UDP broadcast

[Andrey V. Elsukov]

On 06.03.2019 01:46, Goran Mekić wrote:
> Hello,
> 
> I have a audio mixer which is controleable over network via android app.
> The discovery is done by sending broadcast UDP message "/info\0\0\0" to
> 255.255.255.255 (checked by tcpdump on the router). I thought I can do
> the same with:
> 
> printf "/info\0\0\0" | nc -4u -w 0 255.255.255.255 10024
> 
> But I never get the reply. This is what tcpdump sees:
> 
> tcpdump -nnSX -v 'src 192.168.5.80 or dst 255.255.255.255'
> tcpdump: listening on re0, link-type EN10MB (Ethernet), capture size

I think it is because netcat does not send real broadcast, you can add
-e flag to tcpdump and compare ethernet destination addresses.

-- 
WBR, Andrey V. Elsukov

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