Comcast has released source-code for the next-generation of IPv6 enabled home gateway device (a.k.a. home router). This IPv6 solution is based on the OpenWrt platform.
While it is very important that home gateway devices support native IPv6, particularly native dual-stack (IPv4 and IPv6 simultaneously), devices may still need to handle situations where tunnel-based IPv6 transition technology is used. Thus, Comcast extensions running on OpenWrt support cases where either IPv6 is tunneled over IPv4 using 6RD, or IPv4 is tunneled over IPv6 using Dual-Stack Lite (DS-Lite). This combined solution is used in the implementations of Comcast's 6RD IPv6 trial.
Further information can be found via the links below: