if ($tag) {
system("/sbin/bridge vlan add dev $iface vid $tag pvid untagged") == 0 ||
die "unable to add vlan $tag to interface $iface\n";
+
+ warn "Caution: Setting VLAN ID 1 on a VLAN aware bridge may be dangerous\n" if $tag == 1;
} else {
system("/sbin/bridge vlan add dev $iface vid 2-4094") == 0 ||
die "unable to add default vlan tags to interface $iface\n" if !$trunks;