[ale] Proxy Servers and Firewalls

[jhubbs at telocity.com (Jeff Hubbs)]

I know that proxy servers and firewalls (with or without NAT) are common
means of connecting a LAN to the Internet.  I seek a cross-platform take
on which to use under what circumstances.  Specifically, under what
circumstances is it highly desireable to use a proxy server instead of a
firewall, and under what circumstances is it highly UNdesireable?

- Jeff
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