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Configuring Network Address Translation
64
The [NAT Configuration] page contains the following elements:
•
The [NAT Options] drop-down list will provide access to the
[NAT Configuration] page and [NAT Global Information] table
(shown by default and in Figure 16), the [Network Address
Translation (NAT) Rule
Configuration] page (see Figure 18)
and the [NAT Translations]
page (see Figure 20).
•
The [Enable] and [Disable] radio buttons will allow you to turn
on or off the NAT feature.
•
The [NAT Global Information] table will display the following
settings that apply to all NAT rule translations:
Field Description
TCP Idle
Timeout (sec):
TCP Close Wait
(sec):
TCP Def
Timeout (sec):
When two computers communicate via the Internet, a
TCP-based communication session is created between
them to control the exchange of data packets. The TCP
session can be viewed as being in one of three states,
depending on the types of packets being transferred.
- The establishing state, where the connection is being set
up.
- The active state, where the connection is being used to
transfer data.
- The closing state, in which the connection is being shut
down.
When a NAT rule is effective on a TCP session in the active
state, the session will timeout if no packets are received for
the time specified in [TCP Idle Timeout].
When in the closing state, the session will timeout if no
packets are received for the time specified in [TCP Close
Wait].
When in the establishing state, the session will timeout if no
packets are received for the time specified in [TCP Def
Timeout].
UDP Timeout
(sec):
Same as TCP Idle Timeout, but for UDP-based
communication sessions.
ICMP Timeout
(sec):
Same as TCP Idle Timeout, but for ICMP-based
communication sessions.