User's Manual
142
Document #: LTRT-10375
Mediant 500 MSBR
15.2.1.2 Configuring NAT Translation per IP Interface
The NAT Translation table lets you configure up to 32 network address translation (NAT)
rules for translating source IP addresses per VoIP interface (SIP control and RTP media
traffic) into NAT IP addresses (
global -
public
) when the device is located behind NAT. The
device's NAT traversal mechanism replaces the source IP address of SIP messages sent
from a specified VoIP interface to a public IP address. This allows, for example, the
separation of VoIP traffic between different ITSPs and topology hiding of internal IP
addresses from the “public” network. Each IP network interface can be associated with a
NAT rule, translating the source IP address and port of the outgoing packet into the NAT
address (IP address and port range).
If the device is configured with two network interfaces, for example, one LAN and one
WAN, only one NAT rule is required and without specifying ports. This rule is defined with
the network interface representing the WAN and with a public IP address. If the device is
configured with only one network interface (e.g., "Voice") and you have an SRD configured
for WAN and LAN, then you need to specify ports in order to differentiate between these
SRDs. In such a scenario, the device replaces the source IP address only for messages
sent from the WAN SRD, not from the LAN SRD.
The following procedure describes how to configure NAT translation rules through the Web
interface. You can also configure it through ini file (NATTranslation) or CLI (configure
network > nat-translation).
To configure NAT translation rules:
1.
Open the NAT Translation table (
Setup
menu >
IP Network
tab >
Core Entities
folder >
NAT Translation
).
2.
Click
New
; the following dialog box appears:
Figure
15-4: NAT Translation Table - Dialog Box
3.
Configure a NAT translation rule according to the parameters described in the table
below.
4.
Click
Apply
, and then save your settings to flash memory.
Table
15-1: NAT Translation Table Parameter Descriptions
Parameter
Description
Source
Index
index
[NATTranslation_Inde
x]
Defines an index number for the new table row.
Note:
Each row must be configured with a unique index.
Summary of Contents for Mediant 500 MSBR
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Page 137: ...Part IV General VoIP Configuration ...
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