Problem with DHCP during boot - Devuan Beowulf

[glenn.satchell at uniq.com.au]

Hi SImon,

I'm no Devuan expert, but your suggestion seems reasonable.

Is there some Debian interface config left behind that needs to be 
removed? Perhaps the upgrade wasn't perfect and should have cleaned this 
up? Without systemd I guess it is using the sysv scripts, so look in 
/etc/init.d for things that call dhcp and also in the runtime 
directories (/etc/rc*.d usually) to see if there is something that needs 
to be unlinked?

regards,
-glenn

On 2020-07-16 07:10, Simon Hobson wrote:
> I think this is more an OS question than a DHCP one, but I'm hoping
> someone here might have an idea.
> 
> I've got a VM running Devuan Beowulf that was upgraded from Debian
> Wheezy (via Devuan Ascii). Devuan being "Debian without SystemD".
> 
> The problem I have is that it keeps getting different IP addresses
> during boot, never the one the DHCP server is configured (reserved
> lease) to give it. On tracing packets, I see that it's using a
> different DUID value during boot than it uses if I manually take the
> interface down and back up (ifdown eth0;ifup eth0 when the system is
> running). Also, during boot I see the message "Configuring network
> interfaces...ifup: interface eth0 already configured".
> 
> This suggests to me that something is bringing up the interface early
> during boot, using a different or non-existant DHCP Client config. I
> suspect non-existant since the address leased changes every boot which
> suggests a different DUID. I just can't see how/where the interface is
> being brought up .
> 
> 
> From my packet trace, I'm seeing the client sending :
>    Option: (61) Client identifier
>        Length: 19
>        IAID: 3e10c4f2
>        DUID type: link-layer address plus time (1)
>        Hardware type: Ethernet (1)
>        Time: 648121466
>        Link-layer address: 02:16:3e:10:c4:f2
> 
> Time: 648121466 is what I consistently get bringing up the interface
> manually *after* booting. During boot I get different Time values - so
> the DUID is different, so the DHCP server treats it as a different
> client.
> Looking at two different packet traces, I see values of 648143408 and
> 648121466, puts them about 75 minutes apart which ties in with the
> timestamps of my packet capture files.
> 
> Can anyone give me any hint as to what is bringing up the network
> before it is supposed to be ?
> 
> Simon
> 
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