[Dnsmasq-discuss] Disappearing hosts from local DNS resolution

[Rune Kock]

I think that I've been hit by this bug:
http://roy.marples.name/projects/dhcpcd/ticket/91

Whether that's the same as the one you found, I don't really know.

Simon, I'm going to open a serious bug on the Debian dhcpcd package
for this.  It seems that it is a really bad idea to use the unfixed
version.


Rune

On Tue, Oct 14, 2008 at 04:45, Eric Thibodeau <kyron at neuralbs.com> wrote:
> Rune Kock wrote:
>>
>> Do you have any more information about this dhcpcd problem?  In
>> particular, is it a bug that is present in version 3.2.3?
>>
>
> I couldn't say, the cluster was running net-misc/dhcpcd-3.0.13 and then
> jumped to net-misc/dhcpcd-4.0.0_rc4 (thank god for emerge.log)....
>>
>> TIA
>> Rune
>>
>>
>> On Thu, Oct 9, 2008 at 22:02, Eric Thibodeau <kyron at neuralbs.com> wrote:
>>
>>>
>>> Fixed, Roy noticed a discrepancy in the version of dhcpcd, I upgraded to
>>> 4.0.2 and now my hosts have a longer lifespan ;)
>>>
>>> Eric
>>>
>>> Simon Kelley wrote:
>>>
>>>>
>>>> Eric Thibodeau wrote:
>>>>
>>>>>
>>>>> Hello,
>>>>>
>>>>>  I am using dnsmasq as a core component of my cluster. I'm having a
>>>>> weird problem where the nodes are disappearing (can't use hostnames
>>>>> anymore). So I am forced to connect to them using the IP addr. and
>>>>> forcing
>>>>> dhcpcd to request an IP for the hosts to reappear in dnsmasq. The logs
>>>>> show
>>>>> the following on the disappeared hosts:
>>>>>
>>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPREQUEST(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPNAK(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44 lease not found
>>>>> ...
>>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPDISCOVER(eth1)
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPOFFER(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPDISCOVER(eth2)
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPOFFER(eth2) 10.0.1.11
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPREQUEST(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPACK(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44 thinkbig1
>>>>>
>>>>>  Here are two significant lines from my config file:
>>>>>
>>>>> dhcp-range=AthlonXP_1,10.0.1.10,10.0.1.126,255.255.255.0,12h
>>>>>
>>>>> dhcp-host=00:01:03:df:ca:44,net:AthlonXP_1,thinkbig1,10.0.1.11
>>>>>
>>>>> As you can note, I am defining a range with a lease time of 12h but
>>>>> none
>>>>> for the statically defined hosts. Could this be the reason the nodes
>>>>> disappear (lease time not sent to nodes if it's not defined in the
>>>>> static
>>>>> definition)?
>>>>>
>>>>
>>>> Not a problem, if the lease time is not given, it defaults to the value
>>>> for the range.
>>>>
>>>>>
>>>>> dnsmasq version is 2.45 and dhcpcd is 4.0.1-rc1
>>>>>
>>>>>
>>>>
>>>> The reaon the host is not in DNS is because there is no lease for it in
>>>> dnsmasq's lease database. The dhcp-host line tells dnsmasq what address
>>>> to
>>>> offer, but it's the existence of a lease that gets reflected into the
>>>> DNS,
>>>>
>>>> Something is mangling your lease database, hence when the host tries to
>>>> renew its lease:
>>>>
>>>>>
>>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPREQUEST(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44
>>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPNAK(eth1) 10.0.1.11
>>>>> 00:01:03:df:ca:44 lease not found
>>>>>
>>>>
>>>>                   ^^^^^^^^^^^^^^^
>>>>
>>>> Are you doing something odd with the leases file?
>>>>
>>>> Simon.
>>>>
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>>>>
>>>
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>
>