tcpspray - TCP/IP bandwidth measurement tool (Discard and Echo client)

       Rémi Denis-Courmont <remi at remlab dot net>

       http://www.remlab.net/ndisc6/

tcpspray                                             $Date$                                          TCPSPRAY(1)

tcpspray  uses  the Discard resp. Echo protocol (RFC 863 resp. RFC 862) to perform bandwidth measurements
       of TCP sessions between the local system, and a Discard resp. Echo server.

       Unix-based hosts can provide a Discard and/or Echo servers  with  the  Internet  super-serverinetd.  On
       Windows NT, the simplenetworkprotocols optional component will do the same.

       The  name  or  address  of the server node must be specified. tcpspray will automatically try to use IPv6
       when available. If not, or if it fails, it will fallback to IPv4. However, tcpspray4 resp. tcpspray6 only
       try to use IPv4 resp. IPv6.

       If  you  get  no  response  while  you  know  the  remote  host  is  up, it is most likely that it has no
       Discard/Echo service running, or that these services are blocked by a firewall. Running tcptraceroute6(8)
       resp.  tcptraceroute(8) toward the IPv6 resp. IPv4 remote host might help detecting such a situation.

       tcpspray - TCP/IP bandwidth measurement tool (Discard and Echo client)

-4 or --ipv4
              Force usage of TCP over IPv4.

       -6 or --ipv6
              Force usage of TCP over IPv6.

       -bblock_size or --bsizeblock_size
              Send block of the specified byte size (default: 1024).

       -dwait_µs or --delaywait_µs
              Waits for the given amount of microseconds after any given was sent before attempting to send  the
              next one. There is no delay by default.

       -e or --echo
              Use the Echo protocol instead of Discard. tcpspray will measure the time required to send data and
              receive it back, instead of simply sending it.

       -ffilename or --fillfilename
              Read  data  from the specified file to fill sent blocks with. If the file is smaller than the size
              of blocks, or if no file were specified, the remaining trailing bytes are all set to zero.

       -h or --help
              Display some help and exit.

       -nblock_count or --countblock_count
              Send the specified amount of data blocks for the measurements (default: 100).

       -V or --version
              Display program version and license and exit.

       -v or --verbose
              Display more verbose informations. In particular, tcpspray will print a dot each time a  block  is
              sent. If the Echo protocol is used (option -e), dots will be erased as data is received back.

       tcpspray does not require any privilege to run.

tcp(7), inetd(8), tcptraceroute6(8), tcptraceroute(8)

tcpspray [-46ev] [-bblock_size] [-dwait_µs] [ -ffilename] [-ncount] <hostname> [port]