[Bug 231575] [IFCONFIG(8)] group improvements

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231575

            Bug ID: 231575
           Summary: [IFCONFIG(8)] group improvements
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Manual Pages
          Assignee: bugs at FreeBSD.org
          Reporter: pekka.jarvinen at gmail.com
                CC: doc at FreeBSD.org

Hello!

man page:
group group-name
  Assign the interface to a group. Any interface can be in multiple groups.
  Cloned interfaces are members of their interface family group by
  default. For example, a PPP interface such as ppp0 is a member
  of the PPP interface family group, ppp.

My questions:
- So what is a group actually? What it does or doesn't do to those interfaces?
Is it simply cosmetic?
- When I need to (or not) assign something to group?
- Are there security implications with group?
- Are there performance implications with group?

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