[Dnsmasq-discuss] 2.53rc2

[Simon Kelley]

richardvoigt at gmail.com wrote:
>> Binding 192.168.3.1:67 means that packets from unconfigured hosts which
>> are sent to 255.255.255.255:67 have problems on some platforms.
>>
>> If you set --bind-interfaces then dnsmasq will set the SO_REUSEADDR flag
>> on that socket, which allows you to run a relay which also listens on
>> *:67, as long as it also sets that flag.
>>
>> On my list is to add a command-line option to dhcp-helper to do exactly
>> that.
> 
> IIRC if you use SO_REUSEADDR to bind two sockets to the same address,
> it is undefined which of them receives incoming datagrams.  It's
> possible that some are delivered to one and some to another, and there
> may even be operating systems that deliver to all bound sockets, but
> relying on the behavior would be non-portable.
> 

Interesting: do you have any references on that?

Cheers,

Simon.