diff --git a/easytier/src/dns/client_mgr.rs b/easytier/src/dns/client_mgr.rs
index 4a99d55c..ebb354af 100644
--- a/easytier/src/dns/client_mgr.rs
+++ b/easytier/src/dns/client_mgr.rs
@@ -1,4 +1,5 @@
-use crate::dns::utils::{DirtyFlag, DirtyState, NameServerAddr};
+use crate::dns::utils::addr::NameServerAddr;
+use crate::dns::utils::dirty::{DirtyFlag, DirtyState};
 use crate::dns::zone::{Zone, ZoneGroup};
 use crate::proto::dns::DnsClientMgrRpc;
 use crate::proto::dns::{DnsSnapshot, HeartbeatRequest, HeartbeatResponse};
diff --git a/easytier/src/dns/config/dns.rs b/easytier/src/dns/config/dns.rs
index 2af4c438..8288b731 100644
--- a/easytier/src/dns/config/dns.rs
+++ b/easytier/src/dns/config/dns.rs
@@ -2,7 +2,8 @@ use crate::common::global_ctx::GlobalCtx;
 use crate::dns::config::policy::DnsPolicyConfig;
 use crate::dns::config::zone::ZoneConfig;
 use crate::dns::config::{DNS_DEFAULT_ADDRESS, DNS_DEFAULT_TLD};
-use crate::dns::utils::{parse, NameServerAddrGroup};
+use crate::dns::utils::addr::NameServerAddrGroup;
+use crate::dns::utils::parse;
 use crate::proto::dns::GetExportConfigResponse;
 use derivative::Derivative;
 use gethostname::gethostname;
diff --git a/easytier/src/dns/config/mod.rs b/easytier/src/dns/config/mod.rs
index b2e68789..86331ae4 100644
--- a/easytier/src/dns/config/mod.rs
+++ b/easytier/src/dns/config/mod.rs
@@ -1,4 +1,4 @@
-use crate::dns::utils::NameServerAddr;
+use crate::dns::utils::addr::NameServerAddr;
 use hickory_proto::rr::LowerName;
 use hickory_proto::xfer::Protocol;
 use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4};
diff --git a/easytier/src/dns/config/zone.rs b/easytier/src/dns/config/zone.rs
index 1ea3e013..2bfe45e5 100644
--- a/easytier/src/dns/config/zone.rs
+++ b/easytier/src/dns/config/zone.rs
@@ -1,5 +1,5 @@
 use crate::dns::config::policy::{DnsExportPolicy, ZonePolicyConfig};
-use crate::dns::utils::NameServerAddrGroup;
+use crate::dns::utils::addr::NameServerAddrGroup;
 use crate::dns::zone::Zone;
 use crate::proto::dns::ZoneData;
 use derivative::Derivative;
diff --git a/easytier/src/dns/mod.rs b/easytier/src/dns/mod.rs
index b7451832..3fc5bb29 100644
--- a/easytier/src/dns/mod.rs
+++ b/easytier/src/dns/mod.rs
@@ -3,5 +3,5 @@ mod client_mgr;
 pub mod config;
 mod peer_mgr;
 mod server;
-pub mod utils;
+mod utils;
 pub mod zone;
diff --git a/easytier/src/dns/peer_mgr.rs b/easytier/src/dns/peer_mgr.rs
index 2bb3b6eb..b04cfe77 100644
--- a/easytier/src/dns/peer_mgr.rs
+++ b/easytier/src/dns/peer_mgr.rs
@@ -1,7 +1,7 @@
 use crate::common::config::ConfigLoader;
 use crate::common::PeerId;
 use crate::dns::config::{DnsExportConfig, DnsGlobalCtxExt};
-use crate::dns::utils::{DirtyFlag, DirtyState};
+use crate::dns::utils::dirty::{DirtyFlag, DirtyState};
 use crate::dns::zone::ZoneGroup;
 use crate::peer_center::instance::PeerCenterPeerManagerTrait;
 use crate::peers::peer_manager::PeerManager;
diff --git a/easytier/src/dns/server.rs b/easytier/src/dns/server.rs
index 4f2005b1..a414f910 100644
--- a/easytier/src/dns/server.rs
+++ b/easytier/src/dns/server.rs
@@ -1,5 +1,7 @@
-use super::utils::NameServerAddr;
 use crate::dns::client_mgr::DnsClientMgr;
+use crate::dns::utils::addr::NameServerAddr;
+use crate::peers::peer_manager::PeerManager;
+use crate::proto::dns::DnsClientMgrRpcServer;
 use derivative::Derivative;
 use derive_more::{Deref, DerefMut, From, Into};
 use hickory_proto::rr::Record;
@@ -18,8 +20,6 @@ use std::{sync::Arc, time::Duration};
 use tokio::net::{TcpListener, UdpSocket};
 use tokio::{sync::RwLock, task::JoinHandle};
 use tokio_util::sync::CancellationToken;
-use crate::peers::peer_manager::PeerManager;
-use crate::proto::dns::DnsClientMgrRpcServer;
 
 #[derive(Clone)]
 pub struct DynamicCatalog {
diff --git a/easytier/src/dns/utils.rs b/easytier/src/dns/utils.rs
