protecting username/password across the unsecure net

[jnb @ ptech . com (Jimmy Brown)]

I suspect this has been discussed in extreme detail, but I am
new to the list so I'll ask anyways.  :>

I know how to allow specific unsecure sites telnet access
to my firewall.  The problem of course is, that they will be
passing their username/passwords across the unsecure net
for anybody to sniff.  What are ways to address this
and where do I go for more info?  Are there any commercial
products that provide this?

What is the best way to encrypt TCP/IP traffic between one
site and another on the Internet?  Essentially I want
to tunnel all traffic coming out of one site bound
for another site into an encrypted stream to provide
some modicum of security.  Is this feasible?

Thx for any suggestions.

Jimmy
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___jnb___