[Dnsmasq-discuss] DHCP for multiple IP ranges with dnsmasq

[Simon Kelley]

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On 14/01/15 22:19, Helmut Friederici wrote:
> Hello Simon,
> 
> thanks for your reply.
> 
> Obviously the problems have gone two days later without having done
>  something. Maybe the lease times where too long and I was too 
> impatient.
> 

Could be. There's no way for dnsmasq to end existing leases, but it
will notice that a client should move IP because the config has
changed and refuse to renew when the client tries at the end of the
lease. That will make the client get a new lease with a new address.


Cheers,

Simon.

> I reduced the lease times to only a few minutes but later I will
> set them to some more practical values again.
> 
> But for now time healed any wounds.
> 
> Thanks again, Helmut
> 
> 
> Am Montag, 12. Januar 2015, 20:32:39 schrieb Simon Kelley:
>> A couple of things to start with:
>> 
>> First, tell us the version of dnsmasq you're using. Second, add
>> 
>> log-dhcp
>> 
>> to the configuration file, let you clients attempt to get an
>> address, and see what was logged. Amongst other things, all the
>> tags that dnsmasq calculated for the client will be shown, so we
>> can see if the problem is wrong tags, or something else.
>> 
>> 
>> Cheers,
>> 
>> Simon.
>> 
>> On 12/01/15 15:06, Helmut Friederici wrote:
>>> Hello, this is my first post in this mailing list and I am a
>>> newbie to dnsmasq. So please be a bit patient with me.
>>> 
>>> I think I am not the first having the following problem and
>>> there is a solution, but I haven't seen it yet. I want to setup
>>> multiple IP ranges for different ethernet-enabled devices. Many
>>> of them should get fixed addresses by dnsmasq, others should
>>> get real dynamic addresses. What I want is the following:
>>> 
>>> - defining several DHCP-Ranges with and without tagnames,
>>> e.g.: DHCP-RANGE=tag:external,<IP-Start>,<IP-
>>> End>,255.255.255.0,8h DHCP-RANGE=tag:local1,<IP-Start>,<IP-
>>> End>,255.255.255.0,1h DHCP-RANGE=tag:local2,<IP-Start>,<IP-
>>> End>,255.255.255.0,1h DHCP-RANGE=tag:local3,<IP-Start>,<IP-
>>> End>,255.255.255.0,1h 
>>> DHCP-RANGE=<IP-Start>,<IP-End>,255.255.255.0,2h - defining
> several
>>> DHCP-Hosts with and without fixed IPs, names, but all existing 
>>> range tags DHCP-HOST=<MAC1>,set:external,<Name1> 
>>> DHCP-HOST=<MAC2>,set:external,<IP2>,<Name2> 
>>> DHCP-HOST=<MAC3>,set:local1,<IP3> 
>>> DHCP-HOST=<MAC4>,set:local1,<IP4> 
>>> DHCP-HOST=<MAC5>,set:local2,<IP5>,<Name5> 
>>> DHCP-HOST=<MAC6>,set:local3,<IP6> - using partly specified MAC 
>>> addresses (vendor specific) so that devices with matching MAC 
>>> addresses get IP addresses of DHCP range "local2" 
>>> DHCP-HOST=11:22:33:*:*:*,set:local2 - using different gateways
>>> - or more specific suppress internet access 
>>> DHCP-OPTION=tag:local1,3,127.0.0.1 
>>> DHCP-OPTION=tag:local2,3,127.0.0.1 
>>> DHCP-OPTION=tag:local3,3,127.0.0.1 DHCP-OPTION=3,<Gateway-
> IP>
>>> 
>>> What I expected I expected the host with <MAC1> will get an IP
>>> from the range tagged as "external", but it gets one of the
>>> untagged range. Other PCs previously having an IP in the local1
>>> range but reconfigured to get an external one remain on the
>>> earlier address and do not have access to the internet any
>>> more. Dnsmasq runs on Red Hat Enterprise Linux 6.6, After
>>> modifying the config file I stopped the network and dnsmasq
>>> services, cleared the arp cache
> and
>>> restarted the services as follows, but the problem remains.
>>> service network stop service dnsmasq stop ip neigh flush dev
>>> eth1 service dnsmasq start service network start
>>> 
>>> Who can give me some advice? Or tell me where I'an wrong.
>>> 
>>> Thanks in advance
>>> 
>>> I tried to stop the network service and the dnsmasq service,
>>> mod
>>> 
>>> 
>>> 
>>> _______________________________________________
> Dnsmasq-discuss
>>> mailing list Dnsmasq-discuss at lists.thekelleys.org.uk 
>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>
>>
>>> 
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> 
> 
> 
> 
> _______________________________________________ Dnsmasq-discuss
> mailing list Dnsmasq-discuss at lists.thekelleys.org.uk 
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
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