Please help me, new XP User, bad network speeds.

[Sav]

Hey guys,

I am at college and recently got XP. How do optimize XP for my college network. Heres what the TCP\IP analyzer says on my current set up. I tried looking around reg edit but I dont know where to go on XP. I have 2 network cards, one for my home network and one for Internet. I disabled the lan ethernet card because this computer is no longer on my home network. Just wanted to tell you I had 2 cards in case if there were seperate TCP\IP entries.


TCP options string = 020405640101010101010402

MTU = 1420
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.

MSS = 1380
Maximum useful data in each packet = 1380, which is equal to MSS.
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.

Default Receive Window (RWIN) = 1380
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 1380
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
507840 (MSS x 46 * scale factor of 8)
253920 (MSS x 46 * scale factor of 4)
126960 (MSS x 46 * scale factor of 2)
63480 (MSS x 46)

bandwidth * delay product:
Your RcvWindow limits you to: 55.2 kbps (6.9 KBytes/s) @ 200ms
Your RcvWindow limits you to: 22.08 kbps (2.76 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

MTU Discovery (RFC1191) = ON

Time to live left = 50 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000


How do I optimize this, the 6.9 kb/sec is rediculous for a college connection.

Thanks,
Sav

[MadDoctor]

DSL right?

[Sav]

No, its my college connection, so I think t3?

Thanks
Sav

[Sav]

any help on this anyone? :)

[Revision78]

Just out of curiousity, try removing the non-used nic. Even though it may be disconnected it may still be sending out broadcasts. Also just for the heck of it, remove the protocols for the nic being used. As in previous versions of windows i have noticed occasionally they get a little hay-wire and like to be refreshed. Next, go to a neighbors dorm room and see what kind of rates they get on their transfers. if they get the same the campus may be having internal problems.

[Kip Patterson]

The problem isn't apt to be in the network. Your parameters are a mess. Plese remove and reinstall TCP/IP for both NICS, only reinstall for the NIC being used.

Your school is on oARnet, and they usually have pretty good connectivity.

Kip

[Sav]

I removed and readded my ethernet card and tcp\ip driver. I still get the same thing

SpeedGuide.net TCP/IP Analyzer
TCP properties for IP = 134.53.209.17 ()
Note: Read the FAQ if the above is not your IP address.
Browser/OS = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)

TCP options string = 0204056401010402

MTU = 1420
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.

MSS = 1380
Maximum useful data in each packet = 1380, which is equal to MSS.
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.

Default Receive Window (RWIN) = 1380
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 1380
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
507840 (MSS x 46 * scale factor of 8)
253920 (MSS x 46 * scale factor of 4)
126960 (MSS x 46 * scale factor of 2)
63480 (MSS x 46)

bandwidth * delay product:
Your RcvWindow limits you to: 55.2 kbps (6.9 KBytes/s) @ 200ms
Your RcvWindow limits you to: 22.08 kbps (2.76 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

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



What do I need to adjust to optimize connection? My speeds are awful :/. Any help would be GREATLY appreciated.

Thanks so much guys.

[drdoug99]

download the proper patches for your OS. it should change your MTU and MSS to the maximum values.

your RWIN I'm not to sure how/why to change that.

but this:
Your RcvWindow limits you to: 55.2 kbps (6.9 KBytes/s) @ 200ms
Your RcvWindow limits you to: 22.08 kbps (2.76 KBytes/s) @ 500ms


is low, once you get your RWIN to a higher #, your speeds should increase too. hopefully the patches take care of that, or someone else can explain more.

[Sav]

Yes I need help badly with my RWIN, I really need to know how to change it. Also there are no patches for my OS (WinXP) on this site, does anyone know where I can obtain some patches?

- Thank you
- Sav

[lizzdmc]

Hi Sav:

Download DrTCP from http://www.dslreports.com

Execute the program and fill in the variables according to the Windows 2000 registry tweaks that are listed here on SpeedGuide,net. The program is a "shortcut" to the registry.

I have Windows XP, also... you might try to change your settings using DrTCP to:

MTU = 1500

Default Receive Window (RWIN) = 507840

RWIN Scaling = On

... then reboot and run the TCP/IP analyzer again.

Good Luck :)

[lizzdmc]

Ooops! Mistake... :rolleyes:

Default receive window (RWIN) = 256960

(This is a multiple of 1460 MSS, which goes with 1500 MTU)

Ok, that should do it... :D