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I have installed dd-wrt in tp-link tl-wr740n router, so with dynamic DHCP WAN setting, and Wireless settings are as below,

Basic Settings 
    wireless mode : AP
    wireless network mode : mixed or 802.n only (which is better)
    channel width : full
    wireless channel : auto 

Wireless security 
    Security mode : WPA2 Personal
    Encryption : AES

now, the with wire connectivity, i can access internet and everything working fine.

when i'm setting security mode none (no security) everything is working but in laptop wi-fi, it displaying "limited connectivity". even the laptop can't get ip from the router.

whrere is the problem ??

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Well, do you by any chance have entered wrong password? –  DKasipovic Feb 28 '14 at 10:17
no i'm entering right password if it was wrong then laptop can't even connect... but in this case laptop is connecting but getting "limited Access" –  Bhavesh Gangani Feb 28 '14 at 10:19

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