The following documents explain the steps involved in enabling IPv6 on selected Cisco security appliances and firewalls. There are several families of such products, and this article does not attempt to cover them all.
IPv6 on Cisco ASA firewall describes the basic steps in enabling IPv6 on specified interfaces of a Cisco ASA firewall. (Scroll down to view the article.)
A general guide to Cisco firewall configuration is given by this Security Configuration Guide: Zone-Based Policy Firewall.
A complete reference with numerous examples and detailed explanation of the ASA and PIX firewall configuration options is available here on the Cisco website. A complete reference with numerous examples and detailed explanation of the IOS-based firewall configuration options is available here on the Cisco website. An IPv6-specific Frequently Asked Questions (FAQ) file is maintained by Cisco. Cisco maintains a Small Business Support Community for its equipment.