I have a network with 6 W5100s set as follows:
netmask for everything is 255.255.255.0
10.0.1.21, sends packets to
10.0.2.21, sends packets to
These should be two independent IP subnets, though they share the same physical ethernet.
However, if 10.0.1.21 sends a broadcast to 10.0.1.255, it is received not only by 10.0.1.101 and 102,
but also by 10.0.2.21 ! (I have not checked on 103 and 104).
Is this a bug or does someone know why this is not being filtered out by the netmask on 10.0.2.21?