Re: dhcpcd(8) into FreeBSD base

On 6/19/2025 04:21, Ronald Klop wrote:
> Hi,
>
> I don't know the details about your setup, but I tried dhcpcd in my 
> network last few months and I encountered that it:
>
> - runs fine in a 14.X jail on a 14.X machine (RPI3B) for both IP4 and 
> IP6 👍
> - it does not work well on a 14.X jail on a 15.x machines. (RPI4)
>
> 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.
> 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.
>
> 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.
>
> I didn't run dhcpcd yet on the host OS yet as I was first testing it 
> in the VNET jails.
>
> Just my 2 cents.
>
> Regards,
> Ronald.
>
Now that's very curious.

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?

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.

-- 
Karl Denninger
karl@denninger.net
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