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Full Discussion: Packetize data to send it over tcp sockets
Special Forums IP Networking Packetize data to send it over tcp sockets Post 302908117 by DGPickett on Thursday 3rd of July 2014 04:52:31 PM
Old 07-03-2014
TCP is a reliable stream with no packet borders, so you need to write a protocol to run inside it that defines packet size at least, if you need to recover the packets. Otherwise, just treat it like a pipe/FIFO, but bidirectional. The main trick in TCP protocols is to make sure both ends are not just reading or just sending, as that is a lockup. If you have threads or poll/select() controlled I/O then that is less of a problem (you are both reading and writing both ends all the time).
Last edited by DGPickett; 07-30-2014 at 12:37 PM..
 

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LEARN ABOUT OSF1

pppstats

pppstats(8)						      System Manager's Manual						       pppstats(8)

NAME

       pppstats - Print Point-to-Point Protocol (PPP) statistics

SYNOPSIS

       /usr/sbin/pppstats [-a] [-v] [-r] [-c count] [-w secs] [interface] [-z]

OPTIONS

       Displays  absolute  values  rather  than  deltas.  With this option, all reports show statistics for the time since the link was initiated.
       Without this option, the second and subsequent reports show statistics for the time since the  last  report.   Repeats  the  display  count
       times.  The default repeat count is 1 if the -w option is not specified, otherwise infinity.  Displays the overall packet compression rate.
       The rate value is between 0 and 1, with 0 meaning that the data is incompressible.  Displays additional statistics, such as the	number	of
       packets ignored (rejected by the VJ TCP header decompression code).  Pauses wait seconds between each display.  If this option is not spec-
       ified, the default interval is 5 seconds.  Instead of the standard display, show statistics indicating the performance of the  packet  com-
       pression algorithm in use. See the STATISTICS section for further information on this option.

DESCRIPTION

       The  pppstats utility reports PPP-related statistics at regular intervals for the specified PPP interface.  If interface is unspecified, it
       will default to ppp0.  The display is split horizontally into input and output sections containing columns  of  statistics  describing  the
       properties and volume of packets received and transmitted by the interface.

   STATISTICS
       The  following  fields  are printed on the input side when the -z option is not used: The total number of bytes received by this interface.
       The total number of packets received by this interface.	The number of header-compressed TCP packets received by this interface.  The  num-
       ber  of header-uncompressed TCP packets received by this interface.  Not reported when the -r option is specified.  The number of corrupted
       or bogus header-compressed TCP packets received by this interface.  Not reported when the -r option is specified.  The number of VJ header-
       compressed  TCP packets dropped on reception by this interface because of preceding errors.  Only reported when the -v option is specified.
       The total number of non-TCP packets received by this interface.	Only reported when the -v option  is  specified.   The	compression  ratio
       achieved  for  received	packets  by the packet compression scheme in use, defined as the uncompressed size divided by the compressed size.
       Only reported when the -r option is specified.  The total number of bytes  received,  after  decompression  of  compressed  packets.   Only
       reported when the -r option is specified.

       The  following fields are printed on the output side: The total number of bytes transmitted from this interface.  The total number of pack-
       ets transmitted from this interface.  The number of TCP packets transmitted from this interface with VJ-compressed TCP headers.	The number
       of  TCP packets transmitted from this interface with VJ-uncompressed TCP headers.  Not reported when the -r option is specified.  The total
       number of non-TCP packets transmitted from this interface. Not reported when the -r option is specified.  The number of	searches  for  the
       cached  header  entry for a VJ header compressed TCP packet.  Only reported when the -v option is specified.  The number of failed searches
       for the cached header entry for a VJ header compressed TCP packet.  Only reported when the -v option is specified.  The	compression  ratio
       achieved  for transmitted packets by the packet compression scheme in use, defined as the size before compression divided by the compressed
       size. Only reported when the -r option is specified.  The total number of bytes to be transmitted, before packet  compression  is  applied.
       Only reported when the -r option is specified.

       When the -z option is specified, pppstats displays the following fields, relating to the packet compression algorithm currently in use.	If
       packet compression is not in use, these fields all display zeroes.  The fields displayed on the input side are: The number of bytes of com-
       pressed	packets received.  The number of compressed packets received.  The number of bytes of incompressible packets (that is, those which
       were transmitted in uncompressed form) received.  The number of incompressible packets received.  The recent compression ratio for incoming
       packets, defined as the uncompressed size divided by the compressed size (including both compressible and incompressible packets).

       The  fields  displayed  on  the	output	side are: The number of bytes of compressed packets transmitted.  The number of compressed packets
       transmitted.  The number of bytes of incompressible packets transmitted (that is, those which were transmitted in uncompressed form).   The
       number of incompressible packets transmitted.  The recent compression ratio for outgoing packets.

SEE ALSO

       Daemons: pppd(8)

																       pppstats(8)
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