udaddy(1) on Linux
The text 948556b5d68d, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it.
RDMA CM datagram setup and simple ping-pong test.
Flags it lists
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-C -
-S -
-b -
-c -
-p -
-s -
-t