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.@ 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 network. The guideline for other environments such as home network and carrier network are out of scope in this Recommendation.