linux-kernel - Re: When does Linux drop UDP packets?

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Message-ID: <alpine.DEB.1.10.0906041618200.7953@asgard>
Date:	Thu, 4 Jun 2009 16:19:56 -0700 (PDT)
From:	david@...g.hm
To:	Alexander Clouter <alex@...riz.org.uk>
cc:	linux-kernel@...r.kernel.org
Subject: Re: When does Linux drop UDP packets?

On Thu, 4 Jun 2009, Alexander Clouter wrote:

> Philipp Reh <sefi@...-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

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