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I have a wireless device on my router. I can see the device's mac in the router's DHCP table. My computer is also wireless to the router. When check the arp table via the computer, arp -a, the device is missing. I tried ping but the request timed out. If I hardwire the computer to the router, I can ping .255 and the arp table populates with the missing device?

What's going on? Is there is router setting that I need to change?

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The router most likely has a setting to isolate AP clients from each other. You need to disable this option. The exact option name depends on the router model and firmware. – David Schwartz Aug 15 '12 at 4:33
I have a Cisco wrt610N router. Do you know what setting value this would be? – sew Aug 15 '12 at 12:25
It depends on the firmware. If you're using factory firmware, it's under Advanced Wireless. You want to disable AP Isolation. – David Schwartz Aug 15 '12 at 12:26

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