[uml-devel] Test for ethernet broadcast address?

[Rob Landley <rob@landley.net>]

So I'm trying to play with ifenslave under UML, and my naieve attempt to go

./linux LD_ASSUME_KERNEL=2.4.1 eth0=daemon,11:11:11:11:11:11 \ 
eth1=daemon,22:22:22:22:22:22 rootfstype=hostfs rw init=/bin/sh

Led to unexpected results that eth0 had a mac addr of 00:00:00:00:00:00.  
Eventually, I tracked it down to this test in arch/um/drivers/net_kern.c:
if(addr[0] & 1){
        printk(KERN_ERR
               "Attempt to assign a broadcast ethernet address to a "
               "device disallowed\n");
        return(0);
}

My question is: where's the spec for what is and isn't a broadcast address?

RFC 894 says that "the" ethernet broadcast address is (only) FF:FF:FF:FF:FF:FF
http://www.freesoft.org/CIE/RFC/894/

So does Ethereal's wiki:
http://wiki.ethereal.com/Ethernet

Confused?

Rob


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