sniffing plaintext protocols

Hi

The background for the following questions is purely due to feasibiltiy
reasons for pentests and there is no interest in hacking.

I have read many articles about sniffing, spoofing and relaying.
So far I learned that it is possible to connect a host, hostA, between two
existing hosts, host1 and host2, in order to sniff e.g. plaintext protcols
like telnet, pop3, and ftp.

1)
Is this only in a local network possible or also in the Internet?

2)
I would lik to test such a scenario in my private local network in order to
prove myself and my team, that this is really possible.

Can anybody provide me a kind of how-to for this scenario.
I run different linux machines on my local network and on hostA I have various
tools installed like dsniff, hunt, fakerout, P.A.T.H, wireshark, etc.

--
Any help is very much appreciated.
Regards,
Mike

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