Fortigate
From Federal Burro of Information
some quick ref command i ncluding debugging packet flow. http://docs-legacy.fortinet.com/cb/html/index.html#page/FOS_Cookbook/Install_advanced/cb_appendix_diags.html
HE ipv6 tunnel with foritgate https://www.sixxs.net/wiki/Fortigate
http://docs.fortinet.com/uploaded/files/1587/fortigate-ipv6.pdf
Supplementary Recipes http://docs-legacy.fortinet.com/supplement.html