[Dnsmasq-discuss] DNS cache for DHCP addresses

[Simon Kelley]

Pat wrote:
> Hi,
> 
> Great work on dnsmasq, btw. Is it possible to get it to check the DHCP 
> clients' IPs when asked for a DNS lookup before passing it upstream? For 
> example, if I have DHCP clients 'lister' and 'rimmer' connected to server 
> 'kryten', if I run "host lister" on 'rimmer' at the moment I get an NXDOMAIN, 
> whereas I'd like to get lister's IP.
> 
> If it's not possible to do this at the moment, I'll have a look at the source 
> and see if I can set up a method.
> 

That's pretty much the whole point of integrating the DHCP and DNS 
servers! You need to tell the DHCP system what the names of the hosts 
are; broadly there are two alternative ways to do this.

1) Have the DHCP client send the hostname when it gets a lease. This 
happpens automatically on Windows and Mac clients. Different Linux 
clients need different configuration options, so you need to check the 
documenation.

2) Associate a hostname with a MAC address in the dnsmasq configuration. 
The easiest way to do that is to set "read-ethers" in /etc/dnsmasq.conf 
   and put the mac-address/hostname pairs in /etc/ethers.

It's worth checking the FAQ too.


Cheers,

Simon.