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PhoneBoy
Admin
Admin

The main IP (configured in the relevant object on the general tab) is used for communication between the gateway and management.
As long as those IPs are reachable to each other bidirectionally, you should be fine.

Another feature that uses the main IP by default is VPN (both Site-to-Site and Remote Access).
If you need to use something other than the external IP there, then you probably will need to adjust the Link Selection setting to use a different IP.

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