die "can't map fault to serial!" unless $last_serial;
warn "ERROR: got Fault and ingoring $last_ip $last_serial\n";
$cpe_faulty->{$last_serial}++;
die "can't map fault to serial!" unless $last_serial;
warn "ERROR: got Fault and ingoring $last_ip $last_serial\n";
$cpe_faulty->{$last_serial}++;