NixOS/nixpkgs — pull request #3158 by wkennington (2014-07-02 05:47:12+00:00)
Title: radvd: Update to 1.13 and Convert to a Systemd Unit

Additionally, allow the end user to configure how they want ipv6 forwarding enabled on their own devices. Don't force the preStart to enable ipv6 forwarding for all interfaces.