I2P

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I2P
is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties. Many applications are available that interface with I2P, including mail, peer-peer, IRC chat, and others.
Two implementations of I2P are as follows:
I2P
— Written in Java. First development. Most interactive and user-friendly web user interface and features, has a built-in client of email (SusiMail) and torrent (I2PSnark).
i2pd
— Alternative development. Does not require Java, is written in C++, consumes less memory and CPU.
More, less stable, clients are listed on the i2p website
[1]
.
I2P (Java suite)
Installation
The standard I2P suite is available with the
i2p
AUR
and
i2p-bin
AUR
packages. Both require a
Java
Runtime Environment. A recent Sun/Oracle Java or
OpenJDK
version with "mixed mode" support is recommended, "interpreted mode" could result in performance degradation, check with "java -version".
The I2P homepage also provides a
pre-compiled binary
which includes command line (headless) option and can be installed in the user's home directory. Such an installation will auto update through the i2p network with signed zip packages directly from the i2p developers.
Usage
Start/enable
i2prouter.service
in case of
i2p
AUR
. For the pre-compiled binary, run
i2prouter
in a terminal and see the available options.
Open your browser of choice and visit the I2P welcome page at
127.0.0.1:7657
for the suite (see the
FAQ
). 
From here you can navigate to I2Ps configuration and statistics pages, and links to
Eepsites
.
Also, be aware that eepsites are unavailable until the daemon has bootstrapped to the network, which can take several minutes.
In order to visit eepsites configure your browser to use the local proxy:
HTTP  127.0.0.1 4444
Eepsite
To make an eepsite, follow the I2P
instructions
, but keep in mind that the home directory will apply to the i2p user whose home directory is
/opt/i2p
as shown in the AUR
i2p.install
file.
i2pd (C++ Alternative)
Installation
Install the
i2pd
package for the daemon written in C++ which may suit hardware with limited resources or
i2pd-git
AUR
for the development version.
Usage
Start/enable
i2pd.service
.
The configuration is made in
/etc/i2pd/i2pd.conf
.
Open your browser of choice and visit the I2P welcome page at
127.0.0.1:7070
In order to visit eepsites configure your browser to use the local proxy:
HTTP  127.0.0.1 4444
SOCKS 127.0.0.1 4447
i2pd has no built-in email client, filesharing or webserver for Eepsite. See the How-To / Tutorials in
upstream documentation
for more details, also for chat servers, XMPP / Jabber or RetroShare.
Eepsite
Tools required to register your site on http://reg.i2p/add and/or http://stats.i2p/i2p/addkey.html are included in
i2pd-tools-git
AUR
, see the
readme
for usage documentation.
Troubleshooting
Firefox: wrong redirect to a search engine
After entering an i2p page, e.g. "zzz.i2p" Firefox will try to redirect wrongly to duckduckgo.com or www.google.com.
Since most i2p does not provide https, enter your address always explicit with the http protocol prefix, e.g. http://zzz.i2p/
Alternatively, navigate to about:config and create a new boolean config variable named
browser.fixup.domainsuffixwhitelist.i2p
and set its value to
true
.
See also
I2P FAQ
I2P on Wikipedia
I2P Homepage mirror
i2pd daemon homepage
i2pd documentation