What is the correct behavior ipv4/ipv6

[Rao Shoaib]

I am looking at a system which is configured for IPv6 only but sits in a 
network that serves both IPv4 and IPv6. When an IPv4 packet with a 
destination  broadcast address is sent out (in this case DHCP) the 
system accepts it and since it does not have any route to the sender it 
prints the Martian message.

Sure, we can turn off the Martian message and maybe the system should be 
in an IPv6 only network.

The question that is being asked is that why is the system accepting an 
IPv4 broadcast packet in the first place ?  Is this behavior incorrect 
and should I submit a patch ?

Thanks,

Shoaib