In ICMP terminology, "echo" is what we normally call "ping".  So "uses
ECHO protocol" might just be another way of saying that it uses ICMP. 
See
http://en.wikipedia.org/wiki/Internet_Control_Message_Protocol#List_of_permitted_control_messages_.28incomplete_list.29
& search for "Echo Request" & "Echo Reply".

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Haim (Howard) Roman
Computer Center, Jerusalem College of Technology
roman <at> jct.ac.il
Phone: 052-8-592-599 (6022 from within Machon Lev)

-------- Original Message  --------
Subject: [fw-wiz] ECHO Protocol
From: peng liu <cleverpigboy <at> gmail.com>
To: firewall-wizards <at> listserv.cybertrust.com
Date: Thu Jun 26 2008 13:00:03 GMT+0300 (IDT)
> All,
>  
> I am checking the ICMP protocol these days and some documents say that
> Ping command in Windows uses ICMP protocol, while others say that Ping
> uses ECHO protocol, which is through TCP port 7.
>  
> So my question is which protocol is actually used by PING command in
> Windows?
>  
> Pengy
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