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Cjdns logo.png
Original author(s)Caleb James DeLisle
Initial release23 January 2012
Written inC++
    Operating systemLinux, Illumos, OS X, FreeBSD
    Platformx86, amd64, MIPS, ARM, PowerPC
    Size2 MiB
    Available inEnglish

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    Cjdns — implements an encrypted IPv6 network using public-key cryptography for address allocation and a distributed hash table for routing. This provides near-zero-configuration networking, and prevents many of the security and scalability issues that plague existing networks.[1]


    The Internet is built on protocols which largely date back to the late 80's or earlier. At a time when it was a network of anarchistic academics and scholars showing the ITU that open standards matter, it was absolutely enough. Over time the network has gotten bigger and the users have found new needs.

    In the age when packet inspection is universal and security breaches are commonplace, cryptographic integrity and confidentiality are becoming more of a requirement. The US government recognized this requirement and has been helping through IPSEC and DNSSEC efforts.

    Another issue is how are we going to route packets in a world where the global routing table is simply too large for any one router to hold it all? Despite the heroic efforts of core network engineers, the growth of the global routing table seems an unstoppable march. Cisco router company has proposed a plan called Locator/Identifier Separation Protocol, or LISP which aims to solve this by re-aggregating the routing table without forcing people to change their precious IP addresses. A different view of this problem is IP address allocation, currently it is done by a central organization which assigns IP addresses in such a way as to make the routing table as small as possible. Unfortunately this creates a bar of entry to the ISP sphere because aspiring network operators must register with the central organization and apply for an allocation of IP addresses while demonstrating that they will not be wasted. It is always easier to show that you need IP addresses if you already have a network.

    Denial of service, an attempt to prevent legitimate users from accessing a service1, is likewise a new problem in the expanding network. To my knowledge, there is no general purpose solution to denial of service attacks. Solutions to packet flood based denial of service often revolve around hosting a service on many computers so that they can handle an enormous amount of traffic.

    Finally, the existing protocols are difficult to use, we cannot reasonably assign blame to anyone for this, many of these protocols are over thirty years old and demonstrate a level of craftsmanship which I can only hope to one day achieve. However, thirty years takes its toll on the best of us and as the Internet grew and became more complex, the administration interface of the typical router has grown a thicket of knobs, buttons and switches to match the proliferation of use cases and failure modes. As a result, network operation has become a science where students receive degrees and certificates for knowing the meanings of the plethora of knobs and switches, it has also become, like the tuning of the race car, an art, passed from master to apprentice and shared on mailing lists. Suffice to say, the bar of entry into the ISP realm is too high. Users, particularly in the ad-hoc wireless network arena, have observed the high bar of entry into traditional routing and have developed a menu of alternative, self-configuring protocols such as OLSR, HSLS, and BATMAN. [2]


    Cjdns support install on WiFi routers with OpenWrt.

    See also[edit]


    1. "Нашу сеть не одолеть" (in русский). rabkor.ru. 27.08.2014. Archived from the original on 2014-10-03. Retrieved 2 сентября 2014. Check date values in: |access-date=, |date= (help)
    2. https://github.com/cjdelisle/cjdns/blob/master/doc/Whitepaper.md

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