Differences between version 3 and revision by previous author of ECN.
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| Newer page: | version 3 | Last edited on Wednesday, August 30, 2006 3:34:22 pm | by CraigBox | Revert |
| Older page: | version 1 | Last edited on Monday, August 11, 2003 11:27:37 am | by JohnMcPherson | Revert |
@@ -1,11 +1,17 @@
An [Acronym] for __E__xplicit __C__ongestion __N__otification.
-;
From the linux
configuration help -: Explicit Congestion Notification (ECN) allows routers to notify clients about network congestion, resulting in fewer dropped packets and increased network performance. This option adds ECN support to the Linux kernel, as well as a sysctl (/proc/sys/net/ipv4/tcp_ecn) which allows ECN support to be disabled at runtime.
+From the [Linux]
configuration help
-;:
Note that, on the Internet, there are many broken firewalls which refuse connections from ECN-enabled machines, and it may be a while before these firewalls are fixed. Until then, to access a site behind such a firewall (some of which are major sites, at the time of this writing) you will have to disable this option, either by saying N now or by using the sysctl.
+ Explicit Congestion Notification (ECN) allows routers to notify clients about network congestion, resulting in fewer dropped packets and increased network performance. This option adds ECN support to the Linux kernel, as well as a sysctl (/proc/sys/net/ipv4/tcp_ecn) which allows ECN support to be disabled at runtime.
+
+
Note that, on the Internet, there are many broken firewalls which refuse connections from ECN-enabled machines, and it may be a while before these firewalls are fixed. Until then, to access a site behind such a firewall (some of which are major sites, at the time of this writing) you will have to disable this option, either by saying N now or by using the sysctl.
----
-Apparently this is
caused by [Cisco] [PIX
] routers dropping [IP] packets with
ECN set in them
.
+Apparently most ECN problems are
caused by [CiscoPix
] routers dropping [IP] packets that have
ECN set.
If you encounter this problem, you can disable ECN at run time:
-
# echo 0 > /proc/sys/net/ipv4/tcp_ecn
+<pre>
+
# echo 0 > /proc/sys/net/ipv4/tcp_ecn
+</pre>
+----
+CategoryNetworking