deleted file mode 100644
index 2eca4187..00000000
--- a/easytier/src/dns/utils.rs
+++ /dev/null
@@ -1,309 +0,0 @@
-use crate::dns::config::DNS_SUPPORTED_PROTOCOLS;
-use crate::proto;
-use crate::proto::utils::RepeatedMessageModel;
-use anyhow::{anyhow, Error};
-use derive_more::{Deref, DerefMut};
-use hickory_proto::rr::{LowerName, RecordType};
-use hickory_proto::xfer::Protocol;
-use hickory_resolver::config::{NameServerConfig, NameServerConfigGroup};
-use hickory_server::authority::{
-    Authority, LookupControlFlow, LookupObject, LookupOptions, MessageRequest, UpdateResult,
-    ZoneType,
-};
-use hickory_server::server::RequestInfo;
-use idna::AsciiDenyList;
-use itertools::Itertools;
-use serde_with::{DeserializeFromStr, SerializeDisplay};
-use std::fmt::{Display, Formatter};
-use std::net::{IpAddr, SocketAddr};
-use std::str::FromStr;
-use std::sync::atomic::{AtomicBool, Ordering};
-use tokio::sync::Notify;
-use url::Url;
-
-pub fn sanitize(name: &str) -> String {
-    let dot = name.ends_with('.');
-    let mut name = idna::domain_to_ascii_cow(name.as_ref(), AsciiDenyList::EMPTY)
-        .unwrap_or_default()
-        .into_owned()
-        .to_lowercase()
-        .split('.')
-        .map(|label| {
-            label
-                .chars()
-                .map(|c| if c.is_ascii_alphanumeric() { c } else { '-' })
-                .take(63)
-                .collect::<String>()
-                .trim_matches('-')
-                .to_string()
-        })
-        .filter(|label| !label.is_empty())
-        .collect_vec()
-        .join(".");
-    name.truncate(253);
-    if dot {
-        name.push('.');
-    }
-    name
-}
-
-pub fn parse(name: &str) -> LowerName {
-    if let Ok(name) = name.parse() {
-        name
-    } else {
-        let sanitized = sanitize(name);
-        tracing::debug!("invalid hostname: {}, sanitized to: {}", name, sanitized);
-        sanitized.parse().unwrap_or_default()
-    }
-}
-
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, SerializeDisplay, DeserializeFromStr)]
-pub struct NameServerAddr {
-    pub(super) protocol: Protocol,
-    pub(super) addr: SocketAddr,
-}
-
-impl From<NameServerAddr> for NameServerConfig {
-    fn from(value: NameServerAddr) -> Self {
-        Self::new(value.addr, value.protocol)
-    }
-}
-
-impl From<NameServerConfig> for NameServerAddr {
-    fn from(value: NameServerConfig) -> Self {
-        Self {
-            protocol: value.protocol,
-            addr: value.socket_addr,
-        }
-    }
-}
-
-impl From<SocketAddr> for NameServerAddr {
-    fn from(value: SocketAddr) -> Self {
-        Self {
-            protocol: Protocol::Udp,
-            addr: value,
-        }
-    }
-}
-
-impl From<IpAddr> for NameServerAddr {
-    fn from(value: IpAddr) -> Self {
-        SocketAddr::new(value, 53).into()
-    }
-}
-
-impl From<NameServerAddr> for Url {
-    fn from(value: NameServerAddr) -> Self {
-        Url::parse(&format!("{}://{}", value.protocol, value.addr)).unwrap()
-    }
-}
-
-impl TryFrom<&Url> for NameServerAddr {
-    type Error = Error;
-
-    fn try_from(value: &Url) -> Result<Self, Self::Error> {
-        let scheme = value.scheme();
-        let protocol = *DNS_SUPPORTED_PROTOCOLS
-            .iter()
-            .find(|p| p.to_string() == scheme)
-            .ok_or(anyhow!("unsupported scheme: {}", scheme))?;
-        let addr = value.host_str().ok_or(anyhow!("host not found"))?;
-        let addr = addr
-            .trim_start_matches('[')
-            .trim_end_matches(']')
-            .parse::<IpAddr>()
-            .map_err(|e| anyhow!("invalid ip address '{}': {}", addr, e))?;
-        let port = if let Some(port) = value.port() {
-            port
-        } else {
-            match protocol {
-                Protocol::Udp | Protocol::Tcp => 53,
