User's Manual

Chapter 7: Configuration
General configuration
Page 7-74
Bridge Entry
Timeout
Specify the appropriate bridge timeout for correct network operation
with the existing network infrastructure. The Bridge Entry Timeout must
be a longer period than the ARP (Address Resolution Protocol) cache
timeout of the router that feeds the network.
Caution
An inappropriately low Bridge Entry Timeout setting may
lead to temporary loss of communication with some end
users.
Translation Bridging
Optionally, you can configure the AP to change the source MAC address
in every packet it receives from its SMs to the MAC address of the SM
that bridged the packet, before forwarding the packet toward the public
network. If you do, then:
Not more than 10 IP devices at any time are valid to send data to the AP
from behind the SM.
SM populates the Translation Table tab of its Statistics web page,
displaying the MAC address and IP address of all the valid connected
devices.
Each entry in the Translation Table is associated with the number of
minutes that have elapsed since the last packet transfer between the
connected device and the SM.
If 10 are connected and another attempts to connect:
If no Translation Table entry is older than 255 minutes, the attempt is
ignored.
If an entry is older than 255 minutes, the oldest entry is removed and the
attempt is successful.
the Send Untranslated ARP parameter in the General tab of the
Configuration page can be:
Disabled, so that the AP overwrites the MAC address in Address
Resolution Protocol (ARP) packets before forwarding them.
Enabled, so that the AP forwards ARP packets regardless of whether it
has overwritten the MAC address.
When this feature is disabled, the setting of the Send Untranslated ARP
parameter has no effect, because all packets are forwarded untranslated
(with the source MAC address intact).
Send Untranslated
ARP
If the Translation Bridging parameter is set to Enabled, then the Send
Untranslated ARP parameter can be:
Disabled - so that the AP will overwrite the MAC address in Address
Resolution Protocol (ARP) packets before forwarding them.
Enabled - so that the AP will forward ARP packets regardless of whether
it has overwritten the MAC address.
If the Translation Bridging parameter is set to Disabled, then the Send
Untranslated ARP parameter has no effect.