Problem with interface em0 - fresh install FreeBSD 12

Ernie Luzar luzar722 at
Thu Mar 28 12:10:39 UTC 2019

Robert Huff wrote:
> Ernie Luzar writes:
>>  Is your em0 built into the motherboard or a plug in board.
>>  My em0 and em1 were built in on the motherboard. Had no problems release 
>>  9 through 11. For 12.0 started having network problems. Disabled them in 
>>  bios and replaced with PCIE type plug in cards. Every thing back to normal.
> 	For the record: mine is a two port add-on, about 10 years old.
> It is reported by pciconf as:
> em0 at pci0:3:6:0:	class=0x020000 card=0x10128086 chip=0x10108086 rev=0x01 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '82546EB Gigabit Ethernet Controller (Copper)'
>     class      = network
>     subclass   = ethernet
> 	As far as I know ... on-board or add-on shouldn't matter.  If it
> does, and if this has changed from 11 to 12, someone should open a bug
> and point to this thread.
> 			Respectfully,
> 				Robert Huff

It's not on-board verse plug-in. It's the bus type that is the problem.
And it effects more than just em0, xl0 and some others. Bus type PCIE is 
what newer motherboards use. It's time to update your hardware to 
something less that 2 years old.

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