Now IPv6 is finally here. Instead of the “mere” 430 billion IP addresses possible with IPv4, we will now have a seemingly unfathomable 340 undecillion (340 times 10 to the 36th power) addresses. The new Internet protocol will have plenty of room for growth…and then some. IPv6 is about more than just expanding the available pool of IP addresses, though. IPv6 also incorporates security in ways that IPv4 does not. When IPv4 was developed, security was not a primary consideration, so things like IPSec were included as optional elements. In IPv6 IPSec is mandatory, so each individual data packet is encrypted and authenticated..IPSec is apparently just encouraged now.