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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Shorewall and ECN</title>
<meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1">
<meta name="author" content="Tom Eastep">
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4"
bgcolor="#400169" height="90">
<tbody>
<tr>
<td
width="100%">
<h1 align="center"><font color="#ffffff">ECN</font></h1>
</td>
</tr>
</tbody>
</table>
<br>
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.<br>
<br>
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).<br>
<br>
You enable ECN by<br>
<br>
<blockquote>
<pre><b><font color="#009900">echo 1 &gt; /proc/sys/net/ipv4/tcp_ecn</font></b></pre>
</blockquote>
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.<br>
<br>
<blockquote>
<pre><b><font color="#009900">net.ipv4.tcp_ecn = 1<br><br></font></b></pre>
</blockquote>
Entries in /etc/shorewall/ecn have two columns as follows:<br>
<br>
INTERFACE&nbsp;&nbsp;&nbsp; - The name of an interface on your system<br>
<br>
HOST(S)&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; - An address (host or subnet)
of a system or group of systems accessed through the &nbsp;interface in the
first column. You may include a comma-separated list of such addresses in
this column. <br>
<br>
Example: Your external interface is eth0 and you want to disable ECN for
tcp connections to 192.0.2.0/24:<br>
<br>
In /etc/shorewall/ecn:<br>
<br>
<blockquote>
<table cellpadding="2" cellspacing="0" border="1">
<tbody>
<tr>
<td valign="top"><b>INTERFACE<br>
</b></td>
<td valign="top"><b>HOST(S)<br>
</b></td>
</tr>
<tr>
<td valign="top">eth0<br>
</td>
<td valign="top">192.0.2.0/24<br>
</td>
</tr>
</tbody>
</table>
<br>
</blockquote>
<font size="2">Last updated 3/28/2003 - <a href="support.htm">Tom Eastep</a></font>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p>
</body>
</html>

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