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 > 255.255.255.255 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 -- Roberto C. Sanchez http://familiasanchez.net/~roberto
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