-                _ => return Err(anyhow!("port not found")),
-            }
-        };
-
-        Ok(Self {
-            protocol,
-            addr: SocketAddr::new(addr, port),
-        })
-    }
-}
-
-impl From<NameServerAddr> for proto::common::Url {
-    fn from(value: NameServerAddr) -> Self {
-        Url::from(value).into()
-    }
-}
-
-impl TryFrom<&proto::common::Url> for NameServerAddr {
-    type Error = Error;
-
-    fn try_from(value: &proto::common::Url) -> Result<Self, Self::Error> {
-        Self::try_from(&Url::try_from(value)?)
-    }
-}
-
-impl FromStr for NameServerAddr {
-    type Err = Error;
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        macro_rules! try_parse {
-            ($($t:ty),+) => {
-                $( if let Ok(v) = s.parse::<$t>() { return Ok(v.into()); } )+
-            };
-        }
-
-        try_parse!(IpAddr, SocketAddr);
-
-        (&Url::parse(s)?).try_into()
-    }
-}
-
-impl Display for NameServerAddr {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.write_str(Url::from(*self).as_str())
-    }
-}
-
-pub(super) type NameServerAddrGroup = RepeatedMessageModel<NameServerAddr>;
-
-impl From<NameServerAddrGroup> for NameServerConfigGroup {
-    fn from(value: NameServerAddrGroup) -> Self {
-        value.into_iter().map_into().collect_vec().into()
-    }
-}
-
-impl From<NameServerConfigGroup> for NameServerAddrGroup {
-    fn from(value: NameServerConfigGroup) -> Self {
-        value
-            .into_inner()
-            .into_iter()
-            .map_into()
-            .collect_vec()
-            .into()
-    }
-}
-
-#[derive(Deref, DerefMut)]
-pub struct ChainedAuthority<A>(pub(super) A)
-where
-    A: Authority,
-    A::Lookup: LookupObject + 'static;
-
-impl<A> From<A> for ChainedAuthority<A>
-where
-    A: Authority,
-    A::Lookup: LookupObject + 'static,
-{
-    fn from(value: A) -> Self {
-        Self(value)
-    }
-}
-
-#[async_trait::async_trait]
-impl<A> Authority for ChainedAuthority<A>
-where
-    A: Authority,
-    A::Lookup: LookupObject + 'static,
-{
-    type Lookup = A::Lookup;
-
-    #[inline]
-    fn zone_type(&self) -> ZoneType {
-        self.0.zone_type()
-    }
-    #[inline]
-    fn is_axfr_allowed(&self) -> bool {
-        self.0.is_axfr_allowed()
-    }
-    #[inline]
-    async fn update(&self, update: &MessageRequest) -> UpdateResult<bool> {
-        self.0.update(update).await
-    }
-    #[inline]
-    fn origin(&self) -> &LowerName {
-        self.0.origin()
-    }
-    #[inline]
-    async fn lookup(
-        &self,
-        name: &LowerName,
-        rtype: RecordType,
-        lookup_options: LookupOptions,
-    ) -> LookupControlFlow<Self::Lookup> {
-        self.0.lookup(name, rtype, lookup_options).await
-    }
-    #[inline]
-    async fn consult(
-        &self,
-        name: &LowerName,
-        rtype: RecordType,
-        lookup_options: LookupOptions,
-        last_result: LookupControlFlow<Box<dyn LookupObject>>,
-    ) -> LookupControlFlow<Box<dyn LookupObject>> {
-        if let Some(Ok(l)) = last_result.map_result() {
-            LookupControlFlow::Break(Ok(l))
-        } else {
-            self.0
-                .lookup(name, rtype, lookup_options)
-                .await
-                .map(|l| Box::new(l) as _)
-        }
-    }
-    #[inline]
-    async fn search(
-        &self,
-        request_info: RequestInfo<'_>,
-        lookup_options: LookupOptions,
-    ) -> LookupControlFlow<Self::Lookup> {
-        self.0.search(request_info, lookup_options).await
-    }
-    #[inline]
-    async fn get_nsec_records(
-        &self,
-        name: &LowerName,
-        lookup_options: LookupOptions,
-    ) -> LookupControlFlow<Self::Lookup> {
-        self.0.get_nsec_records(name, lookup_options).await
-    }
-}
-
