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SCTP is a reliable transport protocol operating on top of a
   connectionless packet network such as IP.  It offers the following
   services to its users:

   --  acknowledged error-free non-duplicated transfer of user data,

   --  data fragmentation to conform to discovered path MTU size,

   --  sequenced delivery of user messages within multiple streams, with
       an option for order-of-arrival delivery of individual user
       messages,

   --  optional bundling of multiple user messages into a single SCTP
       packet, and

   --  network-level fault tolerance through supporting of multi-homing
       at either or both ends of an association.

   The design of SCTP includes appropriate congestion avoidance behavior
   and resistance to flooding and masquerade attacks.