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Host Identity Protocol
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<h2 id="version-2">Version 2</h2> <p>Host Identity Protocol version 2 (HIPv2), also known as HIP version 2, is an update to the protocol that enhances security and support for mobile environments. HIP continues to separate the roles of identification and location in IP addressing by implementing a host identity namespace based on cryptography. This version introduces new features that allow devices to connect more securely and efficiently, even in scenarios involving mobility and multihoming (connecting to multiple networks). </p> <h2 id="enhanced-security">Enhanced security</h2> <p>HIPv2 strengthens device authentication security and provides protection against spoofing and denial-of-service (DoS) attacks. Host Identifiers (HIs) are generated with cryptographic keys, giving each device a unique identity. The protocol also uses the Encapsulating Security Payload (ESP) format for encrypting data, which ensures the integrity and confidentiality of communications. </p> <h2 id="mobility-and-multihoming">Mobility and multihoming</h2> <p>HIPv2's design enables devices to change networks without losing the session, a crucial advantage for mobile and IoT applications. This capability to switch networks seamlessly makes HIPv2 well-suited for devices that require constant and reliable connectivity, such as mobile phones and IoT sensors. Additionally, HIPv2 facilitates multihoming, allowing simultaneous connections to multiple networks, which improves connection resilience and availability. </p> <h2 id="rfc-references">RFC references</h2> <ul><li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc4423">4423</a> - Host Identity Protocol (HIP) Architecture (early "informational" snapshot, obsoleted by RFC 9063)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5201">5201</a> - Host Identity Protocol base (Obsoleted by RFC 7401)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5202">5202</a> - Using the Encapsulating Security Payload (ESP) Transport Format with the Host Identity Protocol (HIP) (Obsoleted by RFC 7402)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5203">5203</a> - Host Identity Protocol (HIP) Registration Extension (obsoleted by RFC 8003)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5204">5204</a> - Host Identity Protocol (HIP) Rendezvous Extension (obsoleted by RFC 8004)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5205">5205</a> - Host Identity Protocol (HIP) Domain Name System (DNS) Extension (obsoleted by RFC 8005)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5206">5206</a> - End-Host Mobility and Multihoming with the Host Identity Protocol</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc5207">5207</a> - NAT and Firewall Traversal Issues of Host Identity Protocol (HIP) Communication</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc6092">6092</a> - Basic Requirements for IPv6 Customer Edge Routers</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc7401">7401</a> - Host identity protocol version 2 (HIPv2) (updated by RFC 8002)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc7402">7402</a> - Using the Encapsulating Security Payload (ESP) transport format with the Host Identity Protocol (HIP)</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc8002">8002</a> - Host Identity Protocol Certificates</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc8003">8003</a> - Host Identity Protocol (HIP) Registration Extension</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc8004">8004</a> - Host Identity Protocol (HIP) Rendezvous Extension</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc8005">8005</a> - Host Identity Protocol (HIP) Domain Name System (DNS) Extension</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc8046">8046</a> - Host Mobility with the Host Identity Protocol</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc8047">8047</a> - Host Multihoming with the Host Identity Protocol</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc9028">9028</a> - Native NAT Traversal Mode for the Host Identity Protocol</li> <li><a href="/facts/RFC_(identifier)/esftTvE7">RFC</a> <a href="https://www.rfc-editor.org/rfc/rfc9063">9063</a> - Host Identity Protocol Architecture</li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Identifier-Locator_Network_Protocol/2HjcTwUV">Identifier-Locator Network Protocol</a> (ILNP)</li> <li><a href="/facts/IPsec/01MwcET1">IPsec</a></li> <li><a href="/facts/Locator%2fIdentifier_Separation_Protocol/jC48JXHN">Locator/Identifier Separation Protocol</a> (LISP)</li> <li><a href="/facts/Mobile_IP/55FC9Exv">Mobile IP</a> (MIP)</li> <li><a href="/facts/Proxy_Mobile_IPv6/mj9K5Ewh">Proxy Mobile IPv6</a> (PMIPv6)</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://datatracker.ietf.org/wg/hip/about/">IETF HIP working group </a></li> <li><a href="https://www.irtf.org/concluded/hiprg.html">IRTF HIP research group</a></li> <li><a href="https://openhip.sourceforge.net/">OpenHIP project</a></li> <li><a href="http://mkomu.kapsi.fi/hipl/index.php?index=how">How HIP works - InfraHIP project archive</a></li> <li><a href="http://www.ict-optimix.eu/index.php/HIPSim">HIP simulation framework for OMNeT++</a>. <a href="https://web.archive.org/web/20190628063431/www.ict-optimix.eu/index.php/HIPSim">Archived</a> 2019-06-28 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>RFC 4423, Host Identity Protocol (HIP) Architecture, Section 4.1 <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>