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Re: UDP Broadcast

Michael Wüst wrote:
> Hi @ all,
> I have the following problem:
> System is Debian Linux Sarge with Kernel 2.4.29. I want to
> send and receive UDP Broadcasts. I have no firewall
> installed, the system is very basic.
> The Broadcasts need to be received from systems not being
> in the same subnet and to be sent to systems not being in
> the same subnet.
> I am using sockets with SO_BROADCAST enabled. The packet
> is sent out and received, but only in the same subnet, not
> in other subnets being on the same physical network.
> What am I doing wrong? What is exactly the meaning of the
> broadcast value in /etc/network/interfaces? Are there any
> specific parameters to be set? Are there any special kernel
> issues that need recompiling? Is the broadcast adress
> correct?
> Maybe someone has any for functionality approved command
> line test program that sends out any "text" by UDP broadcast
> so that I can check whether the linux is blocking or my
> configuration is or my programing is wrong.

As a way to protect against problems with broadcast flooding, most
routers/switches/whatever will not rebroadcast from one subnet to
another.  If you think about it, it makes sense.


Roberto C. Sanchez

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