I know you know about this, but with a firmware update in the last 60 days, you broken IP Passthrough. The setting worked perfectly for almost 2 years. There was clearly no or very shoddy testing on the recent firmware upgrade, which is really quite shocking for a network provider in the tradition of Bell Telephone. I don't expect any resolution since no one else seems to be getting this issue fixed, but I'm beyond frustrated. The setting is broken in a very basic way: when you enable the option in the Network settings, the checkbox to indicate that it is set won't even "stick": it unchecks itself, but the setting is partially enabled and will work for maybe a couple of hours before breaking. But because the checkmark won't stay, you also can't disable it.
What happened to you guys?