SYNACK

Establishes a Client-Server connection by calling connect which performs the 3-way Handshake of the TCP Protocol
Measures the time taken for the connection to be established b/w the client & server
Closes the connection once the RTT is measured by calling close which performs a 4-packet exchange
Repeats the above process at regular intervals (defined by the user) after the connection is closed
Performs statistical analysis on the RTT data obtained

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Code Compilation on various platforms

Linux: gcc -o synack synack.c -lpthread
SunOS: gcc -o synack synack.c -lpthread -lsocket -lnsl

Usage: synack [-options] host
Common options:
-p ##   port number to send to (default 22)
-k ##   no. of connections to be made
-i ##   Time interval between connections in secs (default 1 sec)
-u ## Time interval between connections in microsecs (minimum 20000 microsecs)
-z ##   Percentile 1 (default 25)
-Z ##   Percentile 2 (default 75)
-S ##   Timout in secs (default 1 Sec)
-s ##   Timeout in millisecs

Sample output of synack (from nereus.slac.stanford.edu to nocdev1-qos.es.net)

***** Round Trip Statistics of SYNACK to nocdev1-qos.es.net (Port = 22) ******
100 packets transmitted, 100 packets received, 0.00 percent packet loss
round-trip (ms) min/avg/max = 4.780/7.843/10.034 (std = 1.176)
(median = 7.830) (interquartile range = 1.685)
(25 percentile = 7.060) (75 percentile = 8.745)

Revised
URL: http://www-iepm.slac.stanford.edu/
Comments to iepm-l@slac.stanford.edu