Bug 117745 - TCP ECN is enabled by default, breaking some net connections
TCP ECN is enabled by default, breaking some net connections
Status: CLOSED DUPLICATE of bug 117665
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brian Brock
Depends On:
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Reported: 2004-03-07 22:00 EST by Brian L
Modified: 2007-11-30 17:10 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2006-02-21 14:01:52 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Brian L 2004-03-07 22:00:32 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6)

Description of problem:
Kernel has TCP ECN (Explicit Congestion Notification) enabled by
default, which some routers (notably the popular Netgear SOHO variety)
do not handle correctly, effectively breaking TCP connections accross
that router.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.Fedora Core2 Test 1 behind Netgear WGR614 with latest firmware 1126
2.Attempt HTTP connection to external system

Actual Results:  Ping + Traceroute + DNS to internet hosts OK
Timeouts in Mozilla, Konquerer, Lynx, and in raw telnet to port 80.
Manually disabling ECN as below restores functionality until reboot:
echo "0" > /proc/sys/net/ipv4/tcp_ecn

Expected Results:  Mozilla, Konquerer, and Lynx should be able to
access http://fedora.redhat.com

Additional info:

Workaround to disable ECN using command:
echo "0" > /proc/sys/net/ipv4/tcp_ecn
Comment 1 Bill Nottingham 2004-03-08 15:13:22 EST

*** This bug has been marked as a duplicate of 117665 ***
Comment 2 Red Hat Bugzilla 2006-02-21 14:01:52 EST
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.

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