Date: Tue, 5 Jul 2022 19:37:42 -0400 From: Karl Denninger <karl@denninger.net> To: freebsd-arm@freebsd.org Subject: Re: duplicate MAC - Re: 13.1R problems on Pi3 Message-ID: <0cd9ee13-9340-8bc4-2b92-171ca83534ee@denninger.net> In-Reply-To: <20220705233440.GA9228@www.zefox.net> References: <20220704003639.GA1165@www.zefox.net> <8820A9EC-A25E-4D0A-9F8F-52114E58B66F@yahoo.com> <6c377413-9430-54d2-3f92-1215055ca30a@denninger.net> <20220704152834.GA1771@www.zefox.net> <7ce87eef-ded5-8b00-3f11-14407b8af78d@denninger.net> <20220704182526.GB1771@www.zefox.net> <212C86C0-17DB-45F5-A59D-8BDC1932378E@yahoo.com> <1645012198.135.1657014956867@localhost> <6B24FF55-7010-40ED-B32B-AA46F0E7ED80@yahoo.com> <20220705233440.GA9228@www.zefox.net>
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On 7/5/2022 19:34, bob prohaska wrote:
> On Tue, Jul 05, 2022 at 07:02:18AM -0700, Mark Millard wrote:
>
>>> So for you I would guess:
>>>
>>> ifconfig_ue0="ether ??:??:??:??:??:?? inet 50.1.20.28 netmask 255.255.255.0"
>
> I tried a few variants, all produced a dead connection.
>
> Using one like you suggested:
>
> # ethernet address increased by 1 in the last digit
> ifconfig ue0="ether b8:27:eb:71:46:4f inet 50.1.20.28 netmask 255.255.255.0"
>
> produced a flood of errors during boot:
> ifconfig: interface ue0=ether b8:27:eb:71:46:4f inet 50.1.20.28 netmask 255.255.255.0 does not exist
>
> There was clearly no network connectivity, but the serial console
> remained responsive. The host sharing the same MAC address exhibited
> no connectivity problems.
>
>
> Another suggestion was found in an old forum post, assigning the IP
> in the usual fashion but adding an alias:
>
> ifconfig_ue0="inet 50.1.20.28 netmask 255.255.255.0"
> ifconfig_ue0_alias0="link b8:27:eb:71:46:4f"
> (trading ether for link had no effect)
>
> resulted in the gateway (and everything else) being unreachable.
>
> Thanks for writing!
>
> bob prohaska
Crap - you have to see if you can get u-boot (e.g. in config.txt) to do
it then.... that's not supposed to happen (manufacturing two devices
with the same MAC address) and is EXTREMELY not-nice for the very reason
you've discovered. Linux's boot line has an override available for it,
so there IS a way.
--
Karl Denninger
karl@denninger.net
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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<div class="moz-cite-prefix">On 7/5/2022 19:34, bob prohaska wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20220705233440.GA9228@www.zefox.net">
<pre class="moz-quote-pre" wrap="">On Tue, Jul 05, 2022 at 07:02:18AM -0700, Mark Millard wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">So for you I would guess:
ifconfig_ue0="ether ??:??:??:??:??:?? inet 50.1.20.28 netmask 255.255.255.0"
</pre>
</blockquote>
</blockquote>
<pre class="moz-quote-pre" wrap="">
I tried a few variants, all produced a dead connection.
Using one like you suggested:
# ethernet address increased by 1 in the last digit
ifconfig ue0="ether b8:27:eb:71:46:4f inet 50.1.20.28 netmask 255.255.255.0"
produced a flood of errors during boot:
ifconfig: interface ue0=ether b8:27:eb:71:46:4f inet 50.1.20.28 netmask 255.255.255.0 does not exist
There was clearly no network connectivity, but the serial console
remained responsive. The host sharing the same MAC address exhibited
no connectivity problems.
Another suggestion was found in an old forum post, assigning the IP
in the usual fashion but adding an alias:
ifconfig_ue0="inet 50.1.20.28 netmask 255.255.255.0"
ifconfig_ue0_alias0="link b8:27:eb:71:46:4f"
(trading ether for link had no effect)
resulted in the gateway (and everything else) being unreachable.
Thanks for writing!
bob prohaska
</pre>
</blockquote>
<p>Crap - you have to see if you can get u-boot (e.g. in config.txt)
to do it then.... that's not supposed to happen (manufacturing two
devices with the same MAC address) and is EXTREMELY not-nice for
the very reason you've discovered. Linux's boot line has an
override available for it, so there IS a way.<br>
</p>
<div class="moz-signature">-- <br>
Karl Denninger<br>
<a href="mailto:karl@denninger.net" class="moz-txt-link-freetext">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size="-2"><i>[S/MIME encrypted email preferred]</i></font></div>
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