Think I Tweaked My Dsl!!!!

[BiG DaN]

I THINK I DID IT!!!! WOOOO HOOOO!!!! I just messed with my RWIN's, and this is my current RWIN: 256960 ...And my tweak test:


TCP options string = 020405b40103030201010402

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) = 256960
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 64240
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)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 10278.4 kbps (1284.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4111.36 kbps (513.92 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 34 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

[MBROWN2480]

What are your advertised speeds and what sort of speeds are you getting?

[xbit]

If you are on ppoe, meaning you have to dial in for dsl access. then you need to set your mtu to 1492.

[BiG DaN]

Yes, i think i am on pppoe, or whatever, i think i will put my mtu on 1492 now then. and my advertised speeds are ughm, id say 800 kbps ? and im getting like 200 kbps connections. and downloads are 25 kb/sec at MAXIMUM. by the way, no, it didnt work. i changed my RWIN and rebooted and it told me i had 513 kb/sec on the tweak test, which is good, compared to what i used to get on the tweak tests on here..[132 kb/sec] but even though it said i had 513 kb/sec on the tweak test, my downloads weren't any faster. so i tried another RWIN, and here are the results.


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) = 371712
RWIN Scaling (RFC1323) = 3 bits
Unscaled Receive Window = 46464
For optimum performance, consider changing RWIN to 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: 14868.48 kbps (1858.56 KBytes/s) @ 200ms
Your RcvWindow limits you to: 5947.392 kbps (743.424 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 34 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

[MBROWN2480]

If the TCP/IP analyser says your MTU is 1500 it is okay. On an 800 line you don't need a Rwin as large as you have been using. Your Rwin is calculated by bandwidth x latency / 8. To find your latency use a large packet ping time to your gateway or another remote site. e.g. from a DOS window,
ping -l 1472 -f [remotesite]

This will also help us determine what your MTU should be set to. If you can't ping with a packet size of 1472 try 1464.

Even if your pings were high, say 300ms, your Rwin for your line speed would only be around 30000.

[BiG DaN]

i have no clue what yer talking about?? i dont know how to ping myself??

[MBROWN2480]

I didn't say to ping you yourself, I said your gateway or a remote site.

If you don't know how to open a DOS window go to start, run, type in command /k, then click ok. Once there type ping -? and press enter for instructions.
Type in ping -l 1472 -f speedguide.net and press enter for results like below.

C:\WINDOWS>Ping -l 1472 -f speedguide.net

Pinging speedguide.net [161.58.189.81] with 1472 bytes of data:

Reply from 161.58.189.81: bytes=1472 time=309ms TTL=242
Reply from 161.58.189.81: bytes=1472 time=311ms TTL=242
Reply from 161.58.189.81: bytes=1472 time=310ms TTL=242
Reply from 161.58.189.81: bytes=1472 time=308ms TTL=242

Ping statistics for 161.58.189.81:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 308ms, Maximum = 311ms, Average = 309ms