This article describes the issue of the KERN_ARP_DUPLICATE_ADDR syslog message being generated in the chassis cluster for the Fxp0 interface.
Unable to manage the chassis cluster nodes via the FXP0 interface.
The following activities are noticed:
The /kernel: KERN_ARP_DUPLICATE_ADDR syslog message is generated. The duplicate IP address <ip address> is sent from address: < mac-address >.
The connection is dropped and pings are also dropped.
The login is switching between node 0 and node 1.
Incorrect fxp0 configuration :
Fxp0 is an out of band management interface that is used to manage the device.
You have to exclusively configure the fxp0 interface for each node. If they are globally configured, it will be for both of the nodes and this could cause IP conflict.
IP conflict occurs when 2 ports reply with the same IP address for an ARP request.
To eliminate such issues, configure them under the groups [edit groups] hierarchy for individual nodes and do not have any global FXP0 configuration.
For the correct FXP0 configuration in High Availability, refer to KB17161-Cannot manage SRX via fxp0 in chassis cluster [juniper.net] .
2020-07-18: Article reviewed for accuracy; no changes required.