Two security camera systems two DVR's one IP for remote viewing

LakewoodMike used Ask the Experts™

I have a customer (dealership) who has had a security camera system installed with about 8 cameras.  The DVR unit has been setup so the owner can login to the DVR and monitor the cameras remotely while he is at home in another state.  Recently they bought the building next door which they want to use as their mechanic shop.  The new building is approximately 80FT-100FT apart from the building that holds the current DVR system.  The owner called and was wanting to know if I could install extra cameras in the mechanic shop.

After taking a look at it, there is no easy way to run the cable except along a fence thats bumps up against  both buildings.  I don't think this would be allowed since I would be using RG59 cable for the BNC and power for each camera.

My advice to him was it would be easier to just install a smaller DVR with 4 channels and run a cat5 cable out to that building for their computers and the camera DVR.  He was ok with the idea.   However, now i am thinking is it even possible to use two DVR systems on one IP?  Would there be a conflict with the DVR systems?  Or could I just have each use different ports and that should work?



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You can have one external address and do port fowarding so he only uses 1 address when he outside of the network. But inside of the network each device will have to have its own address.
Port forwarding would work, but you'd have to train the users to type ":8080" at the end of the URL to forward to another arbitrary port besides HTTP port 80.

If you're running Cat5 between buildings, you've already introduced (or solved) the problem of non-current-carrying conductors between two buildings.  There are several wiring/grounding issues that need to be addressed for this to happen safely.  Otherwise it's a safety hazard and likely a code violation if you're in the U.S.

So, if you're running wire already, then why not bundle the coax into a conduit between the buildings?  PVC conduit should be fine, just take care to seal against water and/or leave a drain so you don't drip condensation on sensitive equipment inside.  Coax can run for a farther distance than Fast Ethernet.  Inline boosters can help on longer coax runs, or you can get a booster/converter to run the signal over Cat5, then reconvert to coax at the other end.

But, make sure you fix the grounding issues with connecting two buildings.  Doing it improperly can cause equipment damage and/or personnel injury.
You may be able to run coax & low-voltage power to cameras in the remote building without code violation.  As long as you don't interconnect any wiring between the two buildings, like plugging in a power supply in the remote building, with coax leading back to the home building...

But that's a question for your local inspector.  There's still the danger of someone connecting a TV or another camera with power supply and inadvertently bridging the two electrical systems.
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From all the answers it sounds like I could just use the one external static IP for both DVR systems?  Could they be viewed simultaneously?  Say if the external was like and

I just think this would be cheaper and easier when you can get a DVR with 4 cameras around $300 right now.  I was looking and RG59 cable 500' was around $90 plus four cameras would have been around the same price with allot more work.  Which means higher in the end with labor.

Aleghart, you brought up an excellent point with the grounding issue.  I will have to look into how I ground this cat5 cable so no equipment or personnel damage.  

Which i had pictures of the setup so you guys could better understand the setup.
Yes both ports can be used at the same time.
>Could they be viewed simultaneously?  Say if the external was like and

Yes, but one browser page for each DVR.  Unless you have client software that is pulling the feeds over HTTP.  But most simple DVR setups have one page for itself.  So, open two browser windows to see 2 DVRs.

You can eliminate the grounding issue by running fiber.  It cannot carry current, so would not bridge the two electrical systems.  Other than that, you're looking at a lot of expense (permits, inspection) to bond the main electrical panels together.


Pretty much answers my question.

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