-#[derive(Debug, Deref, DerefMut)]
-pub(super) struct DirtyState<T> {
-    #[deref]
-    #[deref_mut]
-    flags: T,
-    pub notify: Notify,
-}
-
-impl<T: Default> Default for DirtyState<T> {
-    fn default() -> Self {
-        Self {
-            flags: T::default(),
-            notify: Notify::new(),
-        }
-    }
-}
-
-#[derive(Debug)]
-pub(super) struct DirtyFlag(AtomicBool);
-
-impl DirtyFlag {
-    pub fn new(value: bool) -> Self {
-        Self(AtomicBool::new(value))
-    }
-
-    pub fn mark(&self) {
-        self.0.store(true, Ordering::Release);
-    }
-
-    pub fn reset(&self) -> bool {
-        self.0.swap(false, Ordering::Acquire)
-    }
-}
-
-impl Default for DirtyFlag {
-    fn default() -> Self {
-        Self::new(true)
-    }
-}
diff --git a/easytier/src/dns/utils/addr.rs b/easytier/src/dns/utils/addr.rs
new file mode 100644
index 00000000..055c14ff
--- /dev/null
+++ b/easytier/src/dns/utils/addr.rs
@@ -0,0 +1,139 @@
+use crate::dns::config::DNS_SUPPORTED_PROTOCOLS;
+use crate::proto;
+use crate::proto::utils::RepeatedMessageModel;
+use anyhow::{anyhow, Error};
+use hickory_proto::xfer::Protocol;
+use hickory_resolver::config::{NameServerConfig, NameServerConfigGroup};
+use itertools::Itertools;
+use serde_with::{DeserializeFromStr, SerializeDisplay};
+use std::fmt::{Display, Formatter};
+use std::net::{IpAddr, SocketAddr};
+use std::str::FromStr;
+use url::Url;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, SerializeDisplay, DeserializeFromStr)]
+pub struct NameServerAddr {
+    pub protocol: Protocol,
+    pub addr: SocketAddr,
+}
+
+impl From<NameServerAddr> for NameServerConfig {
+    fn from(value: NameServerAddr) -> Self {
+        Self::new(value.addr, value.protocol)
+    }
+}
+
+impl From<NameServerConfig> for NameServerAddr {
+    fn from(value: NameServerConfig) -> Self {
+        Self {
+            protocol: value.protocol,
+            addr: value.socket_addr,
+        }
+    }
+}
+
+impl From<SocketAddr> for NameServerAddr {
+    fn from(value: SocketAddr) -> Self {
+        Self {
+            protocol: Protocol::Udp,
+            addr: value,
+        }
+    }
+}
+
+impl From<IpAddr> for NameServerAddr {
+    fn from(value: IpAddr) -> Self {
+        SocketAddr::new(value, 53).into()
+    }
+}
+
+impl From<NameServerAddr> for Url {
+    fn from(value: NameServerAddr) -> Self {
+        Url::parse(&format!("{}://{}", value.protocol, value.addr)).unwrap()
+    }
+}
+
+impl TryFrom<&Url> for NameServerAddr {
+    type Error = Error;
+
+    fn try_from(value: &Url) -> Result<Self, Self::Error> {
+        let scheme = value.scheme();
+        let protocol = *DNS_SUPPORTED_PROTOCOLS
+            .iter()
+            .find(|p| p.to_string() == scheme)
+            .ok_or(anyhow!("unsupported scheme: {}", scheme))?;
+        let addr = value.host_str().ok_or(anyhow!("host not found"))?;
+        let addr = addr
+            .trim_start_matches('[')
+            .trim_end_matches(']')
+            .parse::<IpAddr>()
+            .map_err(|e| anyhow!("invalid ip address '{}': {}", addr, e))?;
+        let port = if let Some(port) = value.port() {
+            port
+        } else {
+            match protocol {
+                Protocol::Udp | Protocol::Tcp => 53,
+                _ => return Err(anyhow!("port not found")),
+            }
+        };
+
+        Ok(Self {
+            protocol,
+            addr: SocketAddr::new(addr, port),
+        })
+    }
+}
+
+impl From<NameServerAddr> for proto::common::Url {
+    fn from(value: NameServerAddr) -> Self {
+        Url::from(value).into()
+    }
+}
+
+impl TryFrom<&proto::common::Url> for NameServerAddr {
+    type Error = Error;
+
+    fn try_from(value: &proto::common::Url) -> Result<Self, Self::Error> {
+        Self::try_from(&Url::try_from(value)?)
