What happens if i forward all ports

Check out our web server vs. Zack is a former G2 senior research analyst for IT and development software. He leveraged years of national and international vendor relations experience, working with software vendors of all markets and regions to improve product and market representation on G2, as well as built better cross-company relationships.

This data enabled thought leadership initiatives around topics such as cloud infrastructure, monitoring, backup, and ITSM. Explore Topics Expand your knowledge. Curated Content Your time is valuable. G2 Community Guest Contributor Network. Sales Tech All Topics. Subscribe and never miss a post. G2 Community Interested in engaging with the team at G2? What is port forwarding? Before we dive too deep, let's define it. Port forwarding defined Port forwarding, sometimes called port mapping, allows computers or services in private networks to connect over the internet with other public or private computers or services.

Zack Busch. Recommended Articles. Tech What Is a Podcast? Never miss a post. Subscribe to keep your fingers on the tech pulse. The responses are sent back to your router, which knows where the request came from and responds back.

Internally, nothing is different. You would access your Raspberry Pi through its internal IP address on port Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. What happens to other computers on a network when you forward a port? Ask Question. Asked 4 years, 9 months ago.

Active 4 years, 9 months ago. Viewed 6k times. Improve this question. Hadrian Hughes Hadrian Hughes 13 1 1 silver badge 5 5 bronze badges. You should be fine, don't worry, you forwarding incoming port to the local network, it will not effect internal network in no ways — Alex. Add a comment. Active Oldest Votes. In order to answer this, you need to know how network traffic works between a client and server.

When you have a client-server program, the server sets up a listening port. So if you have 3 raspberry pi's, each having their own ip address, you could setup 3 rules: - port to pi1, port 80 - port to pi2, port 80 - port to pi3, port 80 A client then connects to your public ip appending to open that port instead, and all still works.

Improve this answer. Should it be port 80 on the router or should the router use some other port which then forwards to port 80 on the Pi? That depends. If there is no other server in your network that you really want port 80 to be using, you will likely want to use port If not, and you start using a domain name in the future such as example.

You will also need to appreciate the difference between internal and external IP addresses and internal and external ports. The combination of IP address plus port is known as a socket. As an example. Imagine sitting on your PC at home, and you have two browser windows open. One looking at the Google website and the other at the Yahoo website. Client port numbers are dynamically assigned and can be reused once the session is closed.

The IP addresses on the Internal network are private addresses and are not routable on the Internet. The ports used by NAT are normally randomly assigned which is OK when the session is initiated from the Internal network.

However if you want, for example, to host a website on your internal network and that website needs to be accessible to external clients then you will need to use a standard port port 80 for http as the external client expects this. Before you setup port forwarding you will need to configure a static IP address for the Internal device.

This step is important as the forwarding will be set to send packets to a specific internal IP address. Depending on your Application you may need a list of ports that need to be available from the the external network i.

Internet and forwarded to the internal network. Regardless of exactly how you configure it, as it varies by device, what you are essentially doing is creating a mapping table that maps an external address and port to an internal address and port.

This video shows how to configure port forwarding on a BT Home Hub. This video shows you how to set it up on a Linksys router. It also shows you how to set a static IP address for your machine. Once you have forwarded the ports you may want to check that they are really open using an open port checker. To connect to the forwarded port from the Internet you will need to know the external IP address of the Router and the Port number that has been forwarded.

Therefore when using port forwarding you might also what to consider using Dynamic DNS. The application connects to the designated trigger port on the router which tells the router to open an specific port for inbound traffic.

You may have noticed that your games work OK on the Internet even though you have not configured port forwarding. The screen shot below is taken from my router and shows a standard port forwarding rule and one setup automatically using UPnP. Using UPnP is considered insecure and to be avoided if possible. However most routers come with UPnP enabled by default. Port forwarding Maps external IP addresses and ports to Internal IP addresses and ports allowing access to internal services from the Internet.

It is configured on home routers and it is necessary because home routers use NAT which isolates the home network from the Internet. A- No the external port is mapped, and not the external IP address. A- It depends on the application. You need to check which ports the application uses. Q- How do I know if my device has a static address or a dynamic one?

A- You need to know what port the service you want to use is using. However most home routers will have a list of common games and applications and you just need to select it and it will automatically select the ports.

A- You can use an online port forwarding checker to check that the ports are open. Devices that perform strict or moderate can affect Gamers on Xbox.