You should be able to do this with the networking scripts in the /etc/sysconfig/network-scripts depending on your ISP's setup regarding this.

Your other option is to use ipv6.he.net's tunnel broker services and installing radvd.

For what it's worth, you'll need to upgrade to ClearOS 5.1 as there were kernel/routing issues with earlier versions. I could not get routing to work properly without lots of aggravation with CC 4.2 or CC 4.3

If your ISP is handing out a ::/64 net to you then you're golden and radvd should allow you to accomplish the 3 things you are asking about. If not, the he.net tunnel broker services will be your best bet. Depending on how many boxes you have on your internal LAN, it may be quicker and easier to manually set up the internal addresses and forget radvd.

Bear in mind that you will have to firewall the router/ClearOS system as your internal boxes will be available ipv6-worldwide if you give them routable addresses

Hi clikwir,

None of the core developers have put much thought into IPv6 support. Having said that, most of the underlying software stack has at least partial IPv6 support. It's certainly something that I'm personally keeping an eye on!