diff --git a/src/bin/punchnet/main.rs b/src/bin/punchnet/main.rs
index dab3d83..d6a8795 100755
--- a/src/bin/punchnet/main.rs
+++ b/src/bin/punchnet/main.rs
@@ -113,8 +113,7 @@ async fn main() {
 
     match tokio::signal::ctrl_c().await {
         Ok(()) => {
-            restore_dns();
-            println!("restoreing dns");
+            let _ = restore_dns();
         }
         Err(err) => {
             eprintln!("failed