Bug 117665

Summary: TCP ECN should be disabled by default until the rest of the world stops sucking
Product: [Retired] Red Hat Raw Hide Reporter: Nicholas Miell <nmiell>
Component: distributionAssignee: Bill Nottingham <notting>
Status: CLOSED WONTFIX QA Contact: Brock Organ <borgan>
Severity: medium Docs Contact:
Priority: low    
Version: 1.0CC: barryn, mitr, remedy, rvokal, thoron
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Hardware: All   
OS: Linux   
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Last Closed: 2005-03-02 19:38:47 UTC Type: ---
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Description Flags
A handy-dandy patch to the three flavors of sysctl.conf none

Description Nicholas Miell 2004-03-06 19:39:13 UTC 
This isn't technically a bug in any Linux software, but the
interoperability problems are going to confuse the hell out of users
anyway.

Basically, 2.6 kernels have TCP ECN enabled by default. Unfortunately,
everybody else craps themselves when they see packets with the ECN bit
set, resulting in "myserious web sites that I can't connect to"-type
problems.

So, until the rest of the networking world is dragged kicking and
screaming into, well, 1999 or so, /etc/sysctl.conf should have
"net.ipv4.tcp_ecn = 0" in it.
Comment 1 Nicholas Miell 2004-03-06 19:46:13 UTC 
Created attachment 98345 [details]
A handy-dandy patch to the three flavors of sysctl.conf

New! and Improved! Bug: Now with Minimal Effort Required!
Comment 2 Petri T. Koistinen 2004-03-06 20:06:16 UTC 
Nothing gets fixed until something breaks. So it's good to break
things in order to get things fixed. Minor break is not fixed, major
is. Better break more when you breaking things. Keep the default.
Comment 3 Bill Nottingham 2004-03-08 16:40:24 UTC 
That doesn't help upgrades though. Arjan: what's the plan on the
kernel-level default?
Comment 4 Bill Nottingham 2004-03-08 20:13:25 UTC 
*** Bug 117745 has been marked as a duplicate of this bug. ***
Comment 5 Bill Nottingham 2005-03-02 19:38:47 UTC 
I don't think this is going to be changed in sysctl.conf. I believe
the kernel defaults to off these days.