On 26/09/18 17:33, Simon Kelley wrote:
> On 24/09/18 11:45, gravit...@gmx.com wrote:
>>
>> Amof, the first and only frames my dongle sends on eth at start, are
>> some Dhcp DISCOVER, no arps at all.
>> Please note that such Dhcp DISCOVER frames come with the broadcast bit
>> NOT set.
>> Afaik, that meas my dongle is indeed asking the Dhcp server to send a
>> unicast response, directly to its mac.
>> Instead QNSMASQ sends those Dhcp OFFER frames to broadcast.
>> Why it happens so?
>>  
> 
> I can offer two reasons why it might be so. The first is that there's a
> bug in dnsmasq, which is not unheard-of, but this is old code and a bug
> has not been observed before. The second is that you're running dnsmasq
> configured to always send broadcasts, using the --dhcp-broadcast option.
> 
> Check all the dnsmasq configuration files, that's the sort of thing that
> gets slipped in because is solves someone's problem one time, and "it
> can't do any harm".
> 
> 

Looking at the code, it also falls back to broadcast if the "hardware
address length field is zero or greater than 16, or if the "hardware
address type" field is zero.


Cheers,

Simon.


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