Det lader faktisk til at der i nogle modeller findes såkaldte "time-based access control lists".
CITAT fra CISCO:
| Q. Is there a way to schedule a time when the
| Cisco IOS Software-based AP is available? I want
| to provide time-based access to clients that
| connect to the AP.
| A. You can configure time-based access control
| lists (ACLs) with use of time ranges. Time-based
| ACLs help you to make sure that users are able to
| access the wireless network within a particular
| time period, for example, 9:00 a.m. to 5:00 p.m.
| (0900 to 1700). The use of time-based ACLs does
| not shut down the AP or radio. Time-based ACLs
| stop the passing of traffic on the AP so that
| users cannot access the network. For information
| on how to configure this feature, refer to the
| Time-Based ACLs Using Time Ranges section of
| Configuring IP Access Lists.
Læs evt. mere her:
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a008058ed26.shtml#timeacl// Old-Faithful™