On 21.02.2018 14:39, Steinberg Michael wrote:
seemingly the udp_input code is serving UDP broadcasts originating from a 
certain netif to UDP sockets/pcbs bound to the correct port on a different 
netif.

I'm not aware of that, could you file a bug until this is sorted out?
Patching udp.c:255 following to:

#endif /* SO_REUSE */
           ) && (inp->ip_addr.addr == pcb->local_ip.addr)) {
         /* the first unconnected matching PCB */
         uncon_pcb = pcb;

seems like a working short term fix.

That seems to prevent pcbs with a local IP of 'any' from receiving such packets.

Simon

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