Need tweaking help

Dark_Regent · Post by **Dark_Regent** » Mon Jan 21, 2008 6:17 am

Connection cable
ISP Ensight
Advertised speed 10 mb down 1 mb up
Running xp service pack 2

TCP properties for IP = xx.xx.xx.xx.xx
Browser/OS = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.7) Gecko/20070914 Firefox/2.0.0.7
Notes: Read the Analyzer FAQ if the above is not your IP address.
TCP options string = 0204021801010402
MTU = 576
MTU value optimized for dialup. Consider increasing your MTU for broadband.
MSS = 536
MSS is not optimized for broadband. Consider increasing your MTU value.
Default TCP Receive Window (RWIN) = 5360
RWIN Scaling (RFC1323) = 0 bits
Unscaled TCP Receive Window = 5360

RWIN seems to be set to a very small number. If you're on a broadband connection, consider using a larger value.
RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
523136 (MSS x 122 * scale factor of 8)
261568 (MSS x 122 * scale factor of 4)
130784 (MSS x 122 * scale factor of 2)
65392 (MSS x 122)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 214 kbps (27 KBytes/s) @ 200ms
Your TCP Window limits you to: 86 kbps (11 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.
MTU Discovery (RFC1191) = OFF
Time to live left = 112 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

trogers · Post by **trogers** » Mon Jan 21, 2008 9:38 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 - 256960
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - checked
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

After reboot, post a new TCP Analyzer report.

Dark_Regent · Post by **Dark_Regent** » Mon Jan 21, 2008 9:54 am

Much better I am now getting my speed as checked with speakeasy.
8463 down 937 up

TCP properties for IP = xx.xx.xx.xx.xx
Browser/OS = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
Notes: Read the Analyzer FAQ if the above is not your IP address.
TCP options string = 020405b40103030201010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
Default TCP Receive Window (RWIN) = 256960
RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)
Unscaled TCP Receive Window = 64240

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4) <-- current value
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 10278 kbps (1285 KBytes/s) @ 200ms
Your TCP Window limits you to: 4111 kbps (514 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = OFF
Time to live left = 48 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 01010000 (80)
Precedence (priority) = 010 (immediate)
Delay = 1 (low delay)
Throughput = 0 (normal throughput)
Reliability = 0 (normal reliability)
Cost = 0 (normal cost)
Check bit = 0 (correct, 8th checking bit must be zero)

DiffServ (RFC 2474) =