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DTIM Period
RTS Threshold
Fragmentation
Threshold
2.2 Configure Portal Authentication
Portal authentication provides authentication service to the clients that only need
temporary access to the wireless network, such as the customers in a restaurant or in a
supermarket. To access the network, these clients need to enter the authentication login
page and use the correct login information to pass the authentication. In addition, you can
customize the authentication login page and specify a URL which the authenticated clients
will be redirected to.
In this module, you can also configure Free Authentication Policy, which allows the specific
clients to access the specific network resources without authentication.
The DTIM (Delivery Traffic Indication Message) is contained in some
Beacon frames. It indicates whether the EAP has buffered data for client
devices. The DTIM Period indicates how often the clients served by this
EAP should check for buffered data still on the EAP awaiting pickup.
You can specify the value between 1-255 Beacon Intervals. The default
value is 1, indicating that clients check for buffered data at every beacon.
An excessive DTIM interval may reduce the performance of multicast
applications, so we recommend you keep the default value.
RTS/CTS (Request to Send/Clear to Send) is used to improve the data
transmission efficiency of the network with hidden nodes, especially when
there are lots of large packets to be transmitted.
When the size of a data packet is larger than the RTS Threshold, the RTS/
CTS mechanism will be activated. With this mechanism activated, before
sending a data packet, the client will send an RTS packet to the EAP to
request data transmitting. And then the EAP will send CTS packet to inform
other clients to delay their data transmitting. In this way, packet collisions
can be avoided.
For a busy network with hidden nodes, a low threshold value will help
reduce interference and packet collisions. But for a not-so-busy network, a
too low threshold value will cause bandwidth wasting and reduce the data
throughput. The recommended and default value is 2347 bytes.
The fragmentation function can limit the size of packets transmitted over
the network. If the size of a packet exceeds the Fragmentation Threshold,
the fragmentation function is activated and the packet will be fragmented
into several packets.
Fragmentation helps improve network performance if properly configured.
However, a too low fragmentation threshold may result in poor wireless
performance caused by the extra work of dividing up and reassembling
of frames and increased message traffic. The recommended and default
value is 2346 bytes.
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