+    }
+}
+
+impl FromStr for NameServerAddr {
+    type Err = Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        macro_rules! try_parse {
+            ($($t:ty),+) => {
+                $( if let Ok(v) = s.parse::<$t>() { return Ok(v.into()); } )+
+            };
+        }
+
+        try_parse!(IpAddr, SocketAddr);
+
+        (&Url::parse(s)?).try_into()
+    }
+}
+
+impl Display for NameServerAddr {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.write_str(Url::from(*self).as_str())
+    }
+}
+
+pub type NameServerAddrGroup = RepeatedMessageModel<NameServerAddr>;
+
+impl From<NameServerAddrGroup> for NameServerConfigGroup {
+    fn from(value: NameServerAddrGroup) -> Self {
+        value.into_iter().map_into().collect_vec().into()
+    }
+}
+
+impl From<NameServerConfigGroup> for NameServerAddrGroup {
+    fn from(value: NameServerConfigGroup) -> Self {
+        value
+            .into_inner()
+            .into_iter()
+            .map_into()
+            .collect_vec()
+            .into()
+    }
+}
diff --git a/easytier/src/dns/utils/authority.rs b/easytier/src/dns/utils/authority.rs
new file mode 100644
index 00000000..c2f5aa57
--- /dev/null
+++ b/easytier/src/dns/utils/authority.rs
@@ -0,0 +1,81 @@
+use derive_more::{Deref, DerefMut, From};
+use hickory_proto::rr::{LowerName, RecordType};
+use hickory_server::authority::{
+    Authority, LookupControlFlow, LookupObject, LookupOptions, MessageRequest, UpdateResult,
+    ZoneType,
+};
+use hickory_server::server::RequestInfo;
+
+#[derive(From, Deref, DerefMut)]
+pub struct ChainedAuthority<A>(A)
+where
+    A: Authority,
+    A::Lookup: LookupObject + 'static;
+
+#[async_trait::async_trait]
+impl<A> Authority for ChainedAuthority<A>
+where
+    A: Authority,
+    A::Lookup: LookupObject + 'static,
+{
+    type Lookup = A::Lookup;
+
+    #[inline]
+    fn zone_type(&self) -> ZoneType {
+        self.0.zone_type()
+    }
+    #[inline]
+    fn is_axfr_allowed(&self) -> bool {
+        self.0.is_axfr_allowed()
+    }
+    #[inline]
+    async fn update(&self, update: &MessageRequest) -> UpdateResult<bool> {
+        self.0.update(update).await
+    }
+    #[inline]
+    fn origin(&self) -> &LowerName {
+        self.0.origin()
+    }
+    #[inline]
+    async fn lookup(
+        &self,
+        name: &LowerName,
+        rtype: RecordType,
+        lookup_options: LookupOptions,
+    ) -> LookupControlFlow<Self::Lookup> {
+        self.0.lookup(name, rtype, lookup_options).await
+    }
+    #[inline]
+    async fn consult(
+        &self,
+        name: &LowerName,
+        rtype: RecordType,
+        lookup_options: LookupOptions,
+        last_result: LookupControlFlow<Box<dyn LookupObject>>,
+    ) -> LookupControlFlow<Box<dyn LookupObject>> {
+        if let Some(Ok(l)) = last_result.map_result() {
+            LookupControlFlow::Break(Ok(l))
+        } else {
+            self.0
+                .lookup(name, rtype, lookup_options)
+                .await
+                .map(|l| Box::new(l) as _)
+        }
+    }
+    #[inline]
+    async fn search(
+        &self,
