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+.. _vcl_ldpreload_doc:
+
+LD_PRELOAD the VCL
+==================
+
+vcl-ldpreload is a LD_PRELOAD library that uses the VPP Communications Library (VCL).
+
+User can LD_PRELOAD any application that uses POSIX socket API.
+
+NOTE: The sources have been moved to ``vpp/src/vcl`` and ``libvcl_ldpreload.so`` is built with VPP and can be found in
+``vpp/build-root/install-vpp[_debug]-native/vpp/lib``
+
+1. Running the demo
+-------------------
+
+Run test script without parameters to see help menu:
+
+::
+
+ export WS_ROOT= (e.g. /scratch/my_name/vpp)
+ $WS_ROOT/test/scripts/socket_test.sh
+
+
+2. Docker iPerf examples
+------------------------
+
+These launch xterms. To quit, close xterms and run following docker kill cmd (WARNING: This will kill all docker containers!) ‘docker kill $(docker ps -q)’
+
+Docker iPerf using default Linux Bridge
+
+::
+
+ $WS_ROOT/test/scripts/socket_test.sh -bi docker-kernel
+
+
+Docker iPerf using VPP
+
+::
+
+ $WS_ROOT/test/scripts/socket_test.sh -bi docker-preload