Hello to all,
I've got a small premise which I would want to manage its electrical consumption remotely.
For that, I decided to use a TL-MR6400 connected though a French LTE provider (Free) that enables IPV6.
Connected to one of its Ethernet ports, there is an energy meter that furnishes a micro web server accessible by a fixed IPV4 address (192.168.1.249).
Unfortunately, I realized that factory MR6400's firmware can't do any kind of "translation" from an IPV6 to an IPV4. Sorry for my vocabulary misuse but one internet search to another I learned a lot. And then a new hope come almost true by discovering Openwrt 
As I understand, a "web server on a IPV4 LAN <------> IPV6 WAN" is the kind of situation that Openwrt could manage ? 
Thanks a lot in advance for your valuable help.
While you can't really 'translate' between IPv4 and IPv6, you could run a VPN tunnel (e.g. using wireguard) over IPv6, which then gives you access to IPv4 over the tunnel.
And note that many Mobile operators filter all incoming connections...
But a simple webserver able to reverse proxy can do this.
I only know of nginx or haproxy or apache to do this but all 3 are quiet large so these do not fulfill the need of being micro...
Hello to all,
thanks a lot to all for your reply. It seems that this story isn't simple as I thought...
About running a VPN, I guess this is possible on Openwrt.
In my case, would you have some concrete example that could apply ?
Here the famous counter:
I'm not a network specialist but a Linux enthusiast
Thanks a lot in advance.