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Re: Problem with DHCP during boot - Devuan Beowulf (glenn.satch...@uniq.com.au) ---------------------------------------------------------------------- Message: 1 Date: Wed, 15 Jul 2020 22:10:59 +0100 From: Simon Hobson <si...@thehobsons.co.uk> To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Problem with DHCP during boot - Devuan Beowulf Message-ID: <cc6ae806-7373-46cb-8513-746311a1e...@thehobsons.co.uk> Content-Type: text/plain; charset=us-ascii 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 ------------------------------ Message: 2 Date: Thu, 16 Jul 2020 10:46:08 +1000 From: glenn.satch...@uniq.com.au To: Users of ISC DHCP <dhcp-users@lists.isc.org> Subject: Re: Problem with DHCP during boot - Devuan Beowulf Message-ID: <8ba616f78aa93a5f5a1838152de43...@uniq.com.au> Content-Type: text/plain; charset=US-ASCII; format=flowed 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 > > _______________________________________________ > ISC funds the development of this software with paid support > subscriptions. Contact us at https://www.isc.org/contact/ for more > information. > > dhcp-users mailing list > dhcp-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/dhcp-users ------------------------------ Subject: Digest Footer _______________________________________________ ISC funds the development of this software with paid support subscriptions. 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