Q. Can you enable routing or Network Address Translation (NAT) on
Cisco APs?
A. No, routing and NAT features are not supported on APs.
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.
Q. Can APs have multiple DHCP pools across different subnets?
A. When you configure the AP as a DHCP server, IP addresses are assigned to devices that
are on the same subnet as the DHCP server. The devices communicate with other devices on
the subnet, but do not communicate beyond the subnet. If you need to pass data beyond the
subnet, you must assign a default router. The IP address of the default router should be on the
same subnet as the AP that you configured as the DHCP server.
Q. What is the dBm measurement? How do I determine the equivalent
dBm values for the signal strength (in mW) listed on my Aironet access
point (AP)?
A. The unit dB measures the power of a signal as a function of its ratio to another
standardized value. This abbreviation dB is often combined with other abbreviations in order
to represent the values that are compared. Hence, dBm is the value which results from
comparing dB with a standardized reference value of 1 mW.
The formula to calculate this dBm value from the given signal strength in mW is:
Power (in dB) = 10 * log10 (Signal/Reference)
This list defines the terms in the formula. log10 is logarithm base 10.
Signal is the power of the signal (for example, 50 mW).♦
Reference is the reference power (for example, 1 mW).♦
Example:
If you want to calculate the power in dB of 50 mW signal strength, apply this formula:
Power (in dB) = 10 * log10 (50/1) = 10 * log10 (50) = 10 * 1.7 = 17 dBm
This formula results in a common rule that says:
For every increase of 3 dB (dBm here), it leads to a double increase in the current
transmit power (mW). For every decrease of 3 dB, this reduces the transmit power to
♦
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