[Bug 259717] Intel I211: can not change mtu

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259717

            Bug ID: 259717
           Summary: Intel I211: can not change mtu
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rozhuk.im@gmail.com

MTU does not change after:
ifconfig igb0 mtu 9000 down up
ifconfig igb0 mtu 1000 down up

It fixed to 1500 some how.


FreeBSD 13 amd64, build from commit: df838c540632ce3840f78a9067dd9de32458c71a
Asrock Fatal1ty B450 Gaming-ITXac + 3200G.

igb0@pci0:8:0:0:        class=0x020000 rev=0x03 hdr=0x00 vendor=0x8086
device=0x1539 subvendor=0x1849 subdevice=0x1539
    vendor     = 'Intel Corporation'
    device     = 'I211 Gigabit Network Connection'
    class      = network
    subclass   = ethernet

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