I have two apparently identical EE sims in two apparently identical modems, with apparently identical settings, and with each modem being connected to an identical linux PC. Both PCs, by default, use IPv4v6 configuration.
Both systems are located in the same place.
One of these modems registers onto the network and receives both an IPv4 address which works fine
The other registers on the network and always obtains only an IPv6 address .Checking this IP, it is owned by BT/EE (as expected)
If I explicitly tell the second modem to request an IPv4 address, that modem doesn't get an IP at all.
However, I can't route any traffic over the IPv6 connection - even pings to public addresses fail. EE have checked and told me there is no block on the SIM itself - can anyone suggest anything else that might be going on here?
What seems very strange is that everything _seems_ identical....but one setup _always_ gets IPv4 (and works fine), the other does not....
