Comcast has now released additional free open source software that may help facilitate the industry's and end users' transition to IPv6. We are releasing home gateway device (a.k.a. home router) software, which is available here as open source, developed in conjunction with Xavient Information Systems. While it is very important that home gateway devices to support native IPv6, devices may still need to handle situations where tunnel-based IPv6 transition technology would be used. Thus, this software release supports cases where either IPv6 is tunneled over IPv4 using 6RD, or IPv4 is tunneled over IPv6 using Dual-Stack Lite. More information is available on the Comcast IPv6 Information Center.