Nat Details Screen - Verilink T1 Reference Manual

NAT Details Screen

The NAT Details screen (Figure 3.57) lets the user configure the NAT global
parameters described below.
Figure 3.57 NAT Details Screen
Enable Enables or disables NAT. Default is "Disable."
Mode Selects the Network Address Port Translation (NAPT) mode or the Basic
NAT mode. In NAPT mode, all hosts on the Global (public) side view all
hosts on the Local (private) side as a single internet host (one IP address). In
Basic NAT mode, the Global IP address is assigned as a Class C host address
(Mask of 255.255.255.0). Each private IP address on the Local side is mapped
to a Class C public address on the Global side. In other words, if there are 30
hosts on the private (Local) side, 30 public (Global) addresses are required.
The default is NAPT.
Global IP Addr Global IP Address used in NAPT mode. Must be a valid Class C address.
Default is LAN IP Address.
Global Mask IP Mask associated with defined Global IP Address. Default is LAN IP Mask.
ICMP Default Addr Default source address used to answer any ICMP request. Default is LAN IP
Address. ICMP requests are not transferred from the Global to the Local side.
Rather they are answered by the unit itself since Local addresses are private
and do not receive unsolicited requests.
Filter Non Local Discards any packet with "non corporate" source address. Default is "Enable."
Address
The screen parameters listed below are related to the NAT Control Block
Timer. Note that default values should be in accordance with most NAT
applications. The timers' values minimize NAT resources. Generally, when a
timer has expired, the resources used are no longer needed. Those resources
will then be available for other connection resources.
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