Author Topic: Tweaks for Comcast Blast Tier  (Read 5183 times)

Offline Rocky_Grim

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Tweaks for Comcast Blast Tier
« on: August 21, 2010, 02:31:09 pm »
I am looking for cablenut tweaks for Comcast's blast tier. This tier has speeds of 16mb/2mb, or 20mb/4mb with powerboost. I have been looking around for some tweaks for this tier level. I see there are some post here for only the performance tier. I like cablenut over TCP Optimizer due to the fact you can tweak more perameters etc. I am using TCP Optimizer now. Will I have to remove my settings from it before applying the cablenut settings? Thanks in advance fellas.

SpeedGuide.net TCP Analyzer Results
Tested on: 08.21.2010 15:18
IP address: 71.61.xxx.xxx
Client OS: Windows XP
 
TCP options string: 020405b40103030401010402
MSS: 1460
MTU: 1500
TCP Window: 1027840 (multiple of MSS)
RWIN Scaling: 4 bits (2^4=16)
Unscaled RWIN : 64240
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 41114kbps (5139KBytes/s)
BDP limit (500ms): 16445kbps (2056KBytes/s)
MTU Discovery: ON
TTL: 52
Timestamps: OFF
SACKs: ON
IP ToS: 00100000 (32)
    Precedence: 001 (priority)
    Delay: 0 (normal delay)
    Throughput: 0 (normal throughput)
    Reliability: 0 (normal reliability)
    Cost: 0 (normal cost)
    Check bit: 0 (correct)
DSCP (DiffServ): CS1 001000 (8) - class 1 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

Offline Rocky_Grim

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Re: Tweaks for Comcast Blast Tier
« Reply #1 on: August 23, 2010, 05:32:01 pm »
Should I use the same settings as the person underneath me that is on Comcast?

Offline chpalmer

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Re: Tweaks for Comcast Blast Tier
« Reply #2 on: August 24, 2010, 11:20:58 pm »

Cant hurt to try...   You can always go back to what you have now. Just save your profile and then apply the new settings...

Offline Rocky_Grim

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Re: Tweaks for Comcast Blast Tier
« Reply #3 on: August 25, 2010, 01:54:00 pm »
I have been having some serious problems with my connection with Comcast. There are issues with latency spikes and packet loss. I have talked to Comcast numerous times, and they can't seam to locate an issue. However, everyone else that has took the time to actually look into the problem agrees there are definatly some serious problems. As a last resort I contacted Netgear. They walked me throught configuring the router properly. I told them that I use the connection for browsing the internet and the xbox 360 for xbox live. They advised me to set the MTU to 1364. I thought they were out of their mind so I didn't do it. Now as a last resort I am gonna give it a whirl. Is there any down side to using a smaller MTU? Also, I have absolutely no clue what settings to use with an MTU of 1364. Can someone give me a hand?
Thanks,
Rocky

Offline chpalmer

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Re: Tweaks for Comcast Blast Tier
« Reply #4 on: August 26, 2010, 01:07:18 am »

Give this a try and see what you get...   What your describing sounds like your area has been oversold. Something the ISP doesnt usually want to disclose...

DefaultReceiveWindow = 921600
DefaultSendWindow = 256000
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 = 95328
MaxFreeTcbs = 8000
MaxHashTableSize = 16384
MaxNormLookupMemory = 5000000
SackOpts = 1
SynAttackProtect = 1
Tcp1323Opts = 1
TcpLogLevel = 1
TcpMaxDupAttacks = 3
TcpMaxHalfOpen = 100
TcpMaxHalfOpenRetired = 80
TcpRecvSegmentSize = 1324
TcpSendSegmentSize = 1324
TcpTimedWaitDelay = 30
TcpUseRFC1122UrgentPointer = 0
TcpWindowSize = 95328
MaxConnectionsPer1_0Server = 20
MaxConnectionsPerServer = 10
DefaultTimeToLive = 64
DefaultUserTOSSetting = 0
TcpMaxDataRetransmissions = 6
DefaultTOSValue = 240

Offline Rocky_Grim

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Re: Tweaks for Comcast Blast Tier
« Reply #5 on: August 26, 2010, 11:23:15 am »
Thanks I will give it a shot and see how things go.