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From: Iain.Hanson_at_[hidden]
Date: 2001-07-27 13:18:38

     Local or remote
        I'm not sure but this may only be optional depending on whether the
     system supports it i.e. unix domain sockets. They are on Unixes and
     Mac's but not directly on Windows
     Protocol family
        etc ...
     With the exception of raw, this identifies the network layer ( OSI
     layer 3 ). raw gives access to the data link layer ( layer 2 ).
     Address Family
        NSAP family
     IPv4 and IPv6 only have a single addressing scheme. Other protocols
     such as OSI Network layer identified as NSAP ( Network Service Access
     Point ) have multiple ways of interpreting the address and can have
     different length addresses dependant on the scheme.
     Active or Passive
     This is whether the server calls listen or connect
     Blocking or Non-Blocking
     When we call write or read on a socket, the call blocks until all the
     data has been copied over into kernal space. If there is significantly
     more data than there is buffer space in the kernal ( typically 64K
     today ) then the write can block for a considerable period of time ).
     non-blocking calls return immeadiately if they would block and set
     errno to EAGAIN
     Unicast or Multicast or Broadcast
     Unicast is a transmission to a single other party i.e. point to point,
     Multicast transmitts to a channel and multicast routers ensure that it
     is only forwared to a subnet if clients have registered for the
     channel. Broadcast means send it everywhere.
     Connected or Connectionless
     whether you need to establish a connection to the far end including
     the allocation of resources ( some on route ) and at the far end
     beforte you can transmitt or receive data.
     TCP is a connection oriented transport layer that runs on top of
     connectionless IP. TP4 is a connectionless transport layer that can
     run over either CONS or CLNS ( Connection Oriented Network Service and
     Connection Less Network Service ).
     Datagram or Stream
     Whether the data ( from the user perspective ) arrives in packets or
     as a byte stream.
     Reliable or Un-reliable
     un-reliable means the protocol can lose packets without informing
     you. Reliable means that the protocl will request re-transmission of a
     lost packet without user/programmer intervention and if it can not get
     the packet after a number of retries it will inform the user.
     Ordered or UnOrdered
     Whether the data can only arrive at the user in sequence or if it can
     arrive out of sequence.
     support for out-of-band data
     This does not have to queue up in the buffers waiting to be sent, but
     may be sent urgently.
     I guess I probably need to write a glossary and put it in the vault.
     BTW Beman, could you post the requirements that you came up with
     please. Thanks.

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