help with DHCP IP renew

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Mar 18, 2009
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MacBook 2.4ghz dual-core 4gb ram
Hi all,

I'm encountering a network problem when I try to get AirPort connection in my university's library.
I have followed uni's guideline on how to set up a connection, such as all the proxies PAC and certificate trust settings in keychain access. After seeking help from a few techy librarians, we have come to the conclusion that there's something wrong with the IP and needs assigning a new IP.
I have tried to click the renew DHCP lease under TCP/IP tab, but it doesn't change anything. Am I missing something? How do you usually renew the IPv4 address?

Thanks for the help in advance.
 

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