Instalaciones Eléctricas

“How to install multiple cameras behind a router and be able to access them
remotely using one single public IP address”
It is very common in video surveillance to have to access cameras in aremote location for visualization
or recording. It is unpractical to assign a public IP to each camera as this would create constant added
costs, so we are faced with the problem of monitoringmultiple cameras with one single public IP. This
public IP is provided by your internet company and can be dynamic or static.
Here are some guidelines on how to configure your network so that you canvisualize the cameras from
outside your network:
1) Your router must support port forwarding from a WAN port to a LAN port. In order to configure
this you must have administrative credentials foryour router.
2) If the public IP assigned by your internet provider is dynamic, then it is recommended to get a
dynamic DNS account for your router so that it can be accessed always.
3)Grandstream cameras use port 554 by default to transmit audio and video (RTSP)
4) The default HTTP port is 80. This port is used to display the web interface, but remember that
port 554 is the one thatcarries video, so when you bring up a camera on your browser you must
have ports 80 and 554 open.
5) When the HTTP port is changed from its default value of 80, the RTSP port value will alsochange. The new RTSP port will be 2000 + the new HTTP. For example, if the HTTP port is set to
81, then the RTSP port is set to 2081, if the HTTP port is set to 82, then the RTSP port is set to
2082,if the HTTP port is set to 83, then the RTSP port is set to 2083 and so on.
6) Remember that if we want to see a camera from outside the network using GSURF, we only
need the RTSP port open as weare only interested in the video and audio.
Here is an example of a typical scenario where the installer wants to allow the customer access to his
cameras remotely. This is particularly useful...