Im not aware of it, that it should be possible to see in gui.
Its been a while since i did my own dashboards, so not 100% sure if it would be possible there.
so cli: show nat pool is problably the only option.
i have made a python scripts that connect cli to ftd and show nat pool and save the data. Then i integrate that with a grafana instance to have my own visualization of nat pool.
But be aware of bug CSCvr09468.. I think the bug hit 6.6.x also, so your instance reboot with the show nat pool command.
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/ Carsten
