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ClusterXL HA - Adding interface on only 1 unit

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I have a CusterXL HA setup (2 units), And a 2nd small external IP range that I'll be migrating over to our checkpoint firewall.

I only have 1 IP address available to define an interface with on our cluster in that IP range (With future plans to put everything behind a reverse proxy, to free up addresses so I can do a proper HA setup).

Is it okay to add an additional interface on only one of the units (active), and reference that IP in the Proxy ARP ? I'm not sure if this will have any bad interactions with ClusterXL, as all my other interfaces in the cluster are setup properly with VIPs. I don't expect any bad behavior, but I'd like to see if anyone else has done this, and their experiences.

I know this will make the services unavailable if there is a failover, but that has been deemed acceptable for us in the short term.

*edited for spelling

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