qBittorrent I have not tried personally but I would think that if you have i2p set up on qbit already then enabling the setting “automatically add these trackers to new downloads” and add in a few open i2p trackers. Postman requires an account so unless the exact same torrent has already been posted there you won’t be able to bridge.
For Prowlarr, it’s a little more complicated. You can add Postman just like any other indexer but you then need to configure your proxy settings in Prowlarr for it to be reachable. If you are running your i2p router on the same machine you can just enter your local address (127.0.0.1) with port 4444 and it’ll connect. If your router is on a remote machine the easiest solution is to then use ssh port forwarding (autossh is handy here). Ssh forward the remote 4444 port to local and then use the same address and port. The final step is setting your ignored addresses, I have a bit of a list but the idea is to filter out all non .i2p addresses so an example would look like: *.com, *.net, *.info, …
EDIT: I should also add, if you are sticking with I2PD and are more concerned with just downloading and not incorporating the *arr suite there is a standalone Snark download that’s floating around somewhere that can plug into I2PD. I haven’t used the standalone personally but I do know that Snark is by far the most optimized client exclusively for i2p torrents. Snark is also baked into the standard i2p install by default.
Absolutely. Go to https://geti2p.net/ to get started. There are some super simple Windows installers that make everything just a few clicks. If you’re on Linux it’s built into the package managers for Ubuntu/Debian but from my experience it’s a lot better if you can get the Java source version working because then it can self update and you’ll always have the most current release.
Once it’s installed and running let your new i2p router run for a minimum of about 30-45 min to explore the network and build good connections with peers. The longer it runs the more stable it becomes but it should be usable after about 30 minutes on your first start up (subsequent start ups are a little faster after your router gets to know the network a little better). And that’s it! You’re now running an i2p router!
The only part where things get a little hard is with the proxy settings… Unfortunately there just aren’t enough active devs or funding in i2p to support a dedicated browser like Tor so this is the only side of i2p that tends to get more involved. You need to configure a browser to proxy http requests through the port used for i2p http: 4444. If the i2p router is on the same machine as the browser then it’s just a matter of entering your local address (127.0.0.1) and port (4444) into your proxy settings. If your i2p router is remote, you need to use ssh port forwarding on port 4444. Alternatively, there is a Firefox plugin that one of the core i2p devs (idk) maintains which automatically containerizes and proxies all .i2p addresses while leaving normal web traffic alone, it’s called “I2P In Private Browsing”. Only warning that the dev for that project cites is that the plugin, although open sourced, has not gone through any security auditing so there’s no guarantee that no information gets leaked to the clear web - so basically just avoid this if maximum privacy is your goal.
After your router is started up and proxy settings are configured, you’re good to go! Check out some starter sites like i2pforum.i2p to join in on i2p related discussions and development. notbob.i2p also offers a nice sortable directory of some sites hosted on i2p. Or… Host your own hidden service(s)! The standard i2p install comes with a prepackaged and preconfigured Jetty web server, just start the service from your local tunnels page and you’re now hosting a hidden website!
The possibilities are pretty much endless from here, anything that communicates on TCP/UDP can be tunneled through I2P. Which by the way is a huge advantage over Tor since Tor does not even support UDP. Unlike Tor, I2P also has a much better incentive for node operators since every user is a node, the more people who use I2P, the faster and better it becomes… A Tor node only gets spun up when someone chooses to donate their resources to the network out of the grace of their heart. This also applies to P2P downloading. In fact… It helps to grab a popular download from an I2P indexer when starting a fresh router as that helps introduce your client to new peers. Torrenting is not even an option on Tor as it is basically DDOS’S the network of limited nodes…