Snmp Nat Traversal - AudioCodes Mediant 1000 User Manual

User's Manual
All changes to the trap destination configuration take effect immediately.
To delete a trap destination, take this step:
Remove the appropriate row from the snmpTargetAddrTable.
To modify a trap destination, take this step:
You can change the IP address and or port number for an existing trap destination. The
same effect can be achieved by removing a row and adding a new row.
Modify the IP address and/or port number for the appropriate row in the
snmpTargetAddrTable.
To disable a trap destination, take this step:
Change TagList on the appropriate row in the snmpTargetAddrTable to the empty
string.
To enable a trap destination, take this step:
Change TagList on the appropriate row in the snmpTargetAddrTable to "AC_TRAP".
8.1.5.4.4 SNMP Manager Backward Compatibility
With support of the Multi Manager Trapping feature, there is also a need to support the
older acSNMPManagerIP MIB object, which is synchronized with the first index in the
snmpManagers MIB table. This is translated in two new features:
SET/GET to either of the two; is for now identical.
i.e. OID 1.3.6.1.4.1.5003.9.10.1.1.2.7 is identical
to OID 1.3.6.1.4.1.5003.9.10.1.1.2.21.1.1.3 as far as the SET/GET are concerned.
When setting ANY IP to the acSNMPManagerIP (this is the older parameter, not the
table parameter), two more parameters are SET to ENABLE. snmpManagerIsUsed.0
and snmpManagerTrapSendingEnable.0 are both set to 1.
8.1.6

SNMP NAT Traversal

A NAT placed between a <product Name> and the element manager calls for traversal
solutions:
Trap source port – all traps are sent out from the SNMP port (default – 161). A
manager receiving these traps can use the binding information (in the UDP layer) to
traverse the NAT back to the device.
The trap destination address (port and IP) are as configured in the snmpTargetMIB.
acKeepAliveTrap – this trap is designed to be a constant life signal from the device to
the manager allowing the manager NAT traversal at all times. The
acBoardTrapGlobalsAdditionalInfo1 varbind has the device's serial number.
The Trap is instigated in three ways:
•
Via an ini file parameter - 'SendKeepAliveTrap = 1'. This ensures that the trap is
continuously sent. The frequency is set via the 9/10 of the
NATBINDINGDEFAULTTIMEOUT (or MIB object - acSysSTUNBindingLifeTime)
parameter.
Version 4.6 131
8. Mediant 1000 Management
August 2005