TP-Link TL-WR720N DMZ Proto 41

It seemed that the proto 41 for ipv6 traffic is not forwarded to the DMZ by TP-Link 150Mbps Wireless N Router TL-WR720N. This put out the hope of setting up 6to4 in my apartment. There is a slight chance that the filtering was done by the ISP. However, I had no suitable option to test this.
As it seems, the same is true for TL-WR702N.