My question is very simple. I can obtain a 6to4 IPv6 tunnel that I want to use for experimenting and developing on IPv6 networks.
My ONT (home gateway) has theoretically no support for IPv6. I say theoretically because I have not enough info (check for Huawei HG8245Q and correct me if I am wrong).
Anyway my ISP provides no IPv6. I have a router that I want to use behind my ONT in DMZ mode.
Question is: does the DMZ allow forwarding 6to4 packets?
I am trying to answer my own question, and the answer could be: it depends.
Basically when talking about NATs, a DMZ can be forwarded all the traffic that the main entry router can't handle. This definition includes 6to4 packets.
On the contrary, home networking devices normally work on the TCP/IP stack only. I wouldn't be surprised if a home router's firmware implementation treats the DMZ only as a special port forwarding rule, thus not supporting level-4 IPv6 packets. On the contrary of contrary, another vendor may implement a DMZ in the firewall so that "unhandled traffic goes forwarded to DMZ host".
Actual hardware is: Huawei HG8245Q and TP-Link Archer D7 or C7