Paradyne JetFusion 2004, Руководство пользователя

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C o n f i g u r a t i o n 4-71
A significant advantage of NAT is that you can configure it without changing
hosts or routers, other than those few routers on which NAT is configured.
NAT multiplexes internal network traffic and presents it to the Internet as if it
is from a single source with one IP address.
Enable/Disable NAT Translation by Port
Each IAD is configured with NAT disabled. To enable NAT translation,
follow the steps below.
1
Type
“P”
on the NAT Configuration menu. If at least one virtual circuit on
the WAN exists and the LAN port is also configured with an IP address, or
more than one PVC exists, the IAD displays the interfaces (sample
following) on this IAD as shown in Figure 4.9. Otherwise, the IAD displays
the WAN port table and prompts you to select a port.
2
Type the port number on which to enable NAT and press Enter. The IAD
prompts you to enable or disable NAT.
3
Type
“E”
to enable NAT, or
“D”
to disable. The IAD saves the setting and
displays the NAT Configuration menu.
4
Continue with other NAT configuration tasks, or press Escape to return to
the Main menu.
Configure NAT TCP and UDP Timeouts
Under normal circumstances, the timeout default setting is adequate.
However, if users interact with products including multiple-player IP games
or video conferencing, you may need to configure the timeout.
The local server protocol you select determines which timeout to configure.
TDP and UDP are similar, except that TCP tracks TCP clients on a per-
connection basis and removes them from the table as soon as the connection
closes.
To configure a NAT timeout, follow the steps below.
1
On the NAT Configuration menu, type
“T”
to select TCP connections, or
type
“U”
to select UDP connections. The IAD displays a TCP or UPD
prompt.
2
Type the timeout value and press Enter. The IAD displays the NAT
Configuration menu.
3
Continue with other NAT configuration tasks, or press Escape to return to
the Main menu (Figure 2.2).
4
Reset the IAD.
Configure NAT Port Range
The size of the NAT port range defines the number of simultaneous
connections permitted. A small port range limits the number of connections.
Since the range that you assign must be outside the range of assigned ports,
do not set port ranges below 5,000.