diff --git a/clash_lib/src/app/dns/system.rs b/clash_lib/src/app/dns/system.rs
index a0f35aa5d..a42a148b6 100644
--- a/clash_lib/src/app/dns/system.rs
+++ b/clash_lib/src/app/dns/system.rs
@@ -31,6 +31,7 @@ impl ClashResolver for SystemResolver {
         Ok(response
             .iter()
             .map(|x| x.ip())
+            .filter(|x| self.ipv6() || x.is_ipv4())
             .choose(&mut rand::thread_rng()))
     }
 
diff --git a/clash_lib/src/proxy/tun/inbound.rs b/clash_lib/src/proxy/tun/inbound.rs
index a3583284d..e1b5a7437 100644
--- a/clash_lib/src/proxy/tun/inbound.rs
+++ b/clash_lib/src/proxy/tun/inbound.rs
@@ -37,7 +37,7 @@ async fn handle_inbound_stream(
         ..Default::default()
     };
 
-    debug!("new tun TCP connection: {}", sess);
+    debug!("new tun TCP session assigned: {}", sess);
     dispatcher.dispatch_stream(sess, stream).await;
 }
 
@@ -240,6 +240,8 @@ pub fn get_runner(
             while let Some((stream, local_addr, remote_addr)) =
                 tcp_listener.next().await
             {
+                debug!("new tun TCP connection: {} -> {}", local_addr, remote_addr);
+
                 tokio::spawn(handle_inbound_stream(
                     stream,
                     local_addr,
diff --git a/clash_lib/src/proxy/utils/socket_helpers.rs b/clash_lib/src/proxy/utils/socket_helpers.rs
index 2d33caf01..90e792975 100644
--- a/clash_lib/src/proxy/utils/socket_helpers.rs
+++ b/clash_lib/src/proxy/utils/socket_helpers.rs
@@ -95,7 +95,7 @@ pub async fn new_tcp_stream<'a>(
         ))?;
 
     debug!(
-        "dialing {}[{}]:{} via {:?}",
+        "dialing {}[{}]:{} via iface {:?}",
         address, dial_addr, port, iface
     );
 
@@ -115,6 +115,7 @@ pub async fn new_tcp_stream<'a>(
     };
 
     if let Some(iface) = iface {
+        debug!("binding tcp socket to interface: {:?}", iface);
         must_bind_socket_on_interface(&socket, iface)?;
     }
 
@@ -175,7 +176,7 @@ pub async fn new_udp_socket(
             socket.bind(&(*src).into())?;
         }
         (None, Some(iface)) => {
-            debug!("binding socket to interface: {:?}", iface);
+            debug!("binding udp socket to interface: {:?}", iface);
             must_bind_socket_on_interface(&socket, iface).inspect_err(|x| {
                 error!("failed to bind socket to interface: {}", x);
             })?;