Cisco Systems Configuring Client ARP Caching

5-28
Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-29225-01
Chapter5 Administering the Access Point
Configuring Client ARP Caching
Support for Secure Copy Protocol
The Secure Copy Protocol (SCP) supports file transfers between hosts on a network using Secure Shell
(SSH) for security. Cisco IOS Release 15.2(2)JB supports SCP file transfers to and from an access point
while you are logged into the access point itself.
AAA authentication is used to restrict the transfer of data. SCP enables AAA authorization to ascertain
your username and password to ensure the authenticity and confidentiality of the data in transit.
To configure SSH, use the following commands:
•ip hostname
•ip domain-name
•crypto key generate rsa (512, 1024,2048)
•ip SSH version
•aaa new-model
•aaa authentication login default local
•aaa authorization exec default local
•username cisco privilege 15 password 0 cisco
To perform SCP, use the copy run scp://url command.
Configuring Client ARP Caching
You can configure the wireless device to maintain an ARP cache for associated client devices.
Maintaining an ARP cache on the wireless device reduces the traffic load on your wireless LAN. ARP
caching is disabled by default.
This section contains this information:
•Understanding Client ARP Caching, page5-28
•Configuring ARP Caching, page5-29
Understanding Client ARP Caching
ARP caching on the wireless device reduces the traffic on your wireless LAN by stopping ARP requests
for client devices at the wireless device. Instead of forwarding ARP requests to client devices, the
wireless device responds to requests on behalf of associated client devices.
When ARP caching is disabled, the wireless device forwards all ARP requests through the radio port to
associated clients, and the client to which the ARP request is directed responds. When ARP caching is
enabled, the wireless device responds to ARP requests for associated clients and does not forward
requests to clients. When the wireless device receives an ARP request for an IP address not in the cache,
the wireless device drops the request and does not forward it. In its beacon, the wireless device includes
an information element to alert client devices that they can safely ignore broadcast messages to increase
battery life.