AT&T Connecticut: My Speeds have tanked! :(

HeadRusch · Post by **HeadRusch** » Sat Jul 20, 2002 12:40 pm

Anyone else experiencing the same problem?

AT&T Cable in Connecticut....used to get 180K transfers or so, so figured I was getting most of the 1.5Mbit bandwith they capped us all at...........

My online game ping times were in the 40's to mid 100's depending on the server, etc.

Now, however, for the past several days I've noticed my cable modem spending alot of time "resetting" itself..............and now I can't find a game online where I get a ping time of less than 300!!!

My download speeds have dropped to 40K downloads..

HELP!

mnosteele52 · Post by **mnosteele52** » Sat Jul 20, 2002 12:44 pm

If it's resetting itself alot there is most likely a line problem somewhere maybe on your end or maybe on your ISPs end. I would suggest checking all your cable connections at your house and your cat5 cable that goes from your modem to your NIC and make sure they are all secure. Have you had any storms lately, possibly a surge or spike? Also try power cycling your modem, unplug the power for 15 seconds and plug it back in.

HeadRusch · Post by **HeadRusch** » Sat Jul 20, 2002 1:09 pm

I ran the analyzer....is this the normal result for those of us on AT&T BI?

bandwidth * delay product:
Your RcvWindow limits you to: 350.4 kbps (43.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 140.16 kbps (17.52 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

mnosteele52 · Post by **mnosteele52** » Sat Jul 20, 2002 1:17 pm

Your RWIN may be too low, post the whole analyzer results.

HeadRusch · Post by **HeadRusch** » Sat Jul 20, 2002 1:35 pm

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) = 8760
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 8760
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: 350.4 kbps (43.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 140.16 kbps (17.52 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

MTU Discovery (RFC1191) = ON

Time to live left = 114 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

mnosteele52 · Post by **mnosteele52** » Sat Jul 20, 2002 1:50 pm

OK your at defaults, you need to tweak. First download the TCPOptimizer (the link is in my signature) then try these settings:

Settings tab:

select - cable modem
check - custom settings
network adapter selection - your NIC
check modify all adapters
maxmtu - 1500
TTL - 64
TCP Receive Window - 27740/36500/55480/74460/93440
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.

You also need to download and install the MS vtcp.386 patch. Install the patch and try the settins I suggested above.

UnitedWeStand · Post by **UnitedWeStand** » Sat Jul 20, 2002 1:52 pm

Dude your on Cable connection.. go ahead and download the optimizer and set it at extreme.. that should make a big difference but you're still going to have trouble getting downloads and uploads if the other parties your are downloading from and uploading to have a much slower connection than you..

mnosteele52 · Post by **mnosteele52** » Sat Jul 20, 2002 1:53 pm

A RWIN of 513920 is too high for a 1500 capped connection.

UnitedWeStand · Post by **UnitedWeStand** » Sat Jul 20, 2002 2:08 pm

Originally posted by mnosteele52
A RWIN of 513920 is too high for a 1500 capped connection.

Well yeah sorta high but we are looking for an average setting here lets start with the Corvette and work our way to a Lumina. and if its better for HeadRusch to use a Lumina then well just have to see.
HeadRusch, what are your download speeds after your little adjustments?

HeadRusch · Post by **HeadRusch** » Sat Jul 20, 2002 2:42 pm

You people are gods

I just used the "optimal" setting for Cable, and immediately my downlodas went back up to 175K and my pings in HalfLife were down in the 40's.

WOOOOOOOOOOO! THANK YOU!!!

now.......damn AT&T for their 1500bit download cap....so whats that...180K/bytes max download right? :P

UnitedWeStand · Post by **UnitedWeStand** » Sat Jul 20, 2002 3:02 pm

1 byte (B) = 8 bits (b)
1.5Mb = 187.5 KB