[ cc'ed Ido ] On 8/22/25 1:16 PM, Ben Greear wrote: > Hello, > > Assume I have a network interface assigned to a VRF (wifi AP interface > is what I'm testing now). > I would like to have it be able to send and receive UDP broadcast > frames. I am binding the socket > to the AP netdev with SO_BINDTODEVICE. From what I can tell, the socket > at least cannot receive > UDP broadcasts sent to it. I do see the broadcast arriving on the AP > interface if I run tshark. > > Is there any particular issue with UDP broadcast sockets in VRF? Do I > have to instead > bind to the vrf netdev instead of the ap netdev? I am not aware of any issues with VRF and broadcast, but the fcnal-test suite (covers permutations across the uapi) is lacking broadcast tests. As I recall you tend to run relatively new kernels, so either device should work. I use the fib:* tracepoints as a start point for debugging cases like this. > > And always possible I doing something wrong in my socket code, my > current test setup > is quite complicated. > > Thanks, > Ben >
