Port forwarding

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In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall. This technique is most commonly used to make services on a host residing on a protected or masqueraded (internal) network available to hosts on the opposite side of the gateway (external network), by remapping the destination IP address and port number of the communication to an internal host.
Opening port 6325 is a good way to contribute to Neblio. This will not impact staking in any way. But by not forwarding the port you consume some of the connectable peers without providing more. With fewer peers to connect to, new peers cannot easily connect to the network.

In short:
port 6325 closed = non listening node, connections are only initiated by your device (16 max)
port 6325 forwarded = listening node, allowing incoming connections, best for the network.

Steps to forward a port

Follow these steps in order to open port 6325 on your machine.

  1. Setting up a static ip address. For Mac and Windows machines. For Raspberry Pi
  2. Login to your router
  3. Navigating to the port forwarding section
  4. Create a TCP port forward entry for port 6325

All these steps are explained for each router on PortForward.com. Or use a general guide.

To check which ports are open you can use the command netstat -anput.