[Bug 263898] SIOCGIFMTU not mentioned in netintro(4)

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 10 May 2022 15:39:04 UTC

            Bug ID: 263898
           Summary: SIOCGIFMTU not mentioned in netintro(4)
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Manual Pages
          Assignee: bugs@FreeBSD.org
          Reporter: xyesbee@protonmail.com
                CC: doc@FreeBSD.org

netintro(4) does not mention a useful ioctl(), SIOCGIFMTU (Socket IO Channel
Get Interface MTU). This is mentioned in OpenBSD's netintro(4) man page and
Linux's netdevice(4) man page (man7.org).

FreeBSD's documentation is however in if_allmulti(9). It would've been better
to put it there because knowing the MTU is useful.

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