That’s impossible. DMZ means port frowarding all incoming connections to one (and only 1) specific IP in the LAN. @daniel.m.tripp has more cameras.
DMZ is configurable in the router via router admin access, so if one camera could do it, it has to know the credentials (hopefully not admin/admin 
), plus it has to know in what men setting is this function placed - this is different on all brands.
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