dhcp with /etc/network/interfaces

[Martin Townsend]

Hi David,

I've had a quick look through the ifupdown code what DHCP binary gets
called and with what parameters is specific to how you've configured
busybox.
If you have the full version of ps you may be able to see the full
command line using ps aux.  Maybe the busybox version will show this
information as well.
Another way which would be hard to capture is
cat /proc/pid/cmdline
but the problem is obtaining pid and then performing the cat command.
If you kick off the DHCP without a network cable plugged in, the
process should hang around a whilst it's sending it's DISCOVER
messages.

If this fails I would try and get strace on the board.  Can't you run
udhcpc/dhclient with the board connected to a network with a DHCP
server? USB Memory Stick?

-Martin.


On Tue, Sep 20, 2016 at 2:54 PM, David Henderson
<dhenderson at digital-pipe.com> wrote:
> Good morning all, I was just following up with this.
>
> Thanks,
> Dave
>
>
> On 9/19/16, David Henderson <dhenderson at digital-pipe.com> wrote:
>> Plus that would only answer part of the original question.  Any input
>> on that second part?
>>
>> Thanks,
>> Dave
>>
>>
>> On 9/19/16, David Henderson <dhenderson at digital-pipe.com> wrote:
>>> Thanks again for your continued help Peter!  Unfortunately the machine
>>> that I'm working on doesn't currently have a network connection since
>>> I've been fiddling with things so strace can't be installed.
>>>
>>> Dave
>>>
>>>
>>> On 9/19/16, Peter Korsgaard <peter at korsgaard.com> wrote:
>>>>>>>>> "David" == David Henderson <dhenderson at digital-pipe.com> writes:
>>>>
>>>>  > Good morning Peter, thanks for your reply.  C/C++ is not my forte and
>>>>  > while it may be readable for you, it may not be for others.
>>>>
>>>> Then use strace as I suggested.
>>>>
>>>> --
>>>> Bye, Peter Korsgaard
>>>>
>>>
>>
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