IPv4 Option for Sender Directed Multi-Destination Delivery (RFC1770)
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2019-Feb-12
Internet Society Requests For Comment (RFCs)
This memo defines an IPv4 option to provide a sender directed multi- destination delivery mechanism called Selective Directed Broadcast Mode (SDBM). This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
Network Working Group C. Graff Request for Comments: 1770 US Army CECOM Category: Informational March 1995
IPv4 Option for Sender Directed Multi-Destination Delivery
Status of this Memo
This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
This memo defines an IPv4 option to provide a sender directed multi- destination delivery mechanism called Selective Directed Broadcast Mode (SDBM). The SDBM provides unreliable UDP delivery to a set of IP addresses included in the option field of an IPv4 datagram. Data reliability if required will be provided by the application layer. This approach was developed to support sender directed multi- destination delivery to sparsely populated groups with no additional control traffic. This approach will find application in the extremely bandwidth constrained tactical military environment, as well as in some commercial applications requiring sender control of data delivery.
The Selective Directed Broadcast Mode (SDBM) is an integral part of the U.S. Army standard for tactical data communication networks as defined in MIL-STD-188-220() (Reference 1). The MIL-STD-188-220() defines a protocol architecture for the lower four layers of the ISO-OSI Reference model. The MIL-STD-188-220() is currently undergoing a reformatting to be consistent with other DoD standards that deal with IP networking. These efforts will provide tactical IP internetting of tactical Army broadcast radio networks, and will support fully IP compliant internetworking to other types of IP networks via commercial IP routers. It is the goal of the U.S. Army to move toward a fully IP compliant internetwork architecture for all tactical battlefield data communications. The Army does, however, have a critical need for a reliable, sender directed multi- destination data transfer capability that is not currently supported by the existing or emerging internet standards. The SDBM IP option was developed to meet this need. The required data reliability will be provided by incorporating an acknowledgement strategy at the application layer. It is hoped that this IP option, providing multi- destination capability not currently provided by the current and
Graff [Page 1]
RFC 1770 Selective Directed Broadcast Protocol March 1995
emerging internet standards, will be embraced by the internet community and become an integal part of the IP family of protocols and be incorporated in commercial IP software products.
The SDBM provides the ability for an application to explicitly list a set of intended IP destinations. This capability will be implemented as an option in the IP layer, as shown in Figure 1. This option field is variable in length, up to a maximum of 40 octets due to the limitation of the HLEN field as specified in STD 5, RFC 791 (Reference 2). Under this option 38 of the 40 octets would be used to contain the 2 octet co...