Configuring Nat Translation Per Ip Interface - AudioCodes Mediant 3000 User Manual

14.5

Configuring NAT Translation per IP Interface

The NAT Translation table defines NAT rules for translating source IP addresses per VoIP
interface (SIP control and RTP media traffic) into NAT IP addresses (global). This allows,
for example, the separation of VoIP traffic between different ISTP's, and topology hiding of
internal IP addresses to the "public" network. Each IP interface (configured in the Multiple
Interface table - InterfaceTable parameter) can be associated with a NAT rule in this table,
translating the source IP address and port of the outgoing packet into the NAT address (IP
address and port range).
The device's priority method for performing NAT is as follows (not relevant for the SBC
application):
a. Uses an external STUN server (STUNServerPrimaryIP parameter) to assign a NAT
address to all interfaces.
b. Uses the StaticNATIP parameter to define one NAT IP address for all interfaces.
c. Uses the NATTranslation parameter to define NAT per interface.
If NAT is not configured (by any of the above-mentioned methods), the device sends the
packet according to its IP address defined in the Multiple Interface table.

To configure NAT translation rules:
1. Open the NAT Translation Table page (Configuration tab > VoIP menu > Control
Network submenu > NAT Translation Table ).
2. Configure the parameters according to the table below.
3. Click Submit to apply your changes.
4. To save the changes to flash memory, see 'Saving Configuration' on page 478.
Parameter
Index
[NATTranslation_Index]
Source Interface Name
[NATTranslation_SourceIPInterface
Name]
Target IP Address
[NATTranslation_TargetIPAddress]
Source Start Port
[NATTranslation_SourceStartPort]
Source End Port
[NATTranslation_SourceEndPort]
Target Start Port
[NATTranslation_TargetStartPort]
Target End Port
[NATTranslation_TargetEndPort]
SIP User's Manual
Figure 14-4: NAT Translation Table Page
Table 14-5: NAT Translation Table Parameters
Defines the table index entry. This table can include up to 32
entries.
Defines the name of the IP interface, as appears in the
Multiple Interface table.
Note: If the Multiple Interface table is not configured, the
default Source IP Interface Name is "All". This represents the
single IP interface for OAMP, Control, and Media (defined by
the LocalOAMIPAddress, LocalOAMSubnetMask, and
LocalOAMDefaultGW parameters).
Defines the global IP address.
Defines the optional starting port range (1-65536) of the
global address. If no ports are required, leave this field blank.
Defines the optional ending port range (1-65536) of the
global address. If no ports are required, leave this field blank.
Defines the optional starting port range (1-65536) of the IP
interface. If no ports are required, leave this field blank.
Defines the optional ending port range (1-65536) of the IP
interface. If no ports are required, leave this field blank.
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Description
Document #: LTRT-89712
Mediant 3000