diff --git a/easytier/src/dns/client.rs b/easytier/src/dns/client.rs
index a19efae9..448ed8c8 100644
--- a/easytier/src/dns/client.rs
+++ b/easytier/src/dns/client.rs
@@ -1,65 +1,17 @@
 use super::config::DNS_SERVER_RPC_ADDR;
-use crate::dns::peer_mgr::{DnsPeerMgr, DnsSnapshot};
+use crate::dns::peer_mgr::DnsPeerMgr;
 use crate::peers::peer_manager::PeerManager;
 use crate::proto::dns::{DnsPeerManagerRpcServer, DnsServerRpcClientFactory, HeartbeatRequest};
 use crate::proto::peer_rpc::RoutePeerInfo;
 use crate::proto::rpc_impl::standalone::StandAloneClient;
 use crate::proto::rpc_types::controller::BaseController;
 use crate::tunnel::tcp::TcpTunnelConnector;
-use crate::utils::DeterministicDigest;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::time::Duration;
 use tokio::task::JoinSet;
 use uuid::Uuid;
 
-#[derive(Debug, Clone, Default)]
-pub struct Heartbeat {
-    pub(super) id: Uuid,
-    pub(super) digest: Vec<u8>,
-    pub(super) snapshot: Option<DnsSnapshot>,
-}
-
-impl Heartbeat {
-    pub fn new(id: Uuid) -> Self {
-        Self {
-            id,
-
-            ..Default::default()
-        }
-    }
-
-    pub fn update(&mut self, snapshot: DnsSnapshot) {
-        self.digest = snapshot.digest();
-        self.snapshot = Some(snapshot);
-    }
-}
-
-impl From<Heartbeat> for HeartbeatRequest {
-    fn from(value: Heartbeat) -> Self {
-        Self {
-            id: Some(value.id.into()),
-            digest: value.digest,
-            snapshot: value.snapshot.map(Into::into),
-        }
-    }
-}
-
-impl TryFrom<HeartbeatRequest> for Heartbeat {
-    type Error = anyhow::Error;
-
-    fn try_from(value: HeartbeatRequest) -> Result<Self, Self::Error> {
-        Ok(Self {
-            id: value
-                .id
-                .ok_or(anyhow::anyhow!("missing id in heartbeat"))?
-                .into(),
-            digest: value.digest,
-            snapshot: value.snapshot.map(TryInto::try_into).transpose()?,
-        })
-    }
-}
-
 #[derive(Debug)]
 pub struct DnsClient {
     mgr: Arc<DnsPeerMgr>,
@@ -91,7 +43,11 @@ impl DnsClient {
 
     pub async fn run(&self) {
         let mut rpc = StandAloneClient::new(TcpTunnelConnector::new(DNS_SERVER_RPC_ADDR.clone()));
-        let mut heartbeat = Heartbeat::new(self.id());
+        let mut heartbeat = HeartbeatRequest {
+            id: Some(self.id().into()),
+
+            ..Default::default()
+        };
         loop {
             if let Err(e) = self.heartbeat(&mut rpc, &mut heartbeat).await {
                 tracing::error!("DnsClient heartbeat failed: {:?}", e);
@@ -103,7 +59,7 @@ impl DnsClient {
     async fn heartbeat(
         &self,
         rpc: &mut StandAloneClient<TcpTunnelConnector>,
-        heartbeat: &mut Heartbeat,
+        heartbeat: &mut HeartbeatRequest,
     ) -> anyhow::Result<()> {
         let request =
             if heartbeat.snapshot.is_none() || self.mgr.dirty.swap(false, Ordering::Release) {