Raise My Mtu

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 12:12 pm

Is there any way i can raise my MTU up to 1492.... because i heard it from this website..
http://dslnuts.com/pppoe.shtml
it said that i can raise my MTU to be at 1492.. i tried raising it my self in the registry settings then i restarted my comp but in the anylizer test it show that it is still at 1480.. all i want to do is raise it up to 1492... can sumone help?

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 12:33 pm

1480 is the proper MTU for using XP's native PPPoE setup. If you want to raise it you have to use other PPPoE software to do so, if you decide to do so then you must also adjust other settings that are based on your MTU. Raising it won't increase your bandwidth.

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 12:38 pm

Okie Thnx Steel once again.....
one question though...
can u give me the URL to the site that has that lil calculator
which tells u which settings are good for Cablenut?

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 12:44 pm

Sure, just use the links on my site below, the Dr Tweak link.

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 1:17 pm

hey i tweaked my settings acording to the calculatar w/ Cablenuts thingy and here are the results..... also my speed it says... 400.0MPS LMAO why does it say that lol it used to say 10.0MPS....

TCP options string = 020405a001010402
MTU = 1480
MTU is optimized for Windows XP PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1440
MSS is optimized for Windows XP PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput.

Default Receive Window (RWIN) = 11520
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 11520

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
506880 (MSS x 44 * scale factor of 8)
253440 (MSS x 44 * scale factor of 4)
126720 (MSS x 44 * scale factor of 2)
63360 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 460.8 kbps (57.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 184.32 kbps (23.04 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.
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) = 01011100

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

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 1:18 pm

Did i mess up my connection?

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 1:29 pm

Your TcpWindowSize is too low, what was your max latency under a load?

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 1:48 pm

the maximum was 78Ms i pinged http://www.google.com

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 1:50 pm

That was under a load (while downloading a file) correct?

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 1:52 pm

lol i dont understand... all id did was
go to command prompt thingy the i typed..
ping http://www.google.com then it gave me ping time...oh yeah also i did another ping test to the same site http://www.google.com and my maximum ping now is.. 46ms

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 1:55 pm

Read here on how to find your maximum latency.

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 1:59 pm

ok here buddy

Tracing route to http://www.google.com [216.239.57.99]

over a maximum of 30 hops:

1 20 ms 15 ms 15 ms 67.67.145.254

2 15 ms 15 ms 15 ms dist1-vlan60.hstntx.swbell.net [151.164.11.190]

3 15 ms 15 ms 15 ms bb1-g8-0.hstntx.swbell.net [151.164.11.246]

4 15 ms 15 ms 15 ms core1-p6-1.crhstx.sbcglobal.net [151.164.188.5]

5 15 ms 15 ms 15 ms core2-p8-0.crhstx.sbcglobal.net [151.164.188.102]

6 46 ms 46 ms 46 ms core2-p3-0.crrvca.sbcglobal.net [151.164.241.126]

7 46 ms 46 ms 46 ms core1-p8-0.crrvca.sbcglobal.net [151.164.188.49]

8 62 ms 62 ms 62 ms core2-p3-0.cranca.sbcglobal.net [151.164.243.233]

9 62 ms 62 ms 46 ms core1-p8-0.cranca.sbcglobal.net [151.164.241.225]

10 62 ms 62 ms 62 ms core2-p11-0.crscca.sbcglobal.net [151.164.242.81]

11 62 ms 62 ms 62 ms core1-p8-0.crscca.sbcglobal.net [151.164.241.237]

12 62 ms 62 ms 62 ms core2-p11-0.crsfca.sbcglobal.net [151.164.242.90]

13 62 ms 62 ms 62 ms core1-p8-0.crsfca.sbcglobal.net [151.164.242.73]

14 62 ms 62 ms 78 ms bb1-p14-2.snfc21.sbcglobal.net [151.164.243.126]

15 62 ms 62 ms 62 ms bb2-p10-1.snfc21.pbi.net [64.161.124.50]

16 62 ms 77 ms 62 ms bb1-p12-0.pxpaca.sbcglobal.net [216.102.176.234]

17 77 ms 77 ms 77 ms pxni1-ve5-sbc.google.com [151.164.89.58]

18 78 ms 77 ms 77 ms 216.239.47.74

19 77 ms 62 ms 77 ms 216.239.47.30

20 77 ms 77 ms 77 ms 216.239.49.2

21 78 ms 78 ms 78 ms 216.239.57.99

Trace complete.

