Sebastien, check out the snull network driver from the "Linux Device Drivers" book. it has a short explanation on how to "trick" the kernel into sending the packet even though the destination is on the local machine: http://www.linuxdriver.co.il/ldd3/chp-17-sect-1.shtml dave aka prpplague --- On Sun, 7/27/08, Sebastien Fauris <titelive72@xxxxxxxxx> wrote: > From: Sebastien Fauris <titelive72@xxxxxxxxx> > Subject: testing ethernet device with external loopback > To: linux-embedded@xxxxxxxxxxxxxxx > Date: Sunday, July 27, 2008, 3:47 AM > Hi, > > for hardware testing purposes, I would like to perform an > external > loopback on my ethernet interface. For this, I wrote 2 > little > executables, one sending a raw ethernet packet (using > 'sendto') on a > socket opened with the parameters PF_PACKET, SOCK_RAW, > htons(ETH_P_ALL), the other one doing a recvfrom from a raw > socket. > The problem is that on the reception side, I always receive > what I send, > even when > the external RJ45 stub is not plugged ! > Is there a way to tell to the kernel on the reception side > that I want > to get only packets coming from the external world ? > > Thanks, > > Sebastien. > > -- > To unsubscribe from this list: send the line > "unsubscribe linux-embedded" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at > http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
