 0
SmallBufferSize = 1280
TransmitWorker = 32
FastSendDatagramThreshold = 4096
EnableFastRouteLookup = 1
EnablePMTUDiscovery = 1
IgnorePushBitOnReceives = 0
GlobalMaxTcpWindowSize = 102200
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 1
TcpLogLevel = 1
TcpMaxDupAcks = 3
TcpMaxHalfOpen = 100
TcpMaxHalfOpenRetried = 80
TcpRecvSegmentSize = 1460
TcpSendSegmentSize = 1460
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize =102200
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 92

axdenied · Post by **axdenied** » Sat Sep 06, 2003 9:45 pm

Thanks for the settings mccoffee.
I tried them but it didn't improve my download speed, I am still at 170kbps.

Do you think there is a special tweak for wireless connections ? My computer that is connect by an rj45 cable can reach the cap, but not the wireless. I am not too far from the router and even If I put the two computers near each other there is no difference.

Any help ?

Thanks.

mnosteele52 · Post by **mnosteele52** » Sun Sep 07, 2003 8:24 am

axdenied try the folowing settings and see if they help:

DefaultReceiveWindow = 512000
DefaultSendWindow = 81920
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 = 64240
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 0
TcpLogLevel = 1
TcpMaxDupAcks = 3
TcpMaxHalfOpen = 100
TcpMaxHalfRetried = 80
TcpRecvSegmentSize = 1460
TcpSendSegmentSize = 1460
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 64240
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 240

mccoffee · Post by **mccoffee** » Sun Sep 07, 2003 10:24 am

Do you have the lastest firmware on router also did you manually assign ip?? Also if there is a setting like block wan ping make sure you have ping going through the router.

axdenied · Post by **axdenied** » Sun Sep 07, 2003 11:26 am

Thanks a lot
mnosteele52 and mccoffee !

Your new cablenut settings mnosteele52 increased my speed from 170K/s to 270K/S. Is there a way to increase it a little more to reach my cap of 512 ? or is this the limit of my 802.11b wireless adapter.

mccoffee, can you tell me why accepting wan ping can improve the speed ?

Thanks guys, I knew I would find answers here

mnosteele52 · Post by **mnosteele52** » Sun Sep 07, 2003 4:56 pm

I would suggest finding your own value using the instructions in my help & tips link, that is alyways the best way.

mccoffee · Post by **mccoffee** » Mon Sep 08, 2003 12:41 am

Ok with ping you do want some ping to get through especially on large file downloads.