The IETF has just published RFC 6274, entitled “Security Assessment of the Internet Protocol Version 4”. It contains a large amount of information on how to improve the security of IPv4 implementations and IPv4 deployments.
You can download it from the following link: https://packetstormsecurity.com/files/download/102839/rfc6274.txt
Source: https://packetstormsecurity.com/files/102839/RFC-6274-Security-Assessment-Of-The-Internet-Protocol-Version-4.html