How to monitor Network Performance - RAC Problem

Hi all,
I need help on something. I´m having some performance problems on my RAC enviroment and Oracle suporte says that i need to test my network.
What kind of tools can i use to do these tests on network cards, switchs, etc.
Tks,
Paulo.

I think the problem is on HBA!! The access through o storage. How to test it??
Regards,
Paulo

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what is your operating system?
refer the links, hope this may helps you.
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http://www.remote-dba.net/t_tuning_monitoring_network.htm
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How to monitor Network Performance - RAC Problem

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