[Bug 263156] [carp] packet structure

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263156

            Bug ID: 263156
           Summary: [carp] packet structure
           Product: Base System
           Version: 13.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: konrad.kreciwilk@korbank.pl
                CC: net@FreeBSD.org

Hello,

I try to configure configure CARP which will be work with Host B (Linux,
keepalived). I am unable to get working configuration. I suppose that problem
is with packet`s structure. Linux VRRPv2 contains addrs field with configured
IP Addresses:

10.70.xx.x > 224.0.0.18: vrrp 10.70.xx.xx > 224.0.0.18: VRRPv2, Advertisement,
vrid 10, prio 200, authtype none, intvl 1s, length 24, addrs(2):
193.239.xx.xx,79.110.xx.xx

while FreeBSD carp has static "Count IP Addrs"=7 and random "IP Address" list:

10.70.xx.xx > 224.0.0.18: vrrp 10.70.xx.xx > 224.0.0.18: VRRPv2, Advertisement,
vrid 10, prio 100, authtype none, intvl 1s, length 36, addrs(7):
138.251.232.234,8.37.228.32,75.126.253.182,83.89.247.84,103.15.24.17,44.191.75.220,177.93.114.226


https://datatracker.ietf.org/doc/html/rfc3768

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