RealTek 2.5 GbE (RTL8125) support?

Jerry jerry at
Thu Jun 25 14:22:44 UTC 2020

On Thu, 25 Jun 2020 09:19:52 -0400, Chris Gordon stated:
>> On Jun 24, 2020, at 10:08 PM, Mel Pilgrim
>> <list_freebsd at> wrote:
>> On 2020-06-18 16:43, Chris Gordon wrote:  
>>>> On Jun 18, 2020, at 10:40 AM, Mel Pilgrim
>>>> <list_freebsd at> wrote:
>>>> Are RealTek 2.5 GbE NICs () supported?  I don't see RLT8125 parts
>>>> listed in if_re(4) or if_re.c, and that appears to be the only
>>>> driver for RealTek gigabit NICs?  
>>> I don't know if that specific chipset is supported, but based on
>>> experience with re(4) 1 Gbps NICs, I would avoid it like the plague.
>>> I have several home "servers" with on board re(4) NICs (disabled in
>>> firmware now, so I can't get the specific chipset).  I would have
>>> random connectivity problems such as samba shares randomly
>>> disappearing or systems becoming unresponsive over the network,
>>> especially during a file transfer (size didn't matter).  While
>>> annoying, I never spent the time to get to the bottom of it.  One
>>> day I actually paid some attention to /var/log/messages and saw
>>> frequent, random link state changes (DOWN then UP) across all of
>>> the machines. From some googling, this seems to be a common issue.
>>> Replaced them all with some Intel em(4) NICs and things have been
>>> solid since. Hope that helps.  
>> I appreciate your feedback, but I'm not sure how complaining about
>> other hardware is answering whether or not this one is supported?  
>I agree that doesn't answer the specific question of "is this
>particular RealTek chipset supported".  The point I was really trying
>to make is that, in my experience, RealTek NICs have performed so
>poorly that I would avoid them completely thereby making the status of
>their support irrelevant.  Again, my anecdote was intended to direct
>you away from a path that may have more pain in it than you want.

I have experienced the "UP" and "DOWN" phenomena on machines I used;
however, that only occurred on the FreeBSD machines. I therefore
question you assessment of the situation. Is it really RealTex NICs that
are substandard or is the FreeBSD supplied driver at fault? It is my
belief that this is 1) something that deserves to be studied in-dept,
and 2) it isn't going to happen, at least not at the retail level.


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