diff -Naur -X exclude-files ac_cum/arch/um/drivers/net_kern.c ac/arch/um/drivers/net_kern.c
--- ac_cum/arch/um/drivers/net_kern.c	Fri Jun  1 20:00:29 2001
+++ ac/arch/um/drivers/net_kern.c	Fri Jun  1 20:07:07 2001
@@ -363,6 +363,12 @@
 		}
 		str = end + 1;
 	}
+	if(addr[0] & 1){
+		printk(KERN_ERR 
+		       "Attempt to assign a broadcast ethernet address to a "
+		       "device disallowed\n");
+		return(-1);
+	}
 	return(0);
 }