feat(guide): Add information to the port forwarding guide (#2074)

docs/Downloaders/Deluge/Port-Forwarding.md

@@ -1,15 +1,17 @@
 # Port Forwarding
 
+--8<-- "includes/downloaders/port-forwarding.md"
+
+---
+
+## Client settings
+
 The `Network` section of `Preferences` is where you will bind Deluge to a specific interface/address, and specify port usage.
 
 ![!Network Settings](images/Deluge-port-forwarding.png)
 
 ## Incoming Port
 
-!!! info ""
-
-    You've followed the [Setup TorGuard for port forwarding](/Misc/How-to-setup-Torguard-for-port-forwarding/){:target="\_blank" rel="noopener noreferrer"} and want to know where in your download client you should add the port you've forwarded.
-
 `Incoming Port` should be set to a specific port that you have opened/forwarded (if you are behind any NAT/Firewall/VPN.)
 
 !!! WARNING

docs/Downloaders/qBittorrent/Port-forwarding.md

@@ -1,10 +1,12 @@
 # qBittorrent - Port forwarding
 
-!!! info ""
+--8<-- "includes/downloaders/port-forwarding.md"
 
-    You've followed the [Setup TorGuard for port forwarding](/Misc/How-to-setup-Torguard-for-port-forwarding/){:target="\_blank" rel="noopener noreferrer"} and want to know where in your download client you should add the port you've port forwarded.
+---
 
-`Tools` => `Options` => `Connection`
+## Client settings
+
+`Tools` => `Options` => `Connection` is where you will find the settings to which port the download should use.
 
 ![qbt-pf-connection](images/qbt-pf-connection.png)
 

includes/downloaders/port-forwarding.md

@@ -0,0 +1,30 @@
+<!-- markdownlint-disable MD041-->
+## Why port-forwarding
+
+To seed content effectively, it is necessary to have some form of port-forwarding enabled.
+This can vary depending on whether you use a VPN or not and/or what router or firewall
+you have.
+
+### How to port-forward
+
+=== "VPN Service"
+    Please consult your VPN Service and/or your VPN container documentation for specifics.
+
+    For Torguard we've created instructions on how to [setup port-forwarding](/Misc/How-to-setup-Torguard-for-port-forwarding/){:target="\_blank" rel="noopener noreferrer"}.
+
+    #### How to Check if Your VPN is Working
+
+    Download one of the test .torrents or magnet links from one of the following sites:
+
+    - [ipleak.net](https://ipleak.net/){:target="\_blank" rel="noopener noreferrer"}
+    - [TorGuard's “Check My Torrent IP”](https://torguard.net/checkmytorrentipaddress.php){:target="\_blank" rel="noopener noreferrer"}
+
+    Add the magnet link to your torrent client and wait for the results. It should show you a different IP than your WAN IP number. Remember this IP because you will need it to [check if your port is open or closed](#how-to-check-if-a-port-is-open-or-closed).
+
+=== "Router"
+    Please consult your router manual for specifics or check if your router can be found on [Port Forward](https://portforward.com/router.htm){:target="\_blank" rel="noopener noreferrer"}.
+
+#### How to Check if a Port is Open or Closed
+<!-- markdownlint-disable MD051-->
+Use the free online [Open Port Check Tool](https://canyouseeme.org/){:target="\_blank" rel="noopener noreferrer"} to check if your port is open. If you're using a VPN and have forwarded your port with the VPN service, then use the IP you got from [How to Check if Your VPN is Working](#how-to-check-if-your-vpn-is-working) and the port you used to forward. If you're not using a VPN service, use your WAN IP address and the port you used to forward.
+<!-- markdownlint-enable MD041 MD051-->