[Bug 191832] New: carp breaks the network

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191832

            Bug ID: 191832
           Summary: carp breaks the network
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: [e-mail]
          Reporter: [e-mail]

When creating a carp initialises we're seeing it break the existing mast.

The reason being it adds the IP to the physical interface before it configures
the custom MAC. This results in network devices e.g. cisco switches learning
the wrong MAC for the address.

Once this happens the BACKUP sees traffic instead of the MASTER.

Having a look through seems to confirm the ordering of IP -> MAC assignment
could well be incorrect.

This is a major issue when using CARP as it means is highly unreliable :(

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