Cjdns

Cjdns is a free and open-source routing software that allows computers to create peer-to-peer networks using IPv6. It aims to provide a decentralized, encrypted, and robust network infrastructure that can operate independently of the traditional internet. The core idea behind cjdns is to build a mesh network where each node can directly communicate with others, without relying on central servers.

One of the key features of cjdns is its use of public-key cryptography for node identification and authentication. Each node has a unique public and private key pair, and its IPv6 address is derived from its public key. This cryptographic approach enhances security and prevents spoofing. Cjdns also employs a robust routing algorithm designed to efficiently discover and maintain paths between nodes in a dynamic and potentially disconnected network.

Cjdns is often used to create private networks or to provide internet access in areas with limited or censored connectivity. It can be installed on various operating systems, including Linux, macOS, and Windows. The project emphasizes resilience and self-healing capabilities, meaning the network can continue to function even if some nodes go offline. While it leverages IPv6, it can be tunneled over IPv4 networks, making it accessible without native IPv6 support.