Destination Host Unreachable for icmp_seq=0

 79 cnopen(dev, flag, mode, p)
 80         dev_t dev;
 81         int flag, mode;
 82         struct proc *p;
 83 {
 84         const struct cdevsw *cdev;
 85         dev_t cndev;
 86 
 87         if (cn_tab == NULL)
 88                 return (0);
 89 
 90         /*
 91          * always open the 'real' console device, so we don't get nailed
 92          * later.  This follows normal device semantics; they always get
 93          * open() calls.
 94          */
 95         cndev = cn_tab->cn_dev;
 96         if (cndev == NODEV) {
 97                 /*
 98                  * This is most likely an error in the console attach
 99                  * code. Panicing looks better than jumping into nowhere
100                  * through cdevsw below....
101                  */
102                 panic("cnopen: no console device");
103         }

＠ cn_tab:

arch/macppc/dev/z8530tty.c:             cn_tab->cn_dev = dev;
arch/macppc/macppc/machdep.c:           cn_tab = cp;
arch/macppc/macppc/machdep.c:           cn_tab = cp;

＠ macppc/macppc/mach_dep.c:

    451 #if NITE > 0
    452         if (strcmp(type, "display") == 0) {
    453                 extern struct consdev consdev_ite;
    454
    455                 cp = &consdev_ite;
    456                 (*cp->cn_probe)(cp);
    457                 (*cp->cn_init)(cp);
    458                 cn_tab = cp;
    459
    460                 return;
    461         }
    462 #endif