The Reliable Data Protocol (RDP) is a network transport protocol defined in RFC 908 and was updated in RFC 1151. It is meant to provide facilities for remote loading, debugging and bulk transfer of images and data.
The Reliable Data Protocol is an IP protocol, on the same layer as TCP and UDP. It is number 27 in the list of IP protocol numbers.
Similar to TCP, the Reliable Data Protocol is connection oriented, but, contrary to TCP, it does not require sequenced delivery of segments.
The Reliable Data Protocol has not gained popularity, though experimental implementations for BSD exist.[1]