dhcpcd-discuss

Hi Michael

On 18/01/2021 11:38, Michael Aldridge wrote:
> I was recently debugging a problem with the metadata provider in
> linuxkit and was able to track it down to the machine not having an IPv4
> address, but having an IPv6 address.  I was quite surprised by this, as
> the config file provided to dhcpcd includes 'waitip 4' at the bottom
> [1].  I figured perhaps because the --nobackground and -1 options were
> also being passed this might interfere with the config file, so I passed
> --waitip=4 to the task and rebooted.  Again I observed that an IPv6
> address was obtained and not an IPv4 one.  I have since had success by
> completely turning off IPv6 support in the boot-time one-shot service by
> passing -4 to the command arguments, but this feels like a hack.
>
> Is waitip not what I should be using here?  It seems like what I want
> from the man page, but dhcpcd is for sure not waiting on an IP in this
> configuration, so I wonder if this isn't right.  If this turns out to be
> a bug I'm happy to writeup a more detailed inventory of how dhcpcd is
> configured.
>
> [1] https://github.com/linuxkit/linuxkit/blob/master/pkg/dhcpcd/dhcpcd.conf

Well, it looks like it should work fine.
Do you pass any extra stuff via the command line when starting dhcpcd?
Also, what version are you running?

Some debug logs may help as well.
Add this to the top of the config:

debug
logfile /var/log/dhcpdc.log

restart dhcpcd and the logfile should hopefully be verbose enough.

Roy