I would like to pass IPv6-in-IPv4 packets (IP protocol 41) back to Cisco router that sits behind my Verizon 5G Home Internet Gateway (model LVSKIHP). I don't want to put the Verizon gateway into bridged mode because I'd lose the wireless AP functionality.
I've set the DMZ setting to point to the IP of my Cisco router, but it's not getting the protocol 41 packets. I would like to have these IP protocol packets be NAT'd by the Verizon gateway to my Cisco router IP (my LAN IP).
This is not possible. Protocol number 41 is not an option in port forwarding page, so the iptables will drop all these packets as illegal.
You can use GRE tunneling, however. IPv4 - GRE header (47) - IPv6.
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