Download help

[jim hawks <r80007 --at-- freescale.com>]

I downloaded "Linux libc 2.3 binary 
<http://dast.nlanr.net/projects/iperf/iperf-1.7.0-linux-2.3.tar.gz> 68 
KB .tar.gz" ( iperf-1.7.0-linux-2.3.tar.gz, 69791 bytes).

I attempted to performed the steps from the document:

gunzip -c iperf-<version>.tar.gz | tar -xvf -
cd iperf-<version>
make

But, after I uncompressed/untar'ed it, I couldn't "cd" since there was 
no directory iperf-1.7.0-linux-2.3.

What I'm getting is:
drwx------    2 504      504          4096 Aug 13 13:20 doc
-rwxrwxr-x    1 504      504         87682 Mar 12  2003 iperf
-rwxr-xr-x    1 504      504          4000 Mar 12  2003 KNOWN_PROBLEMS
-rwxr-xr-x    1 504      504           614 Jan 13  2003 README

where iperf is an ELF file. I downloaded "Linux libc 2.1 binary 
<http://dast.nlanr.net/projects/iperf/iperf-1.7.0-linux-2.1.tar.gz> 147 
KB .tar.gz" and got the same results.

Could you tell me what I'm missing?