# Lookup ipaddress from database, if possible.
$u->push_value ('params.MS_TCPIP.eth0', 'IPAddress',
    sub {
        foreach my $lookup ($u->{'_meta'}->{'macaddr'},
                            $u->{'UserData'}->{'ComputerName'},
                            'Default') {
            my $value = CONFIG->lookup_value($lookup, 'IPAddress');
            defined $value
                and return $value;
        }
        return undef;
    });