Subsequently this support was somewhat weakened when IETF
IPv6 security architecture downgraded the requirement for the support
of AH from MUST to MAY. The mandatory support for IPsec in
IPv6 has sometimes been interpreted, though incorrectly, to mean that
IPv6 is more secure than IPv4. In reality the use of IPsec is equally
available for both protocols So that a consensus view today is that
IPv6 is neither more secure nor less secure than IPv4. Depending
upon how seriously one regards the new IPv6 specific security vulnerabilities,
some researchers might argue that IPv6 is less secure
than IPv4.