[Dnsmasq-discuss] Multiple MACs and single IP

[Simon Kelley]

David Kovalsky wrote:
> Hi, 
> 
> I'd like to suggest a feature to dnsmasq for the DHCP functionality.
> The ability to have same IP address for multiple MAC addresses. 
> 
> My goal is to be able to have same IP for both my wifi and wired
> connection so I can switch back and forth without losing connections. 
> My setup and more info is described in the openwrt bug tracker:
> https://dev.openwrt.org/ticket/6205
> 
> Does this sound interesting to others? 
> 


It's already supported. The crucial thing to understand is that if 
dnsmasq leases an IP address to MAC-address-1, it can't normally break 
that promise and lease it to MAC-address-2 whilst the lease is valid. 
Hence when MAC-address-2 turns up, it gets a pool address instead.

You can explicitly give dnsmasq permission to break the promise by 
putting both addresses in the _same_ dhcp-host line:

dhcp-host=<MAC-address-1>,<MAC-address-2>,<IP-address>

You probably need to go back to oprnwrt and get them to enhance the GUI 
system to support this.

HTH

Simon.