Rwin setting

Aero · Post by **Aero** » Wed Apr 04, 2001 2:59 pm

I ran the tcp/analyzier and it keeps telling me my rwin is 65536 even though I changed it in the registry. I've also run that patch it says to install if this problem occurs, however, it still says my rwin is 65536. What's the deal?

Lobo · Post by **Lobo** » Wed Apr 04, 2001 3:09 pm

What OS are you running sir

Aero · Post by **Aero** » Wed Apr 04, 2001 3:29 pm

win98 SE

Lobo · Post by **Lobo** » Wed Apr 04, 2001 3:32 pm

65535 not 65536 but anywho go to patch page off main page this site and download and install Vtcp386 Fix for your OS, reboot your ready

Aero · Post by **Aero** » Wed Apr 04, 2001 3:43 pm

I ran the patch for win98 and it didn't change a thing...here's what the analyzer tells me:
TCP options string = 020405b401010402

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) = 65535
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 65535
Note: Under Windows 9x, if you have RWIN set to any other value, and the Analyzer reports 65535 you might need to install the MS Vtcp386 fix.
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: 2621.4 kbps (327.675 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 117 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

Lobo · Post by **Lobo** » Wed Apr 04, 2001 3:46 pm

Did you reboot, sometimes you have to do it 3 or 4 times, come back and let me know, then we try something else

Aero · Post by **Aero** » Wed Apr 04, 2001 3:59 pm

I rebooted several times to no avail, i'm getting the same results.

SheepThriLL · Post by **SheepThriLL** » Wed Apr 04, 2001 4:07 pm

same thing happened to me... i installd the patch.. didnt work.

so i gave up... the only reason i was trying to tweak was to get 2 connections to play UT simultaneously over my adsl connection pac bell (1200 down 105 up speed test, but i get horrible ping spikes to 800+ ms all the time.. and sub 120 pings steady no probs if one computer connected. some say my upload speed is the culprit.. but i say horse poo.. should be plenty of speed for 2 ut games... tried most everyting... including changing netspeeds, tweaking, etc. any ideas?

Lobo · Post by **Lobo** » Wed Apr 04, 2001 4:08 pm

Are you connected thru @home and do you have any of there software on your computer

Aero · Post by **Aero** » Wed Apr 04, 2001 4:12 pm

I'm on a t3 university network...I have no @home software on my computer.

Lobo · Post by **Lobo** » Wed Apr 04, 2001 4:15 pm

OK do this, Window scaling must say yes:
Download lastest version of Dr. TCP from http://www.dslreports.com/front/drtcp.html
This is just a shortcut to your registry.
1.) Select your adapter
2.) Window Scaling- Yes
3.) Time stamping - No
4.) Selective Acks - Yes
5.) Path MTU Discovery - Yes
6.) Max Duplicate ACKS - 3
7.) TTL - 32 -64 (Nothing to do with speed
Click Apply button at botton and reboot for it to take affect.
8.) Blank boxes only mean default value is being used
9.) Do not change numbers in these boxes unless you know what you are doing.
(Play with it until apply button lites up, then click it)

Lobo · Post by **Lobo** » Wed Apr 04, 2001 4:20 pm

SheepThriLL, do the above

Aero · Post by **Aero** » Wed Apr 04, 2001 4:27 pm

Thanks, that fixed it...here are my new 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) = 513920
RWIN Scaling (RFC1323) = 3 bits
Unscaled Receive Window = 64240
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
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: 20556.8 kbps (2569.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 8222.72 kbps (1027.84 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 53 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

Lobo · Post by **Lobo** » Wed Apr 04, 2001 4:29 pm

OK, good job man