Re: ECHO Protocol

[Tim Donahue <tdonahue () vonsystems com>]

Quoting peng liu <cleverpigboy () gmail com>:

> OK. This is the tricky part since ICMP is built basd on IP protocol and it
> works on thesame layer as TCP/UDP. Then why my local services file contains:
>
> echo                7/tcp
> echo                7/udp

This is the echo daemon, see http://www.faqs.org/rfcs/rfc862.html for details.

> So the echo here is different than the Echo, Echo-reply protocol we are
> talking here?

The ping command uses ICMP in Windows.  Yes, I know that there are  
alternate "ping" programs that will allow you to use TCP, UDP or  
possibly anything that programmer could think of, but the traditional  
ping uses ICMP.  Two of the ICMP types are referred to as echo and  
echo reply, which are the ICMP types used for ping.  See the ICMP RFC  
(http://www.faqs.org/rfcs/rfc792.html) for more detailed information.



> On 6/30/08, Keith A. Glass <salgak () speakeasy net> wrote:
> > Echo is a specific member of the ICMP family of protocols.  But not the
> > ONLY member. . .
> >
> > Ping is typically Echo and Echo-reply.
> >
> > Hope that clears it up
> >
> >
> > Keith
> >
> > Security Geek  * Curmudgeon at Large *  Short on Sleep
> >
> > On Thu Jun 26  6:00 , "peng liu"  sent:
> >
> > >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



--
Tim Donahue

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