5 Things you need to know to Port Forward correctly

5 Things you need to know to Port Forward correctly

1. IP Addressing

What are those numbers all about? They identify devices on the network so that they can communicate with each other. The IP Address is made of two parts, the Network ID and the Host ID. The Network ID will be the same for all devices in the same network and the Host ID will be unique for all devices within a network.

2. Subnetting

If you’ve ever seen a subnet mask then you know here are a lot of 255’s in there; if not a typical subnet mask looks like this:

These numbers indicate how the network is divided to keep its traffic manageable, more traffic will slow down the network in the same way as the road system. The position of the 255’s in the mask indicate the position of the IP address that is the Network ID. The remaining numbers are part of the Host ID.

For example, if your IP Address is then the network ID is and your host address will be 42 as indicated by the subnet mask of

3. Network Hardware

Switches connect the network together and routers allow traffic to flow between these smaller networks called LANs. Other kinds of devices operate in networks but typically these two are the most common.

Each device operates at a different layer of the network. Switches operate at Layer 2 which is closest to the Cable, which is considered Layer 1. Therefore switches are considered to be more hardware oriented devices rather than the software oriented Layer 3 devices of which a Router is one. Routers have software rules they will follow to manage the traffic they receive and direct. Routers also contain and prevent the redistribution of the bulk of internal traffic. This is what allows network engineers to keep their networks small and ensure that they run efficiently.

4. Application Ports

Application Ports identify unique services and applications running on a server and to a lesser extent, workstations. These numbers are found at the end of a socket, which is an IP Address followed by the application number. For example: will be a socket. The 8080 is a commonly used web hosting port.

Knowing the correct port number is for video applications is necessary for enabling port forwarding.

5. Router configuration

Now that you have the right information it can be programmed into the router and remote client application to allow the video to exit the local network and reach the remote device through the internet. The Graphic User Interfaces on routers can be very diverse but devices with a command line interface similar to Cisco IOS are usually easy to program with some programming experience.

Would you like to know more..

If you would like a much more in-depth training on Port Forwarding why not book on to Thorrin’s Cable to Port Forwarding Training event happening in Reading on the 15th of February.

For any queries please E-mail me, Gordon info@thorrin.com

The event details are available on Eventbrite, follow the link here. Cable to Port Forwarding Training, Reading UK

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