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Originally Posted by Best Coder 2014
Translated directly by Google Translate, taken from the FAQ section of my ISP's website under the entry "I can't access my NAS server from the Internet":
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Yes, you confirmed what I just said.
They will allow you to purchase a static IP so that users can connect to you from outside your network regardless of how many times you connect. That has literally nothing to do with port forwarding which is a configuration setting on your fucking router.
Port forwarding - Wikipedia, the free encyclopedia
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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.
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Your router is the gateway to your internal network. Port forwarding is simply a rule on your router that states "when something connects to me on this port, forward it to this internal computer". It has nothing to do with your internet, it has nothing to do with your ISP.
You could not have an internet connection at all and you could still set up port forwarding on your router. Sure there'd be no incoming connections for it to forward but it would still be port forwarding and it would be no less functional then if you were online at the time.
For a visual example - Here's my router.
[Only registered and activated users can see links. Click Here To Register...]
If anyone tries to connect to my PUBLIC ip address (provided by my isp. Could be dynamic, could be static, hell they could filter and block the traffic all they want based on my contract with them) on ports 9958, 5185 or 9528 it will forward it to my server machine which is running the local IP address 192.168.1.132
These settings are completely independent of what ISP I'm using and what my public IP address is. If my public IP address changes then sure, people will need to update their client to use my new public IP address but it doesn't have any impact on what my port forwarding settings would be.
I could assign a local (192) address inside windows so my server machine never changes its local IP or I could assign the IP permanently from router based on HWID or any other setting my router allows for. Still not related to ISP or internet connection in any way though.