[Dnsmasq-discuss] Sometimes forgets to hand out known dhcp-host IP

[hansen]

On Fri, Mar 8, 2013 at 6:14 PM, Simon Kelley <simon at thekelleys.org.uk>wrote:

> On 07/03/13 14:34, hansen wrote:
>
>> Hi dnsmasq'ueraders :)
>>
>> I have a small network, where I am trying to split my network into to
>> ranges.
>> One range for local machines and another range for guests. On two
>> different interfaces connected to dnsmasq.
>>
>> Usually I don't have any problems, but sometimes my local machines end
>> up on the guest range network.
>> If I release the DHCP on the machine and reboot it, then it is 50/50 if
>> the go back to local network or end up on guest network again.
>>
>> Is this network setup just bad and not possible to behave as I expect -
>> or is it just a configuration mistake?
>> I am running dnsmasq 2.65 on FreeBSD 7.4.
>> Looking at the changelog it seems like the feature I'm looking for was
>> removed in 2.63 (Remove the interface:<interface> argument in
>> --dhcp-range)
>>
> No that feature won't fix the problem.
>
> The problem is that you have two interfaces (em1 and em2) connected to the
> same broadcast domain. That's not something that dnsmasq knows how to deal
> with, and it gets confused when is gives a client an address associated
> with one interface, and then it turns up on a different interface.
>
> Can you use one physical interface on the machine running dnsmasq, and
> give it two addresses?
>

Hi Simon,

Thanks for replying. I do think it's possible to create virtual IPs on one
physical interface. So you don't think it would be a problem if two VIPs
broadcasts?

Not sure how the ideal setup would be, but probably something with VLAN -
the switch doesn't do that and don't have the funds right now.

-hansen
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/attachments/20130311/66d7ccf5/attachment.html>