Cisco SB WRVS4400N

Looking at a Cisco 831 and things on eBay, I stumbled upon the Cisco SB WRVS4400N router. In the last minutes I learned that SB stand for "small business" and is the former Linksys product line. That means probably no IOS, which is not necessarily a bad thing, and more or less a consumer device, although apparently an advanced one. And - tadah! - it speaks IPv6. Perhaps this is what I have been waiting for. Has wireless with up to 4 SSIDs. (Why that many? Two would have been plenty.)

According to user reviews at tom's hardware it is packed with options, but configured through a web interface. So really no IOS. Cisco says it speaks IPv6, fine. Also RIPv1 and RIPv2, but RIPng is not mentioned. Can it use more than a flat /64 on the inside? Can it make services reachable from outside? There is a "DMZ" feature mentioned, so there is some hope for the latter. Also a firewall and IDS, which is good.

Cisco has the full documentation on their web site, good. User guide says it can do router advertisments. "IP mode" can be IPv4 and Dual Stack. No IPv6 only; I could live with that. But then it gets really weird: In the user guide it looks like the device cannot speak native IPv6 over PPPoE on the WAN side; there is only mention of 6to4 tunneling. WTF?

The FAQ and Troubleshooting sections of the manual do not include anything about IPv6, but about Unreal Tournament and Half-Life. That's the spirit.