Need help for my TCP/IP settings.

[alexander3133]

My hardware and software configurations:
Operating System : Microsoft Windows XP SP2 with lastest updates.
Router : Aztech DSL600EW ADSL Wireless router with 4 ETH ports + USB
NIC : Intel (R) PRO/Wireless 2200BG with lastest driver
ISP : Streamyx Malaysia with Advertise speed 1.0Mbps/384kbps (but i got 1024kbps/512kbps displayed on my ADSL modem)

Result of the analyzer :

TCP properties for IP = 60.50.112.223 ()
Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

TCP options string = 020405a00103030201010402

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 your MTU value.

Default TCP Receive Window (RWIN) = 187200
RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)
Unscaled TCP Receive Window = 46800

RWIN is a multiple of MSS
Other RWIN values 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 (Note this is not a speed test):

Your TCP Window limits you to: 7488 kbps (936 KBytes/s) @ 200ms
Your TCP Window limits you to: 2995.2 kbps (374.4 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = OFF

Time to live left = 120 hops
TTL value is ok.

Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

Any idea how to get the best setting for my connection with TCP Optimizer?
Milliion Thanks!

[Philip]

You might want to change the RWIN (TCP Receive Window) value to 63360, you don't need a larger value on a 1Mbit line.

Also, you might want to set the "DisableUserTOSSetting" to 0, and the "DefaultTOSValue" to 80 in the advanced tab, and see how that works for you.

Best,

Philip

[alexander3133]

Thanks, besides these settings, can i get a full settings (TTL, MTU, etc.) that available for me to set in TCP Optimizer?

[trogers]

Thanks, besides these settings, can i get a full settings (TTL, MTU, etc.) that available for me to set in TCP Optimizer?

Use TCP Optimizer and do the following:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU - 1480
TTL - 64
TCP Receive Window - 63360
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - uncheck
Timestamps - uncheck
Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 5
Host Priority - 6
DNSPriority - 7
NetbtPriority - 8
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

[alexander3133]

My friend's connection seems to have problem, that is download speed is extremely slow, download speed is less than upload speed, and loading a web page is extremely slow. (Max download speed around 22kbps only)
Does anyone here know what are the problem might be occured?
ISP : Streamyx Malaysia (512kbps down/256kbps up) ADSL
OS : Windows XP SP2 Home
Using LAN cable connection to modem
NIC : Realtek RTL8139 Fast Ethernet

TCP properties for IP = 219.95.193.186 ()
Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; InfoPath.1)
Notes: Read the Analyzer FAQ if the above is not your IP address.

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 your MTU value.

Default TCP Receive Window (RWIN) = 63360
RWIN Scaling (RFC1323) = 0 bits
Unscaled TCP Receive Window = 63360

RWIN is a multiple of MSS
Other RWIN values 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) <-- current value

bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 2534.4 kbps (316.8 KBytes/s) @ 200ms
Your TCP Window limits you to: 1013.76 kbps (126.72 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 55 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) = AF22 010100 (20) - Assured Forwarding class 2, medium drop precedence (RFC 2597).

Million Thanks.

[trogers]

For 512/256 Kbps, you can try the following:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU - 1480
TTL - 64
TCP Receive Window - 31680
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - uncheck
Timestamps - uncheck
Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 5
Host Priority - 6
DNSPriority - 7
NetbtPriority - 8
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

However, Streamyx Malaysia has some rather major problems in their network: old national copper phone lines, oversubscribed lines and undersized international gateway routers.

These have been highlighted often in the following forum:

http://www.dslreports.com/forum/seasiabb

A tracert will help to locate the particular problem(s).