On Thu, Jul 17, 2014 at 11:23 AM, Baptiste Jonglez <[email protected]> wrote:
> ... without having to explicitely configure your firewall.

And this is the opinion that I, and many others, disagree with.

I look at it from the principle of minimizing the worst case scenario.
We could allow all (or some, like ports >1024) incoming traffic by
default; the worst case scenario is that the user's machine gets
compromised.  We could deny all incoming traffic by default; the worst
case scenario is that a peer-to-peer service—which not all users
actually use—doesn't work until the user opens up their firewall,
either manually or by enabling UPnP/NAT-PMP/PCP.  IMO, the latter is
the the much less costly scenario, and follows the best security
practice of deny-by-default, IETF RFCs notwithstanding.

-- 
Soren Harward
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