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 2:32 pm

What do i do next?

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 3:17 pm

Steel r u there?

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 4:17 pm

OK use the following settings in CableNut:

DefaultReceiveWindow = 192000
DefaultSendWindow = 16384
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 = 20160
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 0
TcpLogLevel = 1
TcpMaxDupAcks = 3
TcpMaxHalfOpen = 100
TcpMaxHalfRetried = 80
TcpRecvSegmentSize = 1440
TcpSendSegmentSize = 1440
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 20160
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 90

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 5:37 pm

Man steel u are so helpful

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 6:15 pm

ok Steel here are the results....... i think there is something wrong... also Please help me raise my MTU to 1492....

TCP options string = 0204059201010402
MTU = 1466
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
MSS = 1426
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.

Default Receive Window (RWIN) = 20160
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 20160

For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
501952 (MSS x 44 * scale factor of 8)
250976 (MSS x 44 * scale factor of 4)
125488 (MSS x 44 * scale factor of 2)
62744 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 806.4 kbps (100.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 322.56 kbps (40.32 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) = 01011010

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

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 6:31 pm

OK what did you do to lower your MTU? It was 1480 like it should be. Change whatever you did.

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 6:43 pm

lol steel u must have given me the wrong settings cuz i went to the cable nut calculator then i put in my down/up in caps and my latency(Tracert while downloading a file) then i calculated it and then it gave me the settings to put in the cable nut and here is the new anylizer test results...

TCP options string = 020405a001010402
MTU = 1480
MTU is optimized for Windows XP PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1440
MSS is optimized for Windows XP PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput.

Default Receive Window (RWIN) = 57600
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 57600

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
506880 (MSS x 44 * scale factor of 8)
253440 (MSS x 44 * scale factor of 4)
126720 (MSS x 44 * scale factor of 2)
63360 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 2304 kbps (288 KBytes/s) @ 200ms
Your RcvWindow limits you to: 921.6 kbps (115.2 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) = 01011100

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

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 6:44 pm

Did i fix my connection?

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 6:49 pm

According to the tracert you posted above the settings I gave you are perfect. What did you put in the calculator for your latency?

mccoffee · Post by **mccoffee** » Wed Jul 30, 2003 7:12 pm

Why do you want 1492 anyway 1480 does the same it doesn't really matter what mtu as long as ur in xp 1480 and 1492 is the same.

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 7:26 pm

OOoooOoohhh ok then never mind... my MTU Stays at 1480...
also for my latency i put like 384ms

OD_Hunter · Post by **OD_Hunter** » Wed Jul 30, 2003 7:27 pm

....while i was downloading a file

mnosteele52 · Post by **mnosteele52** » Wed Jul 30, 2003 8:15 pm

Was 384ms your max latency or did you just randomly choose that?

OD_Hunter · Post by **OD_Hunter** » Thu Jul 31, 2003 12:08 pm

It was my max latency out of all of my ping

mnosteele52 · Post by **mnosteele52** » Thu Jul 31, 2003 12:10 pm

OK if you want my help (and I'm very glad to help) please answer my question. When you followed the instructions in the link I gave you and you ran a tracert while downloading a file, what was your max latency?

OD_Hunter · Post by **OD_Hunter** » Thu Jul 31, 2003 6:27 pm

mnosteele52 · Post by **mnosteele52** » Thu Jul 31, 2003 8:49 pm

OK if your max latency was 384ms then use the folowing settings in CableNut:

DefaultReceiveWindow = 192000
DefaultSendWindow = 16384
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 = 72000
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 1
TcpLogLevel = 1
TcpMaxDupAcks = 3
TcpMaxHalfOpen = 100
TcpMaxHalfRetried = 80
TcpRecvSegmentSize = 1440
TcpSendSegmentSize = 1440
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 72000
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTTL = 64
DisableUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 90

OD_Hunter · Post by **OD_Hunter** » Thu Jul 31, 2003 10:45 pm