Re: When does Linux drop UDP packets?

[david@lang.hm]

On Thu, 4 Jun 2009, Alexander Clouter wrote:

> Philipp Reh <sefi@s-e-f-i.de> wrote:
>>
>> I have the following setting in which a client that resides on the same
>> physical network as a server wants to receive any UDP packet that
>> arrives on any of its interfaces sent by that server.
>>
> Read up about multicasting, it will do what you want, does not depend on
> the IP address of the destination workstation and will also cross
> subnets if you want it to.
>
> It's dead easy to transmit and receive multicast traffic, broadcasting
> network traffic is so 1980's :)

there is only a difference between multicast and broadcast traffic if you 
are spanning subnets.

but the issue here is the rp_filter, and that would also filter out 
multicast packets from sources that you don't have routes to.

David Lang