User's Manual

Chapter 7: Configuration
Configuring IP and Ethernet interfaces
Page 7-37
Attribute
Meaning
NAT Enable/Disable
This parameter enables or disables the Network Address Translation
(NAT) feature for the SM. NAT isolates devices connected to the Ethernet
or wired side of a SM from being seen directly from the wireless side of
the SM. With NAT enabled, the SM has an IP address for transport traffic
separate from its address for management, terminates transport traffic,
and allows you to assign a range of IP addresses to devices that are
connected to the Ethernet or wired side of the SM.
When NAT is enabled, VLANs are not supported on the wired side of
that SM. You can enable NAT in SMs within a sector where VLAN is
enabled in the AP/BHM, but this may constrain network design.
IP Address
This field displays the IP address for the SM. DHCP Server will not
automatically assign this address when NAT is disabled.
Subnet Mask
This field displays the subnet mask for the SM. DHCP Server will not
automatically assign this address when NAT is disabled.
Gateway IP Address
This field displays the gateway IP address for the SM. DHCP Server will
not automatically assign this address when NAT is disabled.
ARP Cache Timeout
If a router upstream has an ARP cache of longer duration (as some use
30 minutes), enter a value of longer duration than the router ARP cache.
The default value of this field is 20 minutes.
TCP Session
Garbage Timeout
Where a large network exists behind the SM, you can set this parameter
to lower than the default value of 120 minutes. This action makes
additional resources available for greater traffic than the default value
accommodates.
UDP Session
Garbage Timeout
You may adjust this parameter in the range of 1 to 1440 minutes, based
on network performance. The default value of this parameter is 4
minutes.
Translation Table
Size
Total number of minutes that have elapsed since the last packet transfer
between the connected device and the SM/BHS.