Some Advice For My Connection

PainMantra · Post by **PainMantra** » Thu Oct 31, 2002 11:09 am

Hey there, Ok, The deal is that i moved and went with SBC Yahoo ADSL, Now my MTU can not go above 1452 with the MSS of 1412. My router is the D-Link DI-614+ 2.4GHz Wireless, with any other MTU the pages won't load. So thats the deal with that and looks like there's not much choose so i was wondering if you had any good Cablenut settings worked up for this connection? Or any other tips. Thanks for any thoughts.

TCP options string = 0204058401010402

MTU = 1452
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.

MSS = 1412
Maximum useful data in each packet = 1412, which equals MSS.
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.

Default Receive Window (RWIN) = 65535
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 65535
Note: Under Windows 9x, if you have RWIN set to any other value, and the Analyzer reports 65535 you might need to install the MS Vtcp386 fix.
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
519616 (MSS x 46 * scale factor of 8)
259808 (MSS x 46 * scale factor of 4)
129904 (MSS x 46 * scale factor of 2)
64952 (MSS x 46)

bandwidth * delay product:
Your RcvWindow limits you to: 2621.4 kbps (327.675 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 54 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 01000000
Precedence (priority) = 010 (immediate)
Delay = 0 (normal delay)
Throughput = 0 (normal throughput)
Reliability = 0 (normal reliability)
Cost = 0 (normal cost)

Here is what i have beeen working with in Cablenut.

MTU 1452
MSS 1412

DefaultReceiveWindow = 192512
DefaultSendWindow = 16384
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 = 192512
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 0
TcpLogLevel = 1
TcpMaxDupAcks = 2
TcpMaxHalfOpen = 100
TcpMaxHalfRetried = 80
TcpRecvSegmentSize = 1452
TcpSendSegmentSize = 1452
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 192512
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 92

PainMantra · Post by **PainMantra** » Thu Oct 31, 2002 11:15 am

Oh Yeah, OS is XP Pro, Caps are 1500down and 256up. Another thing is that my RWIN is always the same no matter what i change it to. Any Ideas?

mnosteele52 · Post by **mnosteele52** » Thu Oct 31, 2002 12:06 pm

OK is this Hybridmonolith? First you do need to get your MTU straight, are you using Yahoo's PPPoE software or XP's? If using XP's try the following fix from Bob:

1) Download this file http://www.carricksolutions.com/XP_MTU.reg
2) Right click the file and choose "Merge"
3) Click "Yes"
4) Go to "Start" -> Click on "Run" -> Type in "Regedt32.exe" -> Click "OK"
5) Go to this Reg Key "[HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet\ Services\NdisWan\ Parameters\Protocols\0]"
6) Double click on "Protocol MTU"
7) Click on "Decimal" -> Enter your desired value (I.E.: Anything less then 1480.) Use 1480
8) Click "OK"
9) Done!

If your not using XP's software then your MTU should be 1492, so try the fixes for your MTU in my Help & Tips link and also try uninstalling the software and reinstalling it. Once we get your MTU correct we can work on the rest of your settings.

Andrzej · Post by **Andrzej** » Fri Nov 01, 2002 7:02 am

from first post PainMantra author

1} My router is the D-Link DI-614+
so by the first change MTU to optimal setting in ROUTER.

2} PPPoE should be choose in ROUTER not in wXP

3} plain TCP/IP should be on pc NIC

4) NIC should be 100FullDuplex with router

5} ONLY from EVRY router reason
acctual CN setings will be DIFERENT
please find rules as follow:
RWIN result = of multi. * ROUTER(MTU-40)=MSS(router)
exactly for: PPPoE & routerMSS
from your ISP to your router will be PPPoE

BUT below as in commonTCP/IP
TcpRecvSegmentSize = 1460
TcpSendSegmentSize = 1460
from router to NIC will be ordinary TCP/IP

BTW your CN settings in yours post:
DefaultReceiveWindow = 192512
.....
GlobalMaxTcpWindowSize = 192512
.....
Tcp1323Opts = 0
resulted in SG TCP Analizer with
Default Receive Window (RWIN) = 65535
pay attention: with RWIN above value 65535 (as both 192512 are)
Tcp1323Opts should be =1 (with pings below 200ms)
or 2 (pings above 200ms)

PainMantra · Post by **PainMantra** » Sun Nov 03, 2002 1:57 pm

First of all, I'm using xp's PPPoE, And the thing is anytime i change my MTU in the router or in XP, pages will not load, I have connection, But the pages won't load, I've tried alot of different stuff but no luck. The CS people are a joke, I called just to see about the MTU and they had no idea. Tech Support.

what a Oxymoron. anyway thanks for the responses so far. Any other ideas are more than welcome.

mnosteele52 · Post by **mnosteele52** » Sun Nov 03, 2002 2:08 pm

Try bypassing the router and see what it says your MTU is.