June 11, 2015
We added a new building to our company and have two 16 cam dvrs. For awhile it had a separate IP address and port forwarding wasn't an issue for remote viewing. We have now switched to a PTP setup and both buildings are now running off one IP. With these change the DVR at our main building is still working fine on and off network for remote viewing. The Annex building however can be viewed on network but not off.
The main building is set to 192.168.1.112 with ports 88, 37777, 37778 forwarded. I need to know what ports I can set for the Annex. I'm using a Cisco 1921 router.
June 11, 2015
So help me understand this a bit better. You have one building with a router or maybe a router/modem combo where you have the ISP connection. Then, in your second building you have another router that is P2P with the main buildings router/modem? If this is the case you will need to forward ports in both routers if I am not mistaken. From what I gather both buildings are now on the same network, is that correct? When you have 2+ DVR's/NVR's on the same network they need to be set with different ports. For Example, DVR1, HTTP is 88, TCP is 37777, and UDP is 37778. Then, DVR2 is HTTP 99, TCP 47777, and UDP 47778. Hope I got close to answering your question, please let me know if there is anything else I can do for you. Thanks.
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May 15, 2015
If I am reading this correctly, it looks like a double NAT situation. As Heath mentioned - if you have two routers between the DVR and the Internet, you have to forward ports for the Annex DVR from the main router to the Annex router - then port forward the Annex router to the DVR. Port Forwarding has to be done in 'daisy chain' fashion from router 1 to the next router and the next router, until you get to the router that the DVR is connected to. That last router gets ports forwarded to the DVR.
Lets say you have a DVR at 192.168.1.108 that is connected to a linksys at 192.168.1.1, but you also have a comcast modem at 10.1.10.1 that the linksys WAN port plugs into. The linksys will have a WAN address on the 10.1.10.x , and it will also have a LAN address of 192.168.1.1 which is where your DVR gets 192.168.1.108.
So go to the comcast modem, forward your 2 ports in it to the WAN IP of the linksys, then log into the linksys and forward your 2 ports to the IP of the DVR.
Make sure that the Linksys router has a static WAN IP from the comcast modem or if that IP changes you lose your remote access completely.
Let me know if you have any further questions. Thanks.