PROLiNK Hurricane 9200/S, User Manual

Page: 120 / 205

Hurricane 9200/S ADSL Ethernet Router User’s Guide
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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, and the closing
state , in which the connection is being shut
down. When a NAT rule is in effect 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.
GRE Timeout (sec) Same as TCP Idle Timeout, but for GRE-
based communication sessions.
Default Nat Age (sec)
For all other NAT translation sessions, the
number of seconds after which a translation
session will no longer be valid if no packets
are received.
NAPT Port Start/End
When an NAPT rule is defined, the source
ports will be translated to sequential numbers
in this range.
If you change any values, click . Then click the Admin
tab and commit your changes to permanent system memory (see
page 45).
You can click to view accumulated data on
how many NAT rules have been invoked and how much data has
been translated. A page displays similar to the one shown in Figure
46.