iperf is a tool for performing network throughput measurements under Linux or Unix operating systems. It can test either TCP or UDP throughput. To perform an iperf test the user must establish both a server (to discard traffic) and a client (to generate traffic).
Read answer to: "Linux / Unix: Test Internet Connection Speed From Console Over SSH Command Line"
What is the difference between UDP and TCP internet protocols?
Linux Network IP Accounting
Linux: Find Out Which Process Is Listening Upon a PortDebian / Ubuntu Linux Install ntop To See Network Usage / Network Status
Debian / Ubuntu: Set Port Knocking With Knockd and Iptables
Linux: Tune NFS Performance 
HowTo: UNIX / Linux Open TCP / UDP PortsLinux: Block Port With IPtablesFreeBSD Jail Access Private Network Via NAT and PF
Access NAS server using NFS protocol under Linux or UNIX
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