IpV6 security, gain some and lose some
IPv6 includes the IpSec suite of security protocols developed by the IETF (InternetEngineeringTaskForce).
OTOH, an unauthorised IPV6 router connected into the network using a wireless mechanism can attempt to redefine itself as the default router
Perhaps the biggest drawback of using IpV6 scheme is that 2004 software (e.g. ICF FireWall from MicrosoftCorporation) cannot work (e.g. filtering ) on Ipv6 traffic.