From: John Pritchard-williams <monojohnny@...>
Date: 2008-08-30T00:51:35+09:00
Subject: Re: Ping.pingecho

john maclean wrote:
> Cisco.com don't normally allow pings so tracroutes and pings won't get
> echo requests.
> 
> 
> irb(main):003:0> Ping.pingecho('cisco.com', 10, 80)
> => true
> 
> How come this works and `ping` does not? From irb I see that Ruby's
> ping uses a TCP echo. Also I've run tcpdump whilst running ping.echo
> and could not determine the port that it uses. What port does Ruby's
> Ping use?

check out:

http://www.noobkit.com/show/ruby/ruby/standard-library/ping/pingecho.html

According to this the 'echo' port.

grep'ing 'echo' in my /etc/services reveals this is port 7...apparently. 
(UDP and TCP).



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