[Bug 277687] [regression] IPv4 link-level problem with ng(4)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277687

            Bug ID: 277687
           Summary: [regression] IPv4 link-level problem with ng(4)
           Product: Base System
           Version: 13.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: eugen@freebsd.org
                CC: melifaro@FreeBSD.org

Since upgrade from early 13.2-STABLE to 13.3-STABLE/amd64 the following
regression  affects my mpd5/L2TP client installation using verified mpd5
configuration: after successfull L2TP connection ifconfig ng0 shows:

ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu
576
        inet 0.0.0.0 --> 255.255.255.255 netmask 0xff000000
        inet 192.168.71.82 --> 192.168.71.81 netmask 0xffffffff

Note extra "inet 0.0.0.0" line that does not appear with FreeBSD 13.2. This is
not cosmetic problem as it somehow corrupts routing lookup results in some
cases.

A work-around: "ifconfig ng0 0.0.0.0/8 -alias" added to up-script of mpd5. This
command fixes routing lookups.

The problem may be related to the following MFC:

https://cgit.freebsd.org/src/commit/?h=stable/13&id=ec4ae38566569bfac4e18e1fb2ce61fec1e2361b

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