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-
-
-
- Shorewall and ECN
-
-
-
-
-
-ECN
-
-Explicit Congestion Notification (ECN) is described in RFC 3168 and is
-a proposed internet standard. Unfortunately, not all sites support ECN
-and when
-a TCP connection offering ECN is sent to sites that don't support it,
-the
-result is often that the connection request is ignored.
-
-To allow ECN to be used, Shorewall allows you to enable ECN on your
-Linux systems then disable it in your firewall when the destination
-matches a list that you create (the /etc/shorewall/ecn file).
-
-You enable ECN by
-
-
- echo 1 > /proc/sys/net/ipv4/tcp_ecn
-
-You must arrange for that command to be executed at system boot. Most
-distributions have a method for doing that -- on RedHat, you make an
-entry in /etc/sysctl.conf.
-
-
- net.ipv4.tcp_ecn = 1
-
-Entries in /etc/shorewall/ecn have two columns as follows:
-
-INTERFACE - The name of an interface on your system
-
-HOST(S) - An address (host or
-subnet) of a system or group of systems accessed through the
- interface in the first column. You may include a comma-separated
-list of such addresses in this column.
-
-Example: Your external interface is eth0 and you want to disable ECN
-for tcp connections to 192.0.2.0/24:
-
-In /etc/shorewall/ecn:
-
-
-
-
-
- INTERFACE
- |
- HOST(S)
- |
-
-
- eth0
- |
- 192.0.2.0/24
- |
-
-
-
-
-
-Last updated 3/28/2003 - Tom
-Eastep
-Copyright © 2001, 2002, 2003 Thomas M. Eastep.
-
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-