[Dnsmasq-discuss] The simplest setup to preserve IPs

[Simon Kelley]

Michal Sawicz wrote:
> Hi, I'm trying to get dnsmasq to give IPs assigned in /etc/hosts based
> on hostname from the dhcp request, my config is as follows:
> 
> domain-needed
> bogus-priv
> filterwin2k
> listen-address=192.168.0.1
> bind-interfaces
> expand-hosts
> domain=sawicz.net
> dhcp-range=192.168.0.2,192.168.0.50,12h
> dhcp-option=42,0.0.0.0
> 
> Based on that setup I thought that all the machines reporting a known
> hostname in the dhcp request would get the IP assigned to it
> in /etc/hosts file regardless of their IP (and, ideally, of the IP being
> leased - so that I'd be able to use either of my network ifaces).
> 
> Unfortunately it doesn't work like that for all my hosts - it does for
> those that are windows based, and not for the others.
> 
> For the others it assigns an IP from the dhcp-range and complains about
> not being able to assign the hostname, because it's present
> in /etc/hosts and has different IP assigned.
> 
> Am I missing something?

The /etc/hosts entries will not, by themselves, be used to allocate 
fixed IP addresses to DHCP clients.

It's fine to put

1.2.3.4    somename

in /etc/hosts, and then just put

dhcp-host=somename

in /etc/dnsmasq.conf

_as_long_as_ a hostname has only one address in /etc/hosts.

I think you are implying that your DHCP clients can turn up on more than 
one network: If so, don't use /etc/hosts at all, and do

dhcp-host=somename,1.2.3.4
dhcp-host=somename,10.20.30.40

That gives dnsmasq the ability to pick the address on the correct 
subnet, and adjust the view in DNS accordingly.

HTH

Simon.



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