Recommendation ITU-T X.1037 specifies security threats raised by the introduction of the IPv6. It also provides a risk assessment related to these threats and documents the technical solutions for a secure IPv6 deployment. This Recommendation focuses on three components: network devices (e.g., router, switch), server/client devices (e.g., end nodes, DHCP server) and security devices (e.g., intrusion detection system (IDS), and firewall (FW)) that will be also deployed in an IPv6 network. Recommendation ITU-T X.1037 provides a technical security guideline to developers of network products, security operators and managers of enterprise networks that are planning to deploy IPv6, so that they are able to mitigate security threats on their IPv6 network. This Recommendation provides a security guideline focusing on IPv6 in enterprise networks. The guidelines for other environments such as home network and carrier network are outside the scope of this Recommendation.