Nat - AudioCodes MP-20x User Manual

If MP-20x fails to locate the website:
1. Use a Web browser to verify that the website is available. If it is, then you probably
entered the website address incorrectly.
2. If the website is unavailable, return to the screen 'Website Restrictions' later and click
the button Resolve Now to verify that the website can be found and blocked by MP-
20x.
3. You can edit the website restriction by modifying its entry under the column 'Local
Host' in the screen 'Website Restrictions'.
To modify an entry:
1. Click the icon Edit for the restriction; the screen 'Restricted Website' opens. Modify
the website address, group or schedule as required.
2. Click OK to save your changes and return to the screen 'Website Restrictions'.
To ensure that all current IP addresses corresponding to the restricted
websites are blocked:
1. Click the button Resolve Now; MP-20x checks each of the restricted website
addresses and ensures that all IP addresses at which this website can be found are
included in the IP addresses column.
You can disable a restriction to make a website available again without having to remove it
from the screen 'Website Restrictions'. This can be useful when making the website
temporarily available and when expecting to block it again in the future.
To temporarily disable a rule, clear the check box adjacent to the service name.
To reinstate it at a later time, recheck the check box.
To remove a rule, click the icon Remove for the service; the service is permanently
removed.
13.7

NAT

MP-20x 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 multiple 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 translated to which NAT IP address and/or
ports.
By default, MP-20x operates in NAPT routing mode. However, 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 application 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, such as a security server, requires that packets have a specific IP address
– you can define a NAT rule for that address.
MP-20x Telephone Adapter 192
User's Manual
Document #: LTRT-50609