Disadvantages of Double NAT setup?

I use at AT&T Fiber router.  It has its issues with using IP Passthrough.  I’ve been running in “double NAT” mode for about a year and everything seems to work fine.  I’m leveraging euro Secure and no problems.

What are the disadvantages of Double-NAT vs going back and setting up the AT&T router to passthrough so that I’ll have a single NAT setup?



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