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Date:      Sat, 09 Jun 2018 19:26:13 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 228852] e1000 back-to-back unable to negotiate link...
Message-ID:  <bug-228852-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D228852

            Bug ID: 228852
           Summary: e1000 back-to-back unable to negotiate link...
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: seanc@FreeBSD.org

Using two back-to-back e1000 Ethernet adapters, neither NIC negotiates to u=
p.=20
The max link speed is 100baseTX but setting auto-negotiate refuses to estab=
lish
link.  This may be an MDI-X problem.

CC shurd@

% doas ifconfig em0 media 1000baseT mediaopt full-duplex
% ifconfig em0
em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
=20=20=20=20=20=20=20
options=3D85259b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,LRO=
,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO>
        ether 50:7b:9d:a3:d9:d0
        inet6 fe80::527b:9dff:fea3:d9d0%em0 prefixlen 64 scopeid 0x1=20
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255=20
        nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL>
        media: Ethernet 1000baseT <full-duplex> (autoselect)
        status: no carrier

--=20
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