diff --git a/pkg/apihelper/reflect.go b/pkg/apihelper/reflect.go
index 10e3cd7013..3c80a67b16 100644
--- a/pkg/apihelper/reflect.go
+++ b/pkg/apihelper/reflect.go
@@ -57,50 +57,11 @@ func GetModels(opts *GetModelsOptions) error {
 		tstr := timeutils.MysqlTime(time)
 		return fmt.Sprintf("updated_at.ge('%s')", tstr)
 	}
-	setNextListParams := func(params *jsonutils.JSONDict, lastUpdatedAt time.Time, lastResult *printutils.ListResult) (time.Time, error) {
+	setNextListParams := func(params *jsonutils.JSONDict, lastResult *printutils.ListResult) error {
 		// NOTE: the updated_at field has second-level resolution.
 		// If they all have the same date...
-		var max time.Time
-		nmax := 0
-		n := len(lastResult.Data)
-
-		// find out the max updated_at date in the result set, and how
-		// many in the set has this date
-		for i := n - 1; i >= 0; i-- {
-			j := lastResult.Data[i]
-			updatedAt, err := j.GetTime("updated_at")
-			if err != nil {
-				log.Warningf("%s: updated_at field: %s, %s",
-					manKeyPlural, err, j.String())
-				continue
-			}
-			if max.IsZero() {
-				max = updatedAt
-			}
-			if max.Equal(updatedAt) {
-				nmax += 1
-			}
-		}
-		// error if we do not have valid date
-		if max.IsZero() {
-			return time.Time{}, fmt.Errorf("%s: cannot find next updated_at after '%q'",
-				manKeyPlural, lastUpdatedAt)
-		}
-
-		var newTime time.Time
-		var newOffset int
-		// if not all updated_at date are the same, then we can
-		// continue to the next age.
-		if nmax < n || (!max.Equal(lastUpdatedAt) && !max.Equal(PseudoZeroTime)) {
-			newTime = max
-			newOffset = nmax
-		} else {
-			newTime = lastUpdatedAt
-			newOffset = lastResult.Offset + n
-		}
-		params.Set("filter.0", jsonutils.NewString(minUpdatedAtFilter(newTime)))
-		params.Set("offset", jsonutils.NewInt(int64(newOffset)))
-		return newTime, nil
+		params.Set("offset", jsonutils.NewInt(int64(lastResult.Offset+len(lastResult.Data))))
+		return nil
 	}
 
 	listOptions := options.BaseListOptions{
@@ -112,7 +73,7 @@ func GetModels(opts *GetModelsOptions) error {
 		Filter: []string{
 			minUpdatedAtFilter(minUpdatedAt), // order matters, filter.0
 		},
-		OrderBy: []string{"updated_at"},
+		OrderBy: []string{"updated_at", "created_at", "id"},
 		Order:   "asc",
 		Limit:   options.Int(opts.BatchListSize),
 		Offset:  options.Int(0),
@@ -161,7 +122,7 @@ func GetModels(opts *GetModelsOptions) error {
 		if listResult.Offset+len(listResult.Data) >= listResult.Total {
 			break
 		}
-		minUpdatedAt, err = setNextListParams(params, minUpdatedAt, listResult)
+		err = setNextListParams(params, listResult)
 		if err != nil {
 			return fmt.Errorf("%s: %s", manKeyPlural, err)
 		}
diff --git a/pkg/vpcagent/ovn/keeper.go b/pkg/vpcagent/ovn/keeper.go
index 242498209c..c5be675cb3 100644
--- a/pkg/vpcagent/ovn/keeper.go
+++ b/pkg/vpcagent/ovn/keeper.go
@@ -26,6 +26,7 @@ import (
 	"yunion.io/x/ovsdb/types"
 	"yunion.io/x/pkg/errors"
 	"yunion.io/x/pkg/util/netutils"
+	"yunion.io/x/pkg/util/regutils"
 	"yunion.io/x/pkg/utils"
 
 	apis "yunion.io/x/onecloud/pkg/apis/compute"
@@ -436,6 +437,21 @@ func (keeper *OVNNorthboundKeeper) ClaimVpcEipgw(ctx context.Context, vpc *agent
 	return keeper.cli.Must(ctx, "ClaimVpcEipgw", args)
 }
 
+func formatNtpServers(srvs string) string {
+	srv := make([]string, 0)
+	for _, part := range strings.Split(srvs, ",") {
+		part = strings.TrimSpace(part)
+		if len(part) > 0 {
+			if regutils.MatchIPAddr(part) {
+				srv = append(srv, part)
+			} else {
+				srv = append(srv, "\""+part+"\"")
+			}
+		}
+	}
+	return strings.Join(srv, ",")
+}
+
 func generateDhcpOptions(ctx context.Context, guestnetwork *agentmodels.Guestnetwork, opts *options.Options) *ovn_nb.DHCPOptions {
 	var (
 		network = guestnetwork.Network
@@ -527,7 +543,7 @@ func generateDhcpOptions(ctx context.Context, guestnetwork *agentmodels.Guestnet
 		}
 		if len(ntpSrvs) > 0 {
 			// bug on OVN, should not use ntp server: QiuJian
-			// dhcpopts.Options["ntp_server"] = "{" + ntpSrvs + "}"
+			dhcpopts.Options["ntp_server"] = "{" + formatNtpServers(ntpSrvs) + "}"
 		}
 	}
 	return dhcpopts
@@ -964,7 +980,7 @@ func (keeper *OVNNorthboundKeeper) ClaimVpcGuestDnsRecords(ctx context.Context,
 		for _, guestnetwork := range network.Guestnetworks {
 			if guest := guestnetwork.Guest; guest != nil {
 				var (
-					name = guest.Name
+					name = guest.Hostname
 					ip   = guestnetwork.IpAddr
 				)
 				grs[name] = append(grs[name], ip)