I downloaded TinyCore-current.iso and installed it into a qcow2 image using qemu by following the instructions at brezular.wordpress.com/2011/01/26/how-to-setup-linux-microcore-3-x-router-qemu-image-in-fedora-linux-part1/
and then I installed ipv6 using
tce-load -i -w ipv6-3.0.3-tinycore.tcz
Now when I do modprobe ipv6 I am getting the error
modprobe: module ipv6 not found in modules.dep