Date: Fri, 20 Jun 2025 09:24:42 -0400 From: Karl Denninger <karl@denninger.net> To: freebsd-net@freebsd.org Subject: Re: dhcpcd(8) into FreeBSD base Message-ID: <5f4fe904-dda8-42d8-8325-dd3bb0403df8@denninger.net> In-Reply-To: <1188806329.62817.1750321263908@localhost> References: <e401671f-6a67-49ed-bc41-e8fbb9de27cb@www.fastmail.com> <CAPyFy2BackF0FshyjfV6qoOoJjFqiqcu%2BVxx9X_%2BRHpepOXTsw@mail.gmail.com> <18ff2d4772a.129dde187836962.5411001908566459400@marples.name> <bf3f1d62-70bb-4191-82ae-d8c9358d0b47@denninger.net> <1188806329.62817.1750321263908@localhost>
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<div class=3D"moz-cite-prefix">On 6/19/2025 04:21, Ronald Klop wrote:=
<br>
</div>
<blockquote type=3D"cite"
cite=3D"mid:1188806329.62817.1750321263908@localhost">
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Hi,<br>
<br>
I don't know the details about your setup, but I tried dhcpcd in
my network last few months and I encountered that it:<br>
<br>
- runs fine in a 14.X jail on a 14.X machine (RPI3B) for both IP4
and IP6 =F0=9F=91=8D<br>
- it does not work well on a 14.X jail on a 15.x machines. (RPI4)<b=
r>
<br>
The symptoms look a lot like what you describe. Sometimes it got
an address and a day later it was gone again. Restarting sometimes
helped, often didn't change anything.<br>
Up to the point that I started reading to code of dhcpcd and
encountered that it writes a line in the log about getting a lease
and the next statement was sending a packet out on the network and
I never see that packet in tcpdump.<br>
<br>
Anyway on the RPI3 I still use it. On the RPI4 I went back to
dhclient + SLAAC after I put a lot of time in tcpdumping and
testing. Maybe it is just that 14 userland doesn't match enough
with 15 kernel to do BPF/dhcp. But than again.... with dhclient it
works fine.<br>
<br>
I didn't run dhcpcd yet on the host OS yet as I was first testing
it in the VNET jails.<br>
<br>
Just my 2 cents.<br>
<br>
Regards,<br>
Ronald.<br>
<br>
</blockquote>
<p>Now that's very curious.</p>
<p>Could you (where you can control what's going on with the other
end, which I can't) try again with "noip4ll" and "noarp" and see
if you still get the oddness?</p>
<p>I have a suspicion this is the cause (from the docs "noarp"
should be enough to disable both, but never hurts to stick 'em
both in there) -- and if so then perhaps default behavior should
be changed.</p>
<div class=3D"moz-signature">-- <br>
Karl Denninger<br>
<a href=3D"mailto:karl@denninger.net" class=3D"moz-txt-link-freetex=
t">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size=3D"-2"><i>[S/MIME encrypted email preferred]</i></font><=
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