[ale] OT: What port does Ping (ICMP Echo) Use?

[Jerald Sheets]

RFC 792 is a "must read" for you.

http://www.faqs.org/rfcs/rfc792.html

Ping is in it's own world.  While it uses the TCP/IP stack, it has its
own specil function called "echo".  Echo doesn't function on a port, but
at an integrated low layer of the stack.  RFC 792 says it much better
than I ever could...have a looksee.

Also, Ethereal, and Network General's Sniffer as well as TCPDUMP, NA
Sniffer, etc.  All recognize a ping as "ICMP echo", and this is how you
will see them in your trace.  You can even set filters to only show ICMP
echos on the segment you are sniffing.

Hope that helps.

--JMS

-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
griffisb at bellsouth.net
Sent: Thursday, May 13, 2004 10:34 AM
To: ale at ale.org
Subject: [ale] OT: What port does Ping (ICMP Echo) Use?


Okay, I should know this. Or, I should open up ethereal and set
port-forwarding on my switch, so please pardon my laziness. Anyone know
what port and protocol Ping uses? I looked it up and saw TCP port 7 and
UDP port 7, then saw something else regarding ICMP Echo. 

So, any of you capture a ping? What port and protocol does it use?

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