Slowed conection after using TCP optimizer

Nascat · Post by **Nascat** » Thu Jul 17, 2008 7:04 pm

I have windows XPpro. Before using TCP Otimizer The speed test showed 723 up and 5023 down. This was pretty much the reading I got on ever test sever.
I tried TCP Optimizer set to optimal settings and got 2300 speed down and 683 up. I reverted the Back file
saying First spg back up and got slightly better result but very slight. The second back up did no better. Reset to windows default thru TCP opti and got 3000 down 700 up. My cable is free so I don't know the provider, but I do know it should be 768 up and 4900 or 5000 down. Its a business class cable high speed acct. with really wide band.
So I really don't know alot about Broad band but do know computers very well.
What caused such dramatic loss of speed and how do I get back to where I was?
Thanks

Nascat · Post by **Nascat** » Thu Jul 17, 2008 7:07 pm

Oh yes here is my:
« SpeedGuide.net TCP Analyzer Results »
Tested on: 07.17.2008 18:44
IP address: 67.79.xxx.xxx

TCP options string: 020405b40103030201010402
MSS: 1460
MTU: 1500
TCP Window: 256960 (multiple of MSS)
RWIN Scaling: 2
Unscaled RWIN : 64240
Reccomended RWINs: 64240, 128480, 256960, 513920
BDP limit (200ms): 10278kbps (1285KBytes/s)
BDP limit (500ms): 4111kbps (514KBytes/s)
MTU Discovery: ON
TTL: 46
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

Thanks again

Rollingstone · Post by **Rollingstone** » Fri Jul 18, 2008 2:14 am

Try the following with TCP Optimizer:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU 1500
TTL - 64
TCP Receive Window - 128480
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - check
Timestamps - uncheck

Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 1
Host Priority - 1
DNSPriority - 1
NetbtPriority - 1
Lan Browsing speedup - optimized
QoS: NonBestEffortLimit - 0
ToS: DisableUserTOSSetting - 0
ToS: DefaultTOSValue - 80
MaxNegativeCacheTtl - 0
NetFailureCacheTime - 0
NegativeSOACache Time - 0
LAN Request Buffer Size - 32768
Then select "Apply Changes" and reboot to take effect

Nascat · Post by **Nascat** » Fri Jul 18, 2008 8:00 pm

Hey Thanks. Before I got you reply I tinkered with settings and got it backup to over 5000 down and over 600 up. Then followed you advise and got:
« SpeedGuide.net Speed Test Results »
5413 kbps down (~5.41 Mbps, 661 KB/s)↓
726 kbps up (~0.73 Mbps, 89 KB/s)↑
10240 KB downloaded in 15.497 seconds
2048 KB uploaded in 23.111 seconds
Tested on: 2008.07.18 19:50 EDT
Tested from: wavewifi.net
Test Link: http://www.speedguide.net/speedtest/res ... CNHLYUOQ98
Latency: 75ms
Provider: se.biz.rr.com
Location: Lakeland, FL, US

It varies a little from from different tests.
But thanks for your help.
Like I said I really don't know the provider or for sure it's 768 up and 5460 down service
I do know its Dallas cable provider and a business class service with a pretty wide band.
Is this the best it will do?

trogers · Post by **trogers** » Fri Jul 18, 2008 10:04 pm

Nascat wrote:Like I said I really don't know the provider or for sure it's 768 up and 5460 down service
I do know its Dallas cable provider and a business class service with a pretty wide band.
Is this the best it will do?

Log into your router/modem and see what line speed it is getting from your ISP. You should be getting at least 90% of the line speed for cable internet.