Re: [fw-wiz] ECHO Protocol

Quoting peng liu <cleverpigboy@xxxxxxxxx>:

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 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 ( for more detailed information.

On 6/30/08, Keith A. Glass <salgak@xxxxxxxxxxxxx> 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


Security Geek * Curmudgeon at Large * Short on Sleep

On Thu Jun 26 6:00 , "peng liu" sent:

>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

Tim Donahue

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