Help With Tweaking!

[Jin]

I was wondering if I could increase the speed of my DSL. My ISP is Verizon DSL and it's 768kbps down/128kbps up. Any help would be appreciated.

TCP options string = 020405b401010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 17520
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 17520
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: 700.8 kbps (87.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 280.32 kbps (35.04 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

MTU Discovery (RFC1191) = ON

Time to live left = 116 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

[mnosteele52]

Hi Jin try the following, read "My Tips" in my sig and try the suggestions and download the TCPOptimizer and try these settings:

Settings tab:

select - DSL
check - custom settings
network adapter selection - your NIC
check modify all adapters
maxmtu - 1500
TTL - 64
TCP Receive Window - 8760/11680/13140/18980/27740/46720
MTU Discovery - yes
Black Hole Detect - no
Selective Acks - yes
Max Dup ACKs - 2
TCP 1323 Options - uncheck both boxes*
(* if using TCP Receive Window of 65535 or higher check windows scaling)

Other Settings tab:

Max Connections per Server - 20
Max Connections per 1.0 Server - 40
Lan Browsing Speedup - optimized

Then select "Apply Changes" and reboot to take effect.

[Jin]

I just did what you told me to do and before I did a reboot with the changes I did a Speakeasy test that was in Philadelphia and I got 512 before changes and now 682 after the changes. Is that good. Oh and I only did the test once and not repeatedly.

Update: I just took 10 Speakeasy test at the Atlanta location and I got an average of 705.4kbps. Keep in mind that it's kbps not KBps. And I used the 46720 RWIN for all of the tests even the ones in Philadelphia.

[mnosteele52]

That's awesome Jin you are getting above 90% of your caps.

[Jin]

Thanks and I thank you for helping me.