Guest Accounts do not have Internet Access unless

Guest Accounts do not have Internet Access unless "allow guest to access my local network" is checked.

When I uncheck the "allow guest to access my local network" the Internet Conncetion fails with "the DNS Server is not responding".

WNDR3800 V1.0.0.34 I have 6 of these.

Same thing on 4 different networks. 3 residential and 1 business Network.

The Radio connects fine in all tests. 2.4/5 GHz IEEE 802.11 a b g n

When I check the "allow guest to access my local network" everything is fine.

Any/all hep is appreciated... What am I doing wrong?