diff options
| -rwxr-xr-x | scripts/system/vyatta_interface_rescan | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/scripts/system/vyatta_interface_rescan b/scripts/system/vyatta_interface_rescan index bdc8fd67..a33f8ee9 100755 --- a/scripts/system/vyatta_interface_rescan +++ b/scripts/system/vyatta_interface_rescan @@ -45,11 +45,15 @@ my %whitelist = ( sub persistent_address { my $mac = shift; - # is local assignment bit (IEEE802) not set? - return 1 unless ($mac =~ /^.[2367abef]:/); + return if ($mac eq '00:00:00:00:00:00'); # zero address is reserved - # is address bogus? - return if ($mac eq '00:00:00:00:00:00'); + # get first octet + return unless ($mac =~ /^([0-9a-f][0-9a-f]):/); + my $oct0 = hex($1); + + return if ($oct0 & 0x1); # skip it is a multicast address + + return 1 unless ($oct0 & 0x2); # this is good, not locally assigned # unless it is in whitelist, it is non persistent $mac =~ /^([0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f])/; |