* Brian E. Carpenter:

> the basic model for IPv6 is not fundamentally different than IPv4;
> why would the underlying security vulnerabilities be fundamentally
> different?

Lack of NAT and an expectation of end-to-end reachability seem quite
fundamentally different from IPv4 as it is deployed to day.  (I'm not
saying that NAT is a security feature, I'm just pointing to a rather
significant difference.)

IPv6 also make IPsec mandatory, which seems a significant change over
IPv4, too.
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