if ((ND.flags & ND6_IFF_INSECURE) != 0)
printf("INSECURE ");
if ((ND.flags & ND6_IFF_PERFORMNUD) != 0)
printf("PERFORMNUD ");
if ((ND.flags & ND6_IFF_PROXY_PREFIXES) != 0)
printf("PROXY_PREFIXES ");
if ((ND.flags & ND6_IFF_INSECURE) != 0)
printf("INSECURE ");
if ((ND.flags & ND6_IFF_PERFORMNUD) != 0)
printf("PERFORMNUD ");
if ((ND.flags & ND6_IFF_PROXY_PREFIXES) != 0)
printf("PROXY_PREFIXES ");