[Dnsmasq-discuss] Cannot send dhcp option 12 hostname to clients

[Daryl Richards]

On 2019-05-14 12:42 p.m., Kevin Flynn wrote:
> 
> Hello everyone.
> 
> I'm currently working on a small home network voip system, and I cannot 
> for the life of me figure out how to get dnsmasq to send dhcp option 12 
> hostnames to clients. I've tried all the obvious methods, including 
> /etc/ethers, dhcp-hostsfile entries, dhcp-ignore-names, 
> dhcp-generate-names, tag sets, etc. with no luck.
> 
> As I was searching the list archices, I noticed a comment from Simon 
> mentioning that dnsmasq will not send a dhcp option 12 hostname to a 
> client if the client sends a hostname to dnsmasq, and none of my 
> configuration attempts seem to be able to override this behavior.
> 
> The reason for attempting this, is that I have 2 voip ata adapters, 
> which are Linksys/Cisco SPA3000 and they are configured by default to 
> send the hostname "SipuraSPA." and I am attempting to configure and 
> provision these devices automatically, as opposed to logging into each 
> device individually everytime they need to be configured.
> 
> So in summary, is there any way to tell dnsmasq to send a dhcp option 12 
> hostname to a client reliably, everytime, regardless of what the client 
> is sending ?
I've never seen this work... What I do in provisioning phones, is set 
the hostname of the device in the config file sent.. In the case of 
Sipura devices...

<flat-profile>
	<... other config items ...>
         <HostName>ext-xxx</HostName>
</flat-profile>

Then, the phone will send that hostname in it's DHCP request, which then 
you can use for DNS lookups.

-- 
Daryl Richards
Isle Technical Services Inc