- my $mac = '';
- for (my $i = 0; $i < 6; $i++) {
- my $ss = hex(substr($rand, $i*2, 2));
- if (!$i) {
- $ss &= 0xfe; # clear multicast
- $ss |= 2; # set local id
- }
- $ss = sprintf("%02X", $ss);
-
- if (!$i) {
- $mac .= "$ss";
- } else {
- $mac .= ":$ss";
- }
- }
+ # clear multicast, set local id
+ vec($rand, 0, 8) = (vec($rand, 0, 8) & 0xfe) | 2;