US Telco Support > AT&T > AT&T Midwest > Tweaking SBC DSL

Tweaking SBC DSL

try RWIN at 64000 and post back

I get it...

»monitor.dslreports.com/tweak/blo···terpppoe

I'll stick with 26280.

reply to WeKnSmith
set MTU at 1492 and RWIN 64000, if you are using DrTCP to make adjustments you might need to reboot. Your MTU is NOT 1492 according to that test.
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..MISTAKE RECOGNIZED IS HALF CORRECTED..

reply to WeKnSmith
are you testing via wireless card? or wired ethernet?
because your settings indicated your WiFi card.
for 1500 your RWIN should be between 32000 and 64000 (I would recommend to try 64000 and work your way down)
MTU discovery - YES
Window Scaling - YES
Time Stamping - NO
Selective Acks - YES
Black Hole Detection - NO
Max Duplicate ACKs -4
TTL - 128
and in the Adapter settings, make sure you have correct adaptor, there is a down arrow to select your adaper...
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..MISTAKE RECOGNIZED IS HALF CORRECTED..

reply to WeKnSmith
Edit: I got pointed here from the Tweaks forum.

Are you running a router? If so, make and model?

reply to WeKnSmith

said by WeKnSmith:

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Not sure what the problem is. I see the 1362 in the tweak test. I have included screen shots of the MTU in the router & the NIC card.

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reply to McSummation

said by McSummation:

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...Are you running a router? If so, make and model?

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reply to WeKnSmith
I agree with efflandt. I just ran the "what size is my MTU" using the ping method and got 1472 as the value. However, the Tweak test shows 1362. My router claims 1492 as the negotiated MTU.

reply to WeKnSmith
I came over from the tweaks forum as well. Just a couple of points to consider:
1. Optimal RWIN should be an even multiple of the MSS.
2. BBR tweak test CAN misread the MTU, usually due to the type of routers in between. (Mine shows 1466 even though I actually have 1492)
3. Base your tweaks on your known actual MTU/MSS if tweak test shows something different.

With all that considered, if you have done the pinging and know your MTU is 1492, tweak accordingly. I would recommend the following:

-Set the TCP Receive Window to 31944. (assumes line quality is good)
-Set everything with a pull down option/menu to Default.
-Blank/Clear all other fields.
-Save.
-Reboot.
-Post an up-to-date tweak test.
-Post a line quality test.
-Post the results of the speed test nearest you.
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reply to WeKnSmith
I have a FR114P Should I change the MTU on my computer and Router or just the router since my computer is going thru it. I have my router set to 1500 MTU I will try changeing it to 1492. does RWIN matter on a router ?

What should my Rwin be im on the 1.5/384 plan but its really around 1.2/320

Thanks

reply to WeKnSmith
I set my MTU in my FR114P to 1492 and I got

Download = 1.288 Mbps
Upload = 324.07 kbps

which is better then the 1.2/319-320 i was getting.

Will changeing the Rwin on and MTU with DrTCP change anything. ?

reply to WeKnSmith
try it, make sure to reboot as RWIN is a registry entry and will not update (even in XP) until you reboot. try 64000 out of curiosity
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..MISTAKE RECOGNIZED IS HALF CORRECTED..

reply to WeKnSmith
tried 64000 and got

Download = 1.292 Mbps
Upload = 325.28 kbps

Will going lower help should i select 1492 on my NIC it shouldent really matter cause im connected to the internet thru my FR144P.

reply to sargeeld

said by sargeeld:

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-Post an up-to-date tweak test.
-Post a line quality test.
-Post the results of the speed test nearest you.

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reply to sargeeld

said by sargeeld:

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-Set the TCP Receive Window to 31944. (assumes line quality is good)
-Set everything with a pull down option/menu to Default.
-Blank/Clear all other fields.
-Save.
-Reboot.

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reply to WeKnSmith
Looks like a lower RWIN is better for you. Try 26440.

reply to WeKnSmith
It's already done...Good Luck...