[Bug 1124] New: manual page does not describe special icmp type of 255

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1124

            Bug ID: 1124
           Summary: manual page does not describe special icmp type of 255
           Product: iptables
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: iptables
          Assignee: netfilter-buglog at lists.netfilter.org
          Reporter: alexis at m2osw.com

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:

https://www.frozentux.net/iptables-tutorial/chunkyhtml/a6339.html

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.

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