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      <base href="https://bugzilla.netfilter.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - manual page does not describe special icmp type of 255"
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1124">1124</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>manual page does not describe special icmp type of 255
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>iptables
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P5
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>iptables
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>netfilter-buglog@lists.netfilter.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>alexis@m2osw.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When I type `man iptables-extensions` under Ubuntu 16.04, I get a page with the
following description of the ICMP type:

   icmp (IPv4-specific)
       This extension can be used if `--protocol icmp' is specified. It
provides the following option:

       [!] --icmp-type {type[/code]|typename}
              This allows specification of the ICMP type, which can be a
numeric ICMP type, type/code pair, or one of the ICMP type names shown
              by the command
               iptables -p icmp -h


As we can see, there is no word about the "Note" found on this page:

<a href="https://www.frozentux.net/iptables-tutorial/chunkyhtml/a6339.html">https://www.frozentux.net/iptables-tutorial/chunkyhtml/a6339.html</a>

which clearly says that 255 is treated specially by iptables to mean "any".

I think it would be a good thing to add that note to the manual page. Also
since there is a name "any", maybe make a clear correlation between both.</pre>
        </div>
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