Network Address Translation (Nat) - Paradyne Hotwire 8300 User Manual

3. VT100 Interface

Network Address Translation (NAT)

NAT is a method of connecting multiple computers to the Internet (or any other IP
network) using one IP Address. This lets users cost-effectively and efficiently
connect their networks to the Internet.
Whether on a global or local port, NAT provides translation only upon receipt of a
packet, which NAT will translate, not translate, or filter, depending on the
user-specified parameters (further described below). If the decision is made to
translate, the packet will be modified internally, and eventually sent on to the IP
Gateway to be processed. If the decision is made not to translate, the packet will
not be modified in any way. If the decision is made to filter, the packet will be
discarded without any further action required.
NOTICE:
NAT Details Screen
The NAT Details screen
parameters described below.
Figure 3-54. 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.
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You must Save and Restart for any changes in NAT configuration
parameters to take effect.
(Figure 3-54) lets the user configure the NAT global
April 2003 8300-A2-GB20-00