Re: [gentoo-user] root on nfs and multiple ip addresses

[William Kenworthy]

On 19/3/21 7:18 pm, Gerrit Kuehn wrote:
> On Wed, 17 Mar 2021 15:59:01 +0800
> William Kenworthy <billk@×××××××××.au> wrote:
>
>
>> I have been moving away from fixed IP's using scripts to
>> update via dynamic DNS (which is why two IP numbers per MAC are
>> problematic).
> Joost was probably not suggesting the use of static IPs here, he was
> suggesting to fix a certain MAC to a certain IP employing dhcp (or I
> didn't understand properly what you both are talking about here ;-).
>
>> Interestingly, dhcp issues the same IP addresses consistently to both
>> the boot process and OS.  While stopping the OS requesting an address
>> is easy enough ... the question is why is that necessary.  Google
>> shows a number of recommendations and howtos saying to do just that
>> but it seems a "kludge".
> Did you make sure that the two IPs are issued to the same MAC? I don't
> have much experience with the ISC server, but I'd think this should not
> happen.
> Just a wild guess: does the client update its time (by running
> ntpclient or similar) during boot so it might think different about the
> age of its dhcp lease than the server?
>
>
> cu
>   Gerrit
>
Yes, its two IP's to the same MAC address.  Its a raspberry pi 3B using
swclock so time may be an issue though I dont see how, but its still a
different IP for each stage, but the logs are showing the same MAC
address.  Google shows its a known problem and not just me - but its a
reason why and then a better fix than stopping the OS from starting its
interface that I am looking for.  Yes I understand what Joost is getting
at and I do want to test it but I have a delay:

Unfortunately an ill advised "rm -rf" in my storage system has left me
restoring 7TB of data, so it will be a couple of days more before I have
time again - thank-you borgbackup - you are a life saver!!!!

BillK