Other values for RWIN that might work well with your current MTU/MSS:

[MarcX]

TCP options string = 020405b40103030301010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which is equal to MSS.

Default Receive Window (RWIN) = 522680
RWIN Scaling (RFC1323) = 3 bits
Unscaled Receive Window = 65335
RWIN is a multiple of MSS
Other values for RWIN 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)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 20907.2 kbps (2613.4 KBytes/s) @ 200ms
Your RcvWindow limits you to: 8362.88 kbps (1045.36 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 56 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000


Test running.....
** Speed 3444(down)/na **
(At least 68 times faster than a 56k modem)
Finish.


PIII 450mhz SDR 96 OS 98se

what's other values for RWIN would be best for mine? please help

[Lobo]

Try RWIN's of 417560, 420480 or 438000:) :)

[CaptainSpeleo]

Lobo:

Why such high RWin values for a MaxMSS of 1460? I'm just curious. I use an RWin value of 256256 for a MaxMSS of 1456. My Roadrunner cable modem upstream and downstream rates stay pretty close to their capped rates of 384 Kb/s and 2048 Kb/s.

[Lobo]

Million reasons but depends on size of CPU and how much RAM you have, you may reach your CAP with what you have now but that is not the object, it's HOW FAST you reach your cap that mattes

Media Access Control (MAC)
The MAC sits between the upstream and downstream portions of the cable modem, and acts as the interface between the hardware and software portions of the various network protocols. All computer network devices have MACs, but in the case of a cable modem the tasks are more complex than those of a normal network interface card. For this reason, in most cases, some of the MAC functions will be assigned to a central processing unit (CPU) -- either the CPU in the cable modem, or the CPU of the user's system. Hence, the CPU does affect the speed of the cable modem as does the NIC. All NIC's use some CPU cycles to process information. If the CPU is faster, then the processing of that info will be faster and therefore download and uploads will be faster...this can be found on the site http://www.howstuffworks.com/

:)

[CaptainSpeleo]

Thanks for your reply, Lobo. My HP 8160 computer is 4 years old. It has an Intel 233 MHz Pentium w/MMX processor(which is overclocked to 262 MHz) and 128 MB of EDO RAM. The operating system is Windows 98SE.