New here, so need help...

willingwelli · Post by **willingwelli** » Tue Sep 12, 2006 11:59 pm

I'm new to all this, and have done searches, unless I'm just blind

, i can't find anything.

Well, I have Cincinnati Bell's Zoomtown dsl. My rated speeds are 3mbps down, and 768 kbps up. My speeds are NO WHERE near that. False advertisement? Or could tweaking improve my speeds? Here is what I got from the analyzer...

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: 10278.4 kbps (1284.8 KBytes/s) @ 200ms
Your TCP Window limits you to: 4111.36 kbps (513.92 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) = 00000000 (0)

Any help would be appreciated, as to I'm lost.

Gary335 · Post by **Gary335** » Wed Sep 13, 2006 12:04 am

Looking at your config, I'd say your pretty much optimized. It probably has to do with distance more than anything else. The further away from the phone company's CO (central office)you are, the slower your connection will be. In other words, unless you live right next door to the CO, your probably not going to achieve the maximum speeds they advertise.

YARDofSTUF · Post by **YARDofSTUF** » Wed Sep 13, 2006 12:21 am

I'm use to seeing 1492 for a MTU on dsl setups, dont think thats gonna help you though.

What do you get for speed and where are you testing it?

willingwelli · Post by **willingwelli** » Wed Sep 13, 2006 2:29 am

On download speeds I get about 115 kbps average. I'm advertised at 3mbps, and 768. When I do a speed test, I average about 800, and 400 ups. :-\. I did the tweak tool, and my downloads will start out around 300, and slow down to 115. Hey, atleast it helped a little, just not much. Anything else I can possibly do? Oh, and I'm coming from Northern, KY.

trogers · Post by **trogers** » Wed Sep 13, 2006 2:38 am

Your TcpWindowSize (RWIN) may have been set too large and may slow you down if you face retransmissions of data packets.

Use the following custom setting 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 - 64240
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

(EDIT) - Speedtests give results in kbps (kilobits per sec) while file download gives KB/s (KiloBytes per sec).

1 KB/s = 8 kbps