Just when I was about to wonder if anyone else was using DD-WRT with IPv6... I guess technically none yet?

Incidentally, I've spent the last few days relentlessly sorting out and getting IPv6 connection working with DD-WRT. It was an IPv6 learning experience for me too as I was completely new to IPv6. I finally have my Asus RT-N66U running on DD-WRT fully working with Unifi's native IPv6 along side 500 and 600 vlan tagging. 

Currently DD-WRT has less support for IPv6 compared to other custom firmwares like Tomato and OpenWRT, at least this is according to the web interface of DD-WRT, most of which needs to be manually configure using the command line interface and script files. But being well accustomed to DD-WRT and its extensive features, I wanted this to work. Only the big builds have IPv6 modules included, but with optware and ipkg and lots of patience, it's fully possible.

In short, here are the applications I am using:
1) rdisc6 to get ICMPv6 from ISP for the WAN interface.
2) DHCPv6 client to get v6 prefix from ISP.
3) and finally radvd to advertise that obtained prefix out to clients.

I also added and configured ip6tables for the v6  firewall.

Here are more details on my setup. Note this is a custom web interface page I included using the MyPage feature of DD-WRT for debugging and status purposes. So far it's been running really stable. No point in masking my IP addresses since they are dynamic plus I run a server.