if ($result = openvpn_validate_cidr($pconfig['tunnel_networkv6'], 'IPv6 Tunnel Network', false, "ipv6")) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['remote_network'], 'IPv4 Remote Network', true, "ipv4")) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['remote_networkv6'], 'IPv6 Remote Network', true, "ipv6")) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['local_network'], 'IPv4 Local Network', true, "ipv4")) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_cidr($pconfig['local_networkv6'], 'IPv6 Local Network', true, "ipv6")) {
     $input_errors[] = $result;
 }
 $portused = openvpn_port_used($pconfig['protocol'], $pconfig['interface'], $pconfig['local_port'], $vpnid);
 if ($portused != $vpnid && $portused != 0) {
     $input_errors[] = gettext("The specified 'Local port' is in use. Please select another value");
 }
 if (!$tls_mode && empty($pconfig['autokey_enable'])) {
     if (!strstr($pconfig['shared_key'], "-----BEGIN OpenVPN Static key V1-----") || !strstr($pconfig['shared_key'], "-----END OpenVPN Static key V1-----")) {
         $input_errors[] = gettext("The field 'Shared Key' does not appear to be valid");
     }
 }
 if ($tls_mode && !empty($pconfig['tlsauth_enable']) && empty($pconfig['autotls_enable'])) {
     if (!strstr($pconfig['tls'], "-----BEGIN OpenVPN Static key V1-----") || !strstr($pconfig['tls'], "-----END OpenVPN Static key V1-----")) {
         $input_errors[] = gettext("The field 'TLS Authentication Key' does not appear to be valid");
     }
 }
 if (!empty($pconfig['dns_server1']) && !is_ipaddr(trim($pconfig['dns_server1']))) {
     $input_errors[] = gettext("The field 'DNS Server #1' must contain a valid IP address");

 if (isset($id) && $a_client[$id]) {
     $vpnid = $a_client[$id]['vpnid'];
 } else {
     $vpnid = 0;
 }
 if ($pconfig['mode'] != "p2p_shared_key") {
     $tls_mode = true;
 } else {
     $tls_mode = false;
 }
 /* input validation */
 if ($pconfig['local_port']) {
     if ($result = openvpn_validate_port($pconfig['local_port'], 'Local port')) {
         $input_errors[] = $result;
     }
     $portused = openvpn_port_used($pconfig['protocol'], $pconfig['local_port']);
     if ($portused != $vpnid && $portused != 0) {
         $input_errors[] = gettext("The specified 'Local port' is in use. Please select another value");
     }
 }
 if ($result = openvpn_validate_host($pconfig['server_addr'], 'Server host or address')) {
     $input_errors[] = $result;
 }
 if ($result = openvpn_validate_port($pconfig['server_port'], 'Server port')) {
     $input_errors[] = $result;
 }
 if ($pconfig['proxy_addr']) {
     if ($result = openvpn_validate_host($pconfig['proxy_addr'], 'Proxy host or address')) {
         $input_errors[] = $result;
     }
     if ($result = openvpn_validate_port($pconfig['proxy_port'], 'Proxy port')) {