[Dnsmasq-discuss] Tag from interface name?

[Simon Kelley]

On 04/07/17 09:06, Chris Novakovic wrote:
> On 03/07/2017 15:53, Brian Rak wrote:
>> I'd like to be able to classify DHCP requests based on the interface
>> they come in on.  I'd like to have a tag based on the interface name
>> (so, if the request came in over br0, I'd have a br0 tag to match on).
>>
>> Is there any way of accomplishing this with dnsmasq currently?  My
>> interfaces don't actually have an IP address assigned, so I can't match
>> by IP.
> 
> Dnsmasq provides this for you already --- it's just not mentioned in the
> man page for some reason.
> 

You just have to look harder :)

"The  tag  system  works as follows: For each DHCP request, dnsmasq col‐
 lects a set of valid tags from active configuration lines which include
 set:<tag>,  including  one  from  the  dhcp-range  used to allocate the
 address, one from any matching dhcp-host (and "known"  if  a  dhcp-host
 matches)  The  tag  "bootp"  is set for BOOTP requests, and a tag whose
 name is the name of the interface on which the request arrived is  also
 set."


Cheers,

Simon.

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