dsl and the confusedness the howto brings about various protocols

[Kirk Wood]

IP spoofing can also be used for a broader distributed DOS attack. And as
pointed out, all of your services to the internal network are possibly
invaded from the outside. With two cards, you can stop this and more
completely stop internal services from being available to external devices
via spoofing.

-- 
Kirk Wood
Cpt.Kirk at 1tree.net
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Seek simplicity -- and distrust it.
		Alfred North Whitehead