DSL Tweaking Conundrum

[Sphynx]

While I don't have my settings with me to post (@ work), I wanted to ask about this lest I forget.

Two days ago I switched from cable to DSL...thusly I needed to re-evaluate my RWIN and MTU settings.

Usually I just tweak manually, but I decided to use SG TCP/IP Optimizer this time.

Chose PPPoE, and checked Modify All Adapters, ran the ping tests and of course ended up setting MTU to 1492. It also set my RWIN value to 255552. I applied this and verified by looking in the registry.

However, how if I click on the TCP/IP Analyzer link, the results say my MTU is 1440 and RWIN is 1400.

Service is Bellsouth. PC connected via Alcatel SpeedTouch Home (stinkin' refurb), and a Netgear RP614 router.

Any suggestions would be more than welcome :D
Again, sorry I can't post the details of my settings now, but I will when I get home.

Thanks in adv!

[mnosteele52]

Update the firmware for your router first. Also try the fixes for the proper MTU I suggest in "My Tips" and ignore what the TCP/IP Analyzer gives you for your RWIN, it misreads PPPoE connections sometimes. If you will post your OS and ISPs caps I will give you some settings to try.:)

[Sphynx]

Thanks mnosteele!

I've got the latest firmware (pretty sure).

OS is Win2k.

Honestly I haven't performed any real speed tests yet, only had the DSL account for 2 days, but the caps are 1500/256...and I estimate I've been hovering around 1200/200, more or less.


I'll take a look at "My Tips", definitely :cool:

[mnosteele52]

OK Sphynx once you get your MTU straight try the following settings in Cablenut (http://www.student.ipfw.edu/~gottjl01/files/cablenut408.exe).

DefaultReceiveWindow = 192512
DefaultSendWindow = 32768
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
IgnorePushBitsOnReceive = 0
GlobalMaxTcpWindowSize = 27360 or 37440 or 51840 or 63360
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 0
TcpLogLevel = 1
TcpMaxDupAcks = 2
TcpMaxHalfOpen = 100
TcpMaxHalfRetried = 80
TcpRecvSegmentSize = 1440
TcpSendSegmentSize = 1440
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 27360 or 37440 or 51840 or 63360
MaxConnectionsPer1_0Server = 40
MaxConnectionsPerServer = 20
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 44

Also make sure you have the BufferMultipler value, if not here is a reg file for you.

************begin copy and paste***********
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servi

ces\AFD\Parameters]
"BufferMultiplier"=dword:00000400

************end copy and paste***********

Let me know if these help any.:) :D