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IPsec tunnel not stable between USG6660 and ALU router

Publication Date:  2017-08-01 Views:  119 Downloads:  0
Issue Description

Description :-

As per below diagram , establish IPsec tunnel between  USG6660 and ALU router for secured data transfer use FTP.

IPsec tunnel not stable . it keep wend down

Network Diagram :-


Handling Process

Perform the  continues ping operation to check P2P link stability between USG600 and ALU. while ping IPsec tunnel stable .

after stop the continues ping again IPsec tunnel wend down . 



Root Cause

Continues ping result we found that , there is heartbeat issue . we checked ALU node heartbeat rate by default 30sec

after set dpd retransmission interval time 30sec on USG6660  (dpd retransmit-interval 30)  . IPsec tunnel stable , there is no interrupted.


DPD (Dead Peer Detection) has to be employed in USG6660 for stable and uninterrupted connectivity.

Type of DPD chosen was "periodic" and the retransmit-interval of DPD packet is 30 seconds which is default for our ALU MPLS node.

ALU node will "reply only" to DPD packets sent by this USG6660.