diff --git a/easytier/src/dns/node_mgr.rs b/easytier/src/dns/node_mgr.rs
index 09c2cc67..4b9eafe1 100644
--- a/easytier/src/dns/node_mgr.rs
+++ b/easytier/src/dns/node_mgr.rs
@@ -36,7 +36,7 @@ impl TryFrom<&DnsSnapshot> for DnsNodeInfo {
     }
 }
 
-const DNS_CLIENT_TTL: Duration = Duration::from_secs(5);
+const DNS_NODE_TTI: Duration = Duration::from_secs(5);
 
 #[derive(Debug, Default)]
 pub struct DnsNodeMgrDirtyFlags {
@@ -54,7 +54,7 @@ pub struct DnsNodeMgr {
 impl DnsNodeMgr {
     pub fn new() -> Self {
         Self {
-            nodes: Cache::builder().time_to_live(DNS_CLIENT_TTL).build(),
+            nodes: Cache::builder().time_to_idle(DNS_NODE_TTI).build(),
             dirty: Default::default(),
         }
     }
diff --git a/easytier/src/dns/peer_mgr.rs b/easytier/src/dns/peer_mgr.rs
index 05c8dc1b..5acd1e3a 100644
--- a/easytier/src/dns/peer_mgr.rs
+++ b/easytier/src/dns/peer_mgr.rs
@@ -39,7 +39,7 @@ impl TryFrom<DnsExportConfig> for DnsPeerInfo {
     }
 }
 
-const DNS_PEER_TTL: Duration = Duration::from_secs(3);
+const DNS_PEER_TTI: Duration = Duration::from_secs(3);
 
 #[derive(Debug)]
 pub struct DnsPeerMgrInner {
@@ -145,7 +145,7 @@ pub struct DnsPeerMgr(Arc<DnsPeerMgrInner>);
 impl DnsPeerMgr {
     pub fn new(peer_mgr: Arc<PeerManager>, global_ctx: ArcGlobalCtx) -> Self {
         Self(Arc::new(DnsPeerMgrInner {
-            peers: Cache::builder().time_to_live(DNS_PEER_TTL).build(),
+            peers: Cache::builder().time_to_idle(DNS_PEER_TTI).build(),
             dirty: Default::default(),
             peer_mgr,
             global_ctx,