I keep getting asked about whether to use technology X or Y when deploying an IPv6 network, especially 'transition'/'tunneling'/'coexistence' technologies. Copypasta from a post I mate to NANOG just now. Sorry if you've read this before, but I think it'll be a useful resource for people: Instead of explaining the options over and over and hoping people can make sense of the complexities of it, become experts, and make good informed decisions, I've made a flow chart. Feel free to ask about details and I can get in to the ranting part, this is really a place to start. Right now it assumes people only provide DSL or other dynamic sort of services. It also assumes DS-Lite people are insane, so probably need better language there. Also the first question is not necessarily about who you are, but who is driving the IPv6 'build' - which is why native, 6rd and ds-lite are not appropriate for the customer-driven side. I hope that makes sense. No talk about ISATAP and stuff for inside the customer network either. And before you ask no ISATAP is not appropriate for ISPs, doesn't work through NAT. Anyway: - 6RD is used by free.fr. Not widely implemented by anyone yet. - DS-Lite is something some guys at Comcast and others are talking about. Not widely implemented by anyone yet. - The rest you can figure out from wikipedia and stuff. Please email me with any corrections, complaints, or threats if you're a DS-Lite fan. I'll always keep old versions in this directory, and the latest version will always have this filename, so please link to it instead of copying it, etc. etc.: http://www.braintrust.co.nz/resources/ipv6_flow_chart/ipv6_flow_chart-curren... -- Nathan Ward