tcpspray.ndisc6(1) - man - phpman

TCPSPRAY(1)                                 User's Manual                                TCPSPRAY(1)



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

SYNOPSIS
       tcpspray [-46ev] [-b block_size] [-d wait_µµs] [ -f filename] [-n count] <hostname> [port]


DESCRIPTON
       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-server in‐‐
       etd. On Windows NT, the simple network protocols 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.


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


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


       -b block_size or --bsize block_size
              Send block of the specified byte size (default: 1024).


       -d wait_µµs or --delay wait_µµs
              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.


       -f filename or --fill filename
              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.


       -n block_count or --count block_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.


DIAGNOSTICS
       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  tcp‐
       traceroute6(8)  resp.  tcptraceroute(8) toward the IPv6 resp. IPv4 remote host might help de‐
       tecting such a situation.


SECURITY
       tcpspray does not require any privilege to run.


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


AUTHOR
       Rémi Denis-Courmont <remi at remlab dot net>

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



tcpspray                                       $Date$                                    TCPSPRAY(1)