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jmorlan
Hmm... That's funny.
Premium,MVM
join:2001-02-05
Pacifica, CA
kudos:4

ECN

I noticed that ECN is disabled by default in WIN7. I checked to see that my router is ECN capable using this tool from Microsoft and then enabled it via

netsh interface tcp set global ecncapability=enabled
 
Is there any downside to enabling ECN?

Thanks.


Irish Shark
Play Like A Champion Today
Premium,MVM
join:2000-07-29
Las Vegas, NV
kudos:4

1 edit

Read this and see if it helps. I do not have ECN enabled and I am not experiencing any issues. It is up to you how you want to configure your box.

http://technicallyeasy.net/2010/02/internet-connection-slow-in-windows-7/

This is what I have set for WIN7

Microsoft Windows Version 6.1.7601 Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Windows\system32>netsh int tcp show global Querying active state... TCP Global Parameters ---------------------------------------------- Receive-Side Scaling State : enabled Chimney Offload State : automatic NetDMA State : enabled Direct Cache Acess (DCA) : disabled Receive Window Auto-Tuning Level : normal Add-On Congestion Control Provider : none ECN Capability : disabled RFC 1323 Timestamps : disabled ** The above autotuninglevel setting is the result of Windows Scaling heuristics overriding any local/policy configuration on at least one profile.
--
"You can observe a lot by watching". Yogi Berra


Dustyn
Premium
join:2003-02-26
Ontario, CAN
kudos:11
reply to jmorlan

said by jmorlan:

I noticed that ECN is disabled by default in WIN7. I checked to see that my router is ECN capable using this tool from Microsoft and then enabled it via

netsh interface tcp set global ecncapability=enabled
 
Is there any downside to enabling ECN?

Thanks.

That tool says it's for Windows XP and Windows Vista.
No mention of Windows 7?

--
Remember that cool hidden "Graffiti Wall" here on BBR? After the name change I became the "owner", so to speak as it became: Dustyn's Wall »[Serious] RIP


jmorlan
Hmm... That's funny.
Premium,MVM
join:2001-02-05
Pacifica, CA
kudos:4

said by Dustyn:

said by jmorlan:

I noticed that ECN is disabled by default in WIN7. I checked to see that my router is ECN capable using this tool from Microsoft and then enabled it via

netsh interface tcp set global ecncapability=enabled
 
Is there any downside to enabling ECN?

Thanks.

That tool says it's for Windows XP and Windows Vista.
No mention of Windows 7?

You are correct. However I think it works on Win7. In any event it correctly identified ENC capability on my router. And it turns out there is a downside. Some web-sites don't work with it. I just spent all day troubleshooting a particular site that opened for one machine on my network but not another. Turns out enabling ENC on that machine caused the site to fail.

Thanks for reminding me that I had tweaked this setting. It solved a nagging problem.

See:

»RESOLVED Same site. One computer can connect, the other ....

Thank you again.