After running the installer on windows, simply click on the "Start I2P" button which will bring up the router console, which has further instructions.
On Unix-like systems, I2P can be started as a service using the "i2prouter" script, located in the directory you selected for I2P. Changing to that directory in a console and issuing "sh i2prouter status" should tell you the router's status. The arguments "start", "stop" and "restart" control the service. The router console can be accessed at its usual location. For users on OpenSolaris and other systems for which the wrapper (i2psvc) is not supported, start the router with "sh runplain.sh" instead.
When installing for the first time, please remember to adjust your NAT/firewall if you can, bearing in mind the Internet-facing ports I2P uses, described here among other ports. If you have successfully opened your port to inbound TCP, also enable inbound TCP on the configuration page.
Also, please review and adjust the bandwidth settings on the configuration page, as the default settings of 96 KBps down / 40 KBps up are fairly slow.
If you want to reach eepsites via your browser, have a look on the browser proxy setup page for an easy howto.
Your web browser will need to be configured in order to browse web sites on I2P and to utilize the outproxies available within I2P. Below are walkthroughs for some of the most popular browsers.
Firefox Profile for Windows
If you are using Windows, the recommended way of accessing I2P is using the Firefox profile.
If you do not wish to use that profile or are not on Windows, you need to configure your browser yourself. Read below on how to that.
How to configure your browser
Instructions for Firefox 57 and above:
From the Menu button in the top right, select Preferences. Scroll down until you see the Network Proxy section, as shown in the screenshot below. Click on Settings
In the Connection Settings pop-up, select Manual proxy
configuration. Set both the HTTP and SSL Proxy to address
127.0.0.1 with port
4444 as shown in the following
Finally, go to the address about:config and find the property media.peerConnection.ice.proxy_only. Ensure that this setting is True.
Chromium-Based Browsers like Chrome have slightly different places for their proxy settings depending on variant and platform. These instructions may be slightly different in Brave or Iridium, for instance. From the Main menu, navigate to the Settings, and search for the menu item. Clicking it will open the right settings for your platform.
On Windows, this button will launch you into the shared proxy settings used by Internet Explorer, and you can configure it by following the Internet Explorer 8 guide.
In the start menu search for the the "Network and Internet Settings" to open the settings. The last entry in the menu is the Proxy Settings, click it to your proxy to connect to I2P.
Now set the checkmark at "use a proxy server for your LAN" and at the "Bypass proxy server for local addresses". With a click on Advanced-button you open the window to open the ports. Enter the values like on the picture, IP 127.0.0.1 and port 4444 for HTTP, port 4445 for HTTPS. With clicks on OK you save the settings and your browser is set to use the I2P proxy.
Outproxy Terms Of Service
Remember: I2P was not designed for creating proxies to the outer Internet. Instead, it is meant to be used as an internal network.
The I2P project itself does not run any proxies to the Internet. The only outproxy is a service from the privacy solutions project. Consider donating to them for a continued stable service. Increased funding will allow them to improve this service.http://privacysolutions.no
By default, I2P comes with two outproxies configured:
outproxy-tor.meeh.i2p. Even the domain names are different, it's the same outproxy you hit.
(multi-homed/keyed for better performance)
Filtering is active on these outproxies (for example, mibbit and torrent tracker access is blocked). Eepsites that are accessible via .i2p addresses are also not allowed via the outproxies. As a convenience, the outproxy blocks ad servers.
Tor is a good application to use as an outproxy to the Internet.