Hi, I'm using a bridge between two interface (usb0 and eth1) to connect a development board to my pc. On the board there's a usb ethernet gadget because there's no eth interface. The communication seems to work but the problem is that I see arp request from the board and no arp reply. To add a bridge I'm using this commands: brctl addbr br0 brctl addif br0 eth0 brctl addif br0 usb0 brctl setfd br0 0 ifconfig br0 192.168.0.2 promisc ifconfig br0 up I tried even to set promiscous mode for eth1 and usb0 but nothing. Firewall is down both on by my pc and on the board. In the board I'm using kernel 2.6.34 and for my pc 2.6.31.12. Is there a way to populate the arp cache with a parameter or to modify the kernel to add the mac address in hard coded way? (I know it's bad but only to see if I can do the next steps). Please help me!! Marco