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Cisco Wireless and Mac's

We have a Cisco Wireless Controller, model 4402 with both b/g and a/n.  The AP's have the latest IOS.  We have two SSID's available- one for the private network and one for a public network that provides only internet access.  The DHCP server for both wireless networks runs off of the controller.  We have a class B network for the private network and a super-netted class C, 500 ipaddresses for the public side.  The problem is that over a few weeks Macbooks lose the ability to access the  internet over the public network. They get a correct IP address, gateway and DNS server however, they are not able to ping anything on the network but can ping themselves.  A Macbook could work today but then not tomorrow.  We sort of resolve the issue by rebooting all of the AP's but would like to resolve the underlying issue.  Any ideas?
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cssunetadmin
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cssunetadmin
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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
The issue typically are the APs. No matter what brand you have a reboot is necessary. At home with my dd-wrt unit i reboot once a week. At work, I reboot when users start to complain.
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