Section: User's Manual (1)
tcpspray - TCP/IP bandwidth measurement tool (Discard and Echo client)
] [-b block_size
] [-d wait_81s
] [-n count
uses the Discard
protocol (RFC 863 resp. RFC 862)
to perform bandwidth measurements of TCP
sessions between the
local system, and a Discard
Unix-based hosts can provide a Discard and/or Echo servers with the Internet
inetd. 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
- -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_81s or --delay wait_81s
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
- -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
- -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.
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 does not require any privilege to run.
R33mi Denis-Courmont <remi at remlab dot net>