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Page 36 / 74 Scroll up to view Page 31 - 35
ATU-R130 ADSL Ethernet Router User’s Guide
28
4.
If the interface named eth-0 is not already displaying, select it from the drop-
down list and click
.
The eth-0 interface specifies that your default Ethernet (LAN) interface
{
XE "LAN
interface"
}
is running DHCP relay for your LAN. Typically, this is the only interface you
need to specify here. If the ATU-R130 has additional interfaces that you want to
perform DHCP relay, you can select and add them.
(You can also delete an interface from the table by clicking
in the right column.)
5.
Click
.
A page displays to confirm your changes, and then the program returns to the DHCP
Relay Configuration page.
6.
Follow the instructions in “Setting the DHCP Mode”on page 28 to set the DHCP
mode to DHCP Relay.
Setting the DHCP Mode{ XE "DHCP:setting operating mode" }
You should set the DHCP mode only after you have configured DHCP relay or DHCP
server settings. See “Configuring DHCP Server”on page 23 or “Configuring DHCP Relay”
on page 27 for additional instructions.
Follow these instructions to set the DHCP mode:
1.
Click the LAN tab, and then click
DHCP Mode
in the task bar.
2.
From the DHCP Mode drop-down list, choose
DHCP Server
,
DHCP Relay
, or
none
.
If you choose none, your LAN computers must be configured with static IP
addresses.
3.
Click
.
4.
Click the Admin tab, and then click
Commit & Reboot
in the task bar.
5.
Click
to save your changes to permanent memory.
Page 37 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
29
7
Configuring Network Address Translation
This chapter provides Network Address Translation (NAT) instructions for modifying the
default configuration on your device.
Your Default NAT Setup
By default, NAT is enabled, with a napt rule configured to perform the following translation:
{
XE
"NAT:default configuration"
}
These private IP addresses:
...are translated to:
192.168.1.2
192.168.1.3
.
.
.
192.168.1.13
Your ISP-assigned
public IP address
For a description of napt rules, see page 33. This default NAT setup assumes that, on each
LAN computer, you configured TCP/IP properties as follows:
?
You selected the check box that enables them to receive their IP addresses
automatically (that is, to use a DHCP server);
or,
?
You assigned static IP addresses to your PCs in the range 192.168.1.2 through
192.168.1.13.
If your computers are not configured in one of these ways
, you can either change the IP
addresses on your computers to match the NAT setup or delete this NAT rule and add a new
one that matches the addresses you assigned to your computers (see “Adding NAT Rules”
on
page 33 for instructions).
Viewing NAT Global Settings
and Statistics
{
XE "NAT:global settings"
}
To view your NAT settings, log into Configuration Manager, click the
Services tab. The NAT Configuration page displays by default, as shown in Figure .
Figure 19. NAT Configuration Page{ XE "NAT Configuration page" }{
XE "Pages:NAT Configuration" }
Page 38 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
30
The NAT Configuration page contains the following elements:
?
The NAT Options drop-down list, which provides access to the Global Information page
(shown by default), the NAT Rule Configuration page, and the NAT Translations page,
which shows current translations.
?
Enable/Disable radio buttons, which allow you to turn on or off the NAT feature.
?
The NAT Global Information table, which displays the following settings that apply to all
NAT rule translations:
Field
Description
TCP Idle Timeout (sec)
For a NAT translation session on data that
uses the TCP protocol, the translation will
no longer be performed if no matching data
packets are received after the specified
time has elapsed.
TCP Close Wait (sec)
For a NAT translation on data using the
TCP protocol, after a communication
session has been closed, the translation
will no longer be performed if no matching
data packets are received after the
specified time has elapsed.
TCP Def Timeout (sec)
For a NAT translation session on data that
uses the TCP protocol, the translation will
no longer be performed if no matching data
packets are received after the specified
time has elapsed.
UDP Timeout (sec)
Same as TCP Idle Timeout, but for UDP
packets.
ICMP Timeout (sec)
Same as TCP Idle Timeout, but for ICMP
packets.
GRE Timeout (sec)
Same as TCP Idle Timeout, but for GRE
packets.
Default Nat Age (sec)
For all other NAT translation sessions, the
number of seconds after which a
translation session will no longer be valid.
NAPT Port Start/End
When a napt rule is defined, the source
ports will be translated to sequential
numbers in this range.
If you change any values, click
, and then click the Admin tab and commit your
changes to permanent system memory (see page 17).
You can click
to view accumulated data on how many NAT rules have
been invoked and how much data has been translated. A page similar to the one is shown in
Figure displays.
Page 39 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
31
Figure 20. NAT Rule Global Statistics Page{ XE "NAT Rule Global Statistics page" }{ XE
"Pages:NAT Rule Global Statistics" }
The table provides basic information for each NAT rule you have set up. You can click
to restart the accumulation of the statistics at their initial values.
Viewing NAT Rules and Rule Statistics
To view the NAT rules currently defined on your system, select
NAT Rule Entry
in the NAT
Options drop-down list. The NAT Rule Configuration page displays, as shown in Figure .
Figure 21. NAT Rule Configuration Page{ XE "NAT Rule Configuration page" }{ XE "Pages:NAT
Rule Configuration" }
The NAT Rule Configuration table displays a row containing basic information for each rule. For
a description of these fields, refer to the instructions for adding rules (pages 33 through 39).
From the NAT Rule Configuration page, you can click
to add a new rule, or use the icons
in the right column to delete (
) or view details on (
) a rule.
{
XE "NAT:viewing performance statistics"
}
To view data on how often a specific NAT rule has
been used, click
in the Action(s) column. A page similar to the one show in Figure
displays:
Page 40 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
32
Figure 22. NAT Rule Statistics Page
{
XE "NAT Rule Statistics page"
}{
XE "Pages:NAT Rule
Statistics"
}
The statistics show how many times this rule has been invoked and how many currently active
sessions are using this rule. You can click
to reset the statistics to zeros and
to display newly accumulated data.
Viewing Current NAT Translations
To view a list of NAT translations that have recently been performed and which remain in effect
(for any of the defined rules), select
NAT Translations
from the NAT Options drop-down list.
The NAT Translations page displays, as shown in Figure :
Figure 23. NAT Translations Page{ XE "NAT Translations page" }{ XE "Pages:NAT Translations" }
For each current NAT translation session, the table contains the following fields:
Field
Description
Trans Index
The sequential number assigned to the IP
session used by this NAT translation session.
Rule ID
The ID of the NAT rule invoked.
Interface
The device interface on which the NAT rule was
invoked (from the rule definition).
Protocol
The IP protocol used by the data packets that
are undergoing translations (from the rule
definition) Example: TCP, UDP, ICMP.
Alg Type
The
Application Level Gateway
(ALG), if any,
that was used to enable this NAT translation
(ALGs are special settings that certain
applications require in order to work while NAT is
enabled).
NAT Direction
The direction (incoming or outgoing) of the
translation (from the port definition).
Entry Age
The elapsed time, in seconds, of the NAT
translation session.

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