Technical data

4. Packages
OPT_NTTCP Network checks
The program NTTCP can check network speed. On one side a server is started and on
the other side the client.
Start the server by executing nttcp -i -v. The server will wait for client requests. To test
i.e. speed execute nttcp -t IP Adress of the server on the client.
This is how a started nttcp server looks like:
fli4l-server 3.10.1~# nttcp -i -v
nttcp-l: nttcp, version 1.47
nttcp-l: running in inetd mode on port 5037 - ignoring options beside -v and -p
This is how a test with a nttcp client looks like:
fli4l-client 3.10.1~# nttcp -t 192.168.77.77
l~~8388608~~~~4.77~~~~0.06~~~~~14.0713~~~1118.4811~~~~2048~~~~429.42~~~34133.3
1~~8388608~~~~4.81~~~~0.28~~~~~13.9417~~~~239.6745~~~~6971~~~1448.21~~~24896.4
The nttcp help shows all further parameters:
Usage: nttcp [local options] host [remote options]
local/remote options are:
-t transmit data (default for local side)
-r receive data
-l# length of bufs written to network (default 4k)
-m use IP/multicasting for transmit (enforces -t -u)
-n# number of source bufs written to network (default 2048)
-u use UDP instead of TCP
-g#us gap in micro seconds between UDP packets (default 0s)
-d set SO_DEBUG in sockopt
-D don't buffer TCP writes (sets TCP_NODELAY socket option)
-w# set the send buffer space to #kilobytes, which is
dependent on the system - default is 16k
-T print title line (default no)
-f give own format of what and how to print
-c compares each received buffer with expected value
-s force stream pattern for UDP transmission
-S give another initialisation for pattern generator
-p# specify another service port
-i behave as if started via inetd
-R# calculate the getpid()/s rate from # getpid() calls
-v more verbose output
-V print version number and exit
-? print this help
-N remote number (internal use only)
default format is: %9b%8.2rt%8.2ct%12.4rbr%12.4cbr%8c%10.2rcr%10.1ccr
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