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======== IP/ROHC tunnel ======== This page presents the IP/ROHC tunnel application. Instructions for [[iprohc-install|installing]] or [[iprohc-run|running]] the application are given on dedicated pages. ===== Origins ===== The tunnel application was designed and developed by [[|Viveris Technologies]]. Viveris Technologies is a French company working in the IT field. The company provides to the ROHC project the skills of its engineering teams in the telecommunications, network and Linux fields. [[|Viveris Technologies]] proposes the knowledge and expertise gained on the [[summary|ROHC library]] to companies and people that are interested in network header compression, but do not have the skills or the time to integrate the [[rohc-protocol|ROHC mechanisms]] in their application or infrastructure. The IP/ROHC application is published under the GPL version 2 (or later) license. ===== Features ===== The application compresses the IP packets that it receives on a TUN interface with the ROHC library. Then it encapsulates the ROHC packets in IP packets (to avoid the UDP overhead). In addition, frame packing is implemented: several ROHC packets are put together in one single IP header to reduce the tunnel overhead even more. IP encapsulation means less overhead, but it also means that NAT gateways won't handle it well in many cases. ===== Software architecture ===== The IP/ROHC application is divided into two parts: the server and the client. The server part handles sessions with several clients simultaneously. {{ :wiki:iprohc:iprohc_clients_server.png | one server handles several clients }} The client and the server establish two communication channels between them: the control channel that uses TCP for reliability, and the data channel that uses UDP for efficiency. The client establishes and closes a session on the control channel. The client transmits compressed data on the data channel. The control channel is authenticated and encrypted with TLS. {{ :wiki:iprohc:iprohc_channels.png | client and server use two channels }} Both the client and the server uses TUN interfaces to fake network interfaces. {{ :wiki:iprohc:iprohc_tun.png | client and server use a TUN interface}} ===== Supported platforms ===== The application was tested under Linux, and more especially Debian Squeeze, CentOS 5, Arch, and Gentoo. It should however work on every Linux distributions. If not, report a bug and/or send a patch. The application requires libyaml, gnutls, and ROHC. A RPM spec and a Debian package are available in the source tree.

iprohc-overview.1368094708.txt.gz · Last modified: 2013/05/09 10:18 by didier