6 Mbps = how many KBps?

[Tramp429]

My net connection is advertised as up to 6Mbps/512 Kbps. It runs at 385KBps. Does that sound right? It doesn't to me.

[YottaHertz]

No.... 6Mbps should be 6 x 1024 = 6144Kbps.... 6144Kbps / 8 (bits per byte) = 768KBps so it's half of what it's supposed to be.... Unless I messed something up....

[elroy]

My adsl is 1.5Mbps and it downloads at about 175Kbps
I would think you should get around 700Kbps. I assume you have cable? Does it always run at the same speed or does it vary considerably? I'll bet your account is set at 3.0Mbps.

[cableuser]

I have comcast cable for my internet and the advertised speeds are 6Mbps. I am lucky if I get 1.5-3Mbps avg. I actually called them up because I was kept getting consistant speeds of 1.5Mbps. They said I should get around 3-4Mbps but I don't so thats probably the same problem you are having. The ISP's are ripping you off big time.

[RobRich]

I would wager your TCP/IP configuration is far from optimal, especially if you are using the default settings. Use TCP Optimizer.

http://www.speedguide.net/downloads.php

If you do not want to get into the low-level settings, click optimal settings, move the slider to your specified connection rate, then apply the automatically calculated changes. Reboot, and hopefully you will have a much faster connection.

[cableuser]

Heh, I might as well try that program out too. Thanks Rob.

[RobRich]

Quote:

Heh, I might as well try that program out too.

Go for it. By default, the Windows TCP/IP stack is far from optimal for most anything beyond a basic 10/100 LAN.

[elroy]

Please post back and let everyone know if the TCP Optimizer helped.
I used similar programs back when I had dial-up and never did see any difference. Maybe it works better with broadband.

[cableuser]

Before I took the test I was getting 2Mps download speed with speakeasy. After I downloaded the program ran it and did all the registry changes I rebooted and ran the test again. I got 1600Mps for a download speed. So for me anyway it looks to be the ISP that is slow.

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 = 51 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00100000 (32)
Precedence (priority) = 001 (priority)
Delay = 0 (normal 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) = CS1 001000 (8) - class 1 (RFC 2474). Similar forwarding behavior to the ToS Precedence field.

[Tramp429]

I did that a while back Rob.

I found the problem. When Bellsouth upgraded and changed their service and prices I got screwed. $49.95 for dsl xtreme @ 3Mbps. I just changed it to dsl xtreme 6.0 @ 6Mbps for $46.95.