Looks like I'm going to My netgear router to tomato or dd-wrt
The current software has a dynamic dns setting, but it's a dropdown and Dyn DNS is the ONLY option. I hope they release a new firmware relaxing this restriction, but I have not seen any updates in a few years for my model.
Effectively, they are taking away functionality that I have already paid for. Sony did this when they made us choose between PSN (and effectively any internet communication) or Custom Operating System, changing the terms of our original purchase.
Thank god for open source. But, I wasn't looking forward to this side-quest. I'm sick of things I own ceasing to work just because some external entity wishes to make it so.