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• Download Options. PDF (13.4 KB) View with Adobe Reader on a variety of devices. You can use the Test TCP utility (TTCP) to measure TCP throughput through an IP.

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http://www.ccci.com/product/network_mon/tnm31/ttcp.htm

http://ftp.arl.mil/~mike/ttcp.html

Presented by Jeanna Matthews, 11/13/01

This page written by Jared Hollenbeck

Overview / Background

Test TCP (TTCP) is a command-line sockets-based benchmarking tool for measuring TCP and UDP performance between two systems. It was originally developed for the BSD operating system starting in 1984. The original TTCP and sources are in the public domain, and copies are available from many anonymous FTP sites.

TTCP has become another standard UNIX networking tool because it has a real advantage over tools like FTP. If you have a high performance network, it is difficult for any single computer system to transfer data to or from disk at rates which are sufficient for real network testing. TTCP achieves high performance by filling a memory buffer with data, then repeatedly transmitting this data. Since everything is running from memory, you have a traffic transmitter and receiver that can operate at true network speeds.

TTCP has remained an excellent tool for bootstrapping hosts onto the network, by providing (essentially) a UNIX 'pipe' between two machines across the network.

Basics of Using TTCP

To use TTCP, you start a copy of TTCP in receive mode at one place within the network, then start a second copy in transmit mode at another place within the network. The results of the transfer of data from the transmitter to the receiver indicate the approximate performance of the path between the source and destination. By selecting the source and destination at various points with the network, you can analyze critical portions of the path.

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TCP is a connection oriented protocol, so we must have a receiver listening before a transmitter can connect. So the first step is to start up a TTCP receiver (or use the discard port on a destination system.)
For this demo, we are using the Windows version of ttcp called pcattcp:

Begin by starting a reciever on the destination machine:
pcattcp -r
Use ipconfig to note the IP address of the receiving machine:
ipconfig /all
Then the start the transmitter on the source machine:
pcattcp -t IP_Address_of_receiver
When the connection is made, the receiver outputs a status line showing that it has accepted the connection. Upon completion of the transfer, the receiver statistics are output, showing the amount of data transferred, the transfer time, the calculated throughput, and the number of I/O calls to read the data.

TTCP uses the time and the amount of data transferred, to calculate the throughput between the transmitter and the receiver.

Help Screen:

Typical Transmitting Screen:

UDP

By default, a TCP connection is used to transmit the data. You can use UDP instead byusing a '-u' flag on both the sender and the receiver:
On receiver: pcattcp -r -u
On transmitter: pcattcp -u -t dest_machine

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Performance Comparison

You can also vary the size of the packets sent over the network with the -l flag.We used this to compare TCP throughput to UDP throughput and how each of themis effected by changes in packet size.

For example, the following line will transmit 512 bytes at a time over a UDP connection:
On receiver: pcattcp -t -u -l 512 IP_address_of_receiver
In this demo, we collected the following data:

Transport Mechanism	Packet Size	Throughput (KB/s)
TCP	512	97
TCP	1460	119
UDP	512	4096
TCP	8192	165
UDP	8192	9216

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This data clearly shows that the overhead of TCP's reliable in-order byte stream with flow control. UDP has (*much* higher throughput! You can also see that larger packet size transltes into lower overhead and higher throughput!

Other Uses

To transfer files, data can be piped into the transmitter and out of thereceiver:
On receiver: pcattcp -r tar xvpf -
On transmitter: tar cf - directory pcattcp -t dest_machine

To work around routing problems, additional intermediate machines can be included by:
pcattcp -r pcattcp -t next_machine

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like TTCP, developed by NLANR. Friendlier and more functionality. See links below.

Here are some useful links: