Interplanetary overlay network (ion) software distribution is an implementation of delay-tolerant networking (dtn) architecture as described in internet rfc 4838.

this is a suite of communication protocol implementations designed to support mission operation communications across an end-to-end interplanetary network, which might include on-board (flight) subnets, in-situ planetary or lunar networks, proximity links, deep space links, and terrestrial internets.

included in the ion software distribution are the following packages:
* ici (interplanetary communication infrastructure) a set of libraries
that provide flight-software-compatible support for functions on
which the other packages rely
* bp (bundle protocol), an implementation of the delay-tolerant
networking (dtn) architecture's bundle protocol.
* dgr (datagram retransmission), a udp reliability system that implements
congestion control and is designed for relatively high performance.
* ltp (licklider transmission protocol), a dtn convergence layer for reliable
transmission over links characterized by long or highly variable delay.
* ams - an implementation of the ccsds asynchronous message service.
* cfdp - a class-1 (unacknowledged) implementation of the ccsds file
delivery protocol.
this package contains the documentation and some configuration example.