+        request_info: RequestInfo<'_>,
+        lookup_options: LookupOptions,
+    ) -> LookupControlFlow<Self::Lookup> {
+        self.0.search(request_info, lookup_options).await
+    }
+    #[inline]
+    async fn get_nsec_records(
+        &self,
+        name: &LowerName,
+        lookup_options: LookupOptions,
+    ) -> LookupControlFlow<Self::Lookup> {
+        self.0.get_nsec_records(name, lookup_options).await
+    }
+}
diff --git a/easytier/src/dns/utils/dirty.rs b/easytier/src/dns/utils/dirty.rs
new file mode 100644
index 00000000..3faa3247
--- /dev/null
+++ b/easytier/src/dns/utils/dirty.rs
@@ -0,0 +1,30 @@
+use derivative::Derivative;
+use derive_more::{Deref, DerefMut};
+use std::sync::atomic::{AtomicBool, Ordering};
+use tokio::sync::Notify;
+
+#[derive(Debug, Default, Deref, DerefMut)]
+pub struct DirtyState<T> {
+    #[deref]
+    #[deref_mut]
+    flags: T,
+    pub notify: Notify,
+}
+
+#[derive(Derivative, Debug)]
+#[derivative(Default)]
+pub struct DirtyFlag(#[derivative(Default(value = "AtomicBool::new(true)"))] AtomicBool);
+
+impl DirtyFlag {
+    pub fn new(value: bool) -> Self {
+        Self(AtomicBool::new(value))
+    }
+
+    pub fn mark(&self) {
+        self.0.store(true, Ordering::Release);
+    }
+
+    pub fn reset(&self) -> bool {
+        self.0.swap(false, Ordering::Acquire)
+    }
+}
diff --git a/easytier/src/dns/utils/mod.rs b/easytier/src/dns/utils/mod.rs
new file mode 100644
index 00000000..4d54b157
--- /dev/null
+++ b/easytier/src/dns/utils/mod.rs
@@ -0,0 +1,43 @@
+use hickory_proto::rr::LowerName;
+use idna::AsciiDenyList;
+use itertools::Itertools;
+
+pub mod addr;
+pub mod authority;
+pub mod dirty;
+
+pub fn sanitize(name: &str) -> String {
+    let dot = name.ends_with('.');
+    let mut name = idna::domain_to_ascii_cow(name.as_ref(), AsciiDenyList::EMPTY)
+        .unwrap_or_default()
+        .into_owned()
+        .to_lowercase()
+        .split('.')
+        .map(|label| {
+            label
+                .chars()
+                .map(|c| if c.is_ascii_alphanumeric() { c } else { '-' })
+                .take(63)
+                .collect::<String>()
+                .trim_matches('-')
+                .to_string()
+        })
+        .filter(|label| !label.is_empty())
+        .collect_vec()
+        .join(".");
+    name.truncate(253);
+    if dot {
+        name.push('.');
+    }
+    name
+}
+
+pub fn parse(name: &str) -> LowerName {
+    if let Ok(name) = name.parse() {
+        name
+    } else {
+        let sanitized = sanitize(name);
+        tracing::debug!("invalid hostname: {}, sanitized to: {}", name, sanitized);
+        sanitized.parse().unwrap_or_default()
+    }
+}
diff --git a/easytier/src/dns/zone.rs b/easytier/src/dns/zone.rs
index 7dcf365c..4eafa181 100644
--- a/easytier/src/dns/zone.rs
+++ b/easytier/src/dns/zone.rs
@@ -1,5 +1,5 @@
 use crate::common::dns::get_default_resolver_config;
-use crate::dns::utils::NameServerAddr;
+use crate::dns::utils::addr::NameServerAddr;
 use crate::proto;
 use crate::proto::utils::RepeatedMessageModel;
 use crate::utils::MapTryInto;