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Topic: Can I control 2000s with vnc?
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 06-28-2015 03:15 PM
I think, in theory you might get away using public IPs behind a router unless you end up trying to access a site using that IP subnet. A router inherently does a NAT translation and presents "you" as its WAN IP on up the chain until you actually hit the internet. Hence, if you use the "Whats My IP" you don't see your private IP, you see the public IP of the device that is actually on the internet. Certainly, it is very bad practice.
As for IP ranges, it all depends on the screen count and devices per screen, naturally. While I typically service low-screen count theatres, my IP allotment is typically pretty high per screen. By the time you allow for all of the traditional DCinema stuff, add in A/V equipment, DSP on the sound, maybe scaler, controllers...etc. It all adds up. Even typical DCinema systems are needing more IPs than some system original planned on. ADA devices now will consume one, some booth monitors now have one and who knows what else will be coming that might need one here or there (and multiply that by screen count).
One beauty of the Dolby IP scheme was that you had a near limitless IP range. Each auditorium got its own 128 device range (even more than my complex systems have ever needed!). However a key to it was that each server had an internal router to allow one on a Theatre Network to "see" the individual auditorium networks. One also had to set up a routing table to your computer knew what gateway (server) to use to get there.
I do think any well designed IP scheme for cinemas should have the screen number in the IP address somewhere. If a tech sees the IP address of the projector, server in one screen within the complex, it should be pretty short order to figure out the rest of the complex.
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