Fix DNS reject response

route/route_dns.go

@@ -161,7 +161,14 @@ func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, er
 				case *R.RuleActionReject:
 					switch action.Method {
 					case C.RuleActionRejectMethodDefault:
-						return dns.FixedResponse(message.Id, message.Question[0], nil, 0), nil
+						return &mDNS.Msg{
+							MsgHdr: mDNS.MsgHdr{
+								Id:       message.Id,
+								Rcode:    mDNS.RcodeRefused,
+								Response: true,
+							},
+							Question: []mDNS.Question{message.Question[0]},
+						}, nil
 					case C.RuleActionRejectMethodDrop:
 						return nil, tun.ErrDrop
 					}