Network Address Translation (NAT, also known as network masquerading or IP masquerading) rewrites the source and/or destination addresses/ports of IP packets as they pass through a router or firewall. It is most commonly used to connect multiple computers to the Internet (or any other IP network) by using one IP address. This allows home users and small businesses to cheaply and efficiently connect their network to the Internet.
The basic purpose of NAT is to multiplex traffic from the internal network and present it to the Internet as if it was coming from a single computer having only one IP address. The Mediatrix unit’s NAT service allows the dynamic creation and configuration of network address translation rules. Depending on some criteria, the packet matching the rule may see its source or destination address modified.
There are two types of NAT rules:
The maximum number of rules allowed in the configuration is 10 of each Source NAT and
Destination NAT. Note Adding source or destination NAT rules has an impact on the Mediatrix unit’s overall performance as the NAT requires additional processing. The more rules are enabled, the more overall performance is affected. Furthermore, Media5 recommends to use a 30 ms packetization time when the NAT is enabled (instead of a 20 ms ptime, for instance) in order to simultaneously use all the channels available on the unit. Note The Mediatrix unit NAT service does not support IPv6
A NAT rule specifies a set of matching conditions for network packets.
Each rule can use one or more of the following criteria:
The NAT rules are applied on a first match basis, in the order they appear in the configuration.
Because the first match is applied, you must ensure that specific rules come before more general rules, or the specific rules might not be applied as desired.
IP Addresses can take the form of:
It is also possible to use the name of a network interface to represent either the current IP address or network of that interface.
For example, if your lan interface is configured as 192.168.0.10/24
If the specified interface is disabled or removed, the rule is automatically disabled thus removed from the NAT. When the network interface is enabled or added back, the rule is automatically enabled and applied in the NAT.
When using the Network Firewall service, it is important to configure it with respect to the Destination NAT rules because:
An example of this would be port forwarding where the DNAT changes the routed address of a packet to a new IP address/port. The Network Firewall must also accept connection to this IP/port in order for the port forwarding to work.
if you wish to start the service, or 
to restart the service.
to stop the service.Note
When stopping or restarting a service, some interruptions might occur, such as dropped calls, virtual machine shutdown or loss of network connectivity, depending on the affected services and/or its dependencies.
, the tab from which you can access the
service from the Web pages are greyed out
, the tab from which you can access the service from
the Web pages are no longer greyed out.
Note
To add a rule before an existing entry, locate the proper row in the table and click the
button of this row. To add a rule at the end of the existing rows, click the
button at the bottom right of the section.
Note
The yellow Yes in the Config Modified section at the top of the window indicates that the configuration has been modified but not applied (i.e., the Network Address Translation section of the Status page differs from the NAT page).
Note
To add a rule before an existing entry, locate the proper row in the table and click the
button of this row. To add a rule at the end of the existing rows, click the
button at the bottom right of the section.
Note
The yellow Yes in the Config Modified section at the top of the window indicates that the configuration has been modified but not applied (i.e., the Network Address Translation section of the Status page differs from the NAT page).
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If you are not familiar with the meaning of the fields and buttons, click Show Help , located at the upper right corner of the Web page. When activated, the fields and buttons that offer online help will change to green and if you hover over them, the description will be displayed.
Mediatrix units are supplied with an exhaustive set of documentation.
Mediatrix user documentation is available on the Documentation Portal at http://documentation.media5corp.com
Several types of documents were created to clearly present the information you are looking for. Our documentation includes:
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