Technical information

Watson SHDSL Router
Web-based Management Manual
Watson-SHDSL-Router-GUI-Manual.doc
Version 2.3-03
8-14
Revision: 2012-02-29
7. Click the 'Refresh' button to update the status if necessary. If the site is success-
fully located then 'Resolved' will appear in the status bar, otherwise 'Hostname
Resolution Failed' will appear. In case Watson fails to locate the website, do the
following:
 Use a Web browser to verify that the website is available. If it is, then you
probably entered the website address incorrectly.
 If the website is not available, return to the 'Website Restrictions' screen at a
later time and click the 'Resolve Now' button to verify that the website can be
found and blocked by Watson.
You may edit the website restriction by modifying its entry under the 'Local Host'
column in the 'Website Restrictions' screen.
To modify an entry:
1. Click the action icon for the restriction. The 'Restricted Website' screen ap-
pears. Modify the website address, group or schedule as necessary.
2. Click the 'OK' button to save your changes and return to the 'Website Re-
strictions' screen.
To ensure that all current IP addresses corresponding to the restricted websites are
blocked:
 Click the 'Resolve Now' button. Watson will check each of the restricted web-
site addresses and ensure that all IP addresses at which this website can be
found are included in the IP addresses column.
You can disable a restriction in order to make a website available again without
having to remove it from the 'Website Restrictions' screen. This may be useful if
you wish to make the website available only temporarily and expect that you will
want to block it again in the future.
 To temporarily disable a rule, clear the check box next to the service name.
 To reinstate it at a later time, simply reselect the check box.
 To remove a rule, click the action icon for the service. The service will be
permanently removed.
8.2.7 Network Address Translation (NAT)
Watson features a configurable Network Address Translation (NAT) and Network
Address Port Translation (NAPT) mechanism, allowing you to control the network
addresses and ports of packets routed through your gateway. When enabling mul-
tiple computers on your network to access the Internet using a fixed number of
public IP addresses, you can statically define which LAN IP address will be trans-
lated to which NAT IP address and/or ports.
By default, Watson operates in NAPT routing mode (refer to Section 8.4.8.3). How-
ever, you can control your network translation by defining static NAT/NAPT rules.
Such rules map LAN computers to NAT IP addresses. The NAT/NAPT mechanism
is useful for managing Internet usage in your LAN, or complying with various appli-
cation demands. For example, you can assign your primary LAN computer with a
single NAT IP address, in order to assure its permanent connection to the Internet.
Another example is when an application server with which you wish to connect,