dhcpd, iscsi and a raspberry pi

[Guy Harrison]

Hi John,

On Tuesday 15 March 2016 19:46:26 John Howie wrote:
> Hi Guy,
>
> When the Raspberry Pi boots it will use DHCP several times. The first is
> in UBOOT, and twice when the kernel boots (based on my own observations,
> and configuration). Using Windows Server DHCP Server, I was able to use
> the MAC address to guarantee that the Pi got the same IP address each
> time. Your mileage with ISC-DHCPD may vary. I am no expert with that DHCP
> server so can offer no advice on how to make it work in a similar fashion
> to Windows Server.

I can achieve a similar result to yourself by editing dhcpd.conf to insert 
the MAC..

host pi05	{
	hardware ethernet	b8:27:eb:0f:32:64;
	fixed-address		pi05.swampdog;
}

..and inserting A/PTR forward and reverse records for 'named' so at least 
that prevents the dual IP allocation.

There's always a catch: the background on this is I can't have the pi 
hostname tried to the hardware - it needs to follow the sdcard around 
iyswim.

I guess the question now is - how can I achieve the same result but without 
needing the above in dhcpd.conf?

TIA
Guy

> Regards,
>
> John
>
> On 3/15/16, 10:55 AM, "owner-freebsd-questions at freebsd.org on behalf of 
Arthur Chance" <owner-freebsd-questions at freebsd.org on behalf of 
freebsd at qeng-ho.org> wrote:
> >On 15/03/2016 17:52, Arthur Chance wrote:
> >> On 15/03/2016 16:32, Guy Harrison wrote:
> >>> HI Folks,
> >>>
> >>> I just wanted to check I'm getting correct behaviour 'cos I'm no
> >>> expert on these things!
> >>>
> >>> I've built an iscsi enabled kernel for the raspberry pi (aka debian
> >>> jessie)
> >>
> >> You're asking about Debian, a Linux distro, on a FreeBSD mailing list.
> >> Not quite as bad as asking about Windows on a Mac OS list, but you'd
> >> be much better off find a Debian mailing list to ask on. Try looking
> >> here
> >>
> >> https://www.debian.org/MailingLists/
> >
> >Ack, shouldn't be so hasty, just spotted your uname -a below. That 8.2
> >is way out of date though. I'll let someone better versed in dhcpd
> >handle the rest.
> >
> >>> and the initrd is obtaining a first IP address then when the kernel
> >>> proper boots a second IP address is obtained. Both are bound to eth0.
> >>>
> >>> [admin at sdvmf64dns ~/etc]$ dhcpd --version
> >>> isc-dhcpd-V3.1.2p1
> >>>
> >>> [admin at sdvmf64dns ~]$ uname -a
> >>> FreeBSD sdvmf64dns.swampdog 8.2-RELEASE-p4 FreeBSD 8.2-RELEASE-p4 #1:
> >>> Thu Oct 27 14:26:36 BST 2011
> >>> root at sdvmf64dns.swampdog:/usr/obj/usr/src/sys/GENERIC  amd64
> >>>
> >>> The problem is the second IP address is "known" in that 'nslookup'
> >>> knows the pi name and so forth..
> >>>
> >>> lease 192.168.1.45 {
> >>>   starts 4 2016/03/10 14:55:05;
> >>>   ends 4 2016/03/10 15:05:05;
> >>>   cltt 4 2016/03/10 14:55:05;
> >>>   binding state active;
> >>>   next binding state free;
> >>>   hardware ethernet b8:27:eb:0f:32:64;
> >>>   uid "\001\270'\353\0172d";
> >>>   set ddns-rev-name = "45.1.168.192.in-addr.arpa";
> >>>   set ddns-txt = "318788caec8944734a9e0c2fe418c9db6f";
> >>>   set ddns-fwd-name = "pi05.swampdog";
> >>>   client-hostname "pi05";
> >>> }
> >>>
> >>> ..whereas the first IP..
> >>>
> >>> lease 192.168.1.53 {
> >>>   starts 3 2016/03/09 14:09:27;
> >>>   ends 3 2016/03/09 14:19:27;
> >>>   tstp 3 2016/03/09 14:19:27;
> >>>   cltt 3 2016/03/09 14:09:27;
> >>>   binding state free;
> >>>   hardware ethernet b8:27:eb:0f:32:64;
> >>> }
> >>>
> >>> ..only appears the once, on boot. This is the IP address by which the
> >>> iscsi target knows the pi and it expires!
> >>>
> >>> I was expecting the first *.53 IP to be inherited by the kernel
> >>> rather than it go obtain the second *.45 IP address. Is correct?
> >>>
> >>> If so, what do I need to be doing to get that to happen?
> >>>
> >>> I've googled this to death and not encountered this precise problem.
> >>>
> >>> TIA
> >>> Guy
> >>>
> >>>
> >>> _______________________________________________
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> >
> >--
> >Moore's Law of Mad Science: Every eighteen months, the minimum IQ
> >necessary to destroy the world drops by one point.
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