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gray tmobile 5g gateway port forwarding
It is their implementation of XLAT464.
They aren't using anything to preserve the port assignments through their "tunnel" back into our local v4 address, breaking all manner of applications in the process.
From the introduction of RFC6877:
https://datatracker.ietf.org/doc/html/rfc6877
"This document describes an IPv4-over-IPv6 solution as one of the techniques for IPv4 service extension and encouragement of IPv6 deployment. 464XLAT is not a one-for-one replacement of full IPv4 functionality. The 464XLAT architecture only supports IPv4 in the client-server model, where the server has a global IPv4 address. This means it is not fit for IPv4 peer-to-peer communication or inbound IPv4 connections. 464XLAT builds on IPv6 transport and includes full any-to-any IPv6 communication."
Some people have been successful restoring SOME functionality through VPN's, but it is limited and hit and miss. Some providers will allow you to reserve a public v4 IP and assign a few ports for forwarding, but it costs extra to do so. May not be worth it in the end.
I was able to set up v6 passthrough on my Asus with my Askey LTE modem (their older one). In theory, that may allow more things to work--provided the applications/devices in play are v6 capable/aware.
They really didn't plan this service out well... designed more for the casual user. Don't think they even thought about people who use their internet beyond casual browsing and streaming video.
Without some form of major overhaul to their topology to more properly address the dual stack scenario... many are kinda screwed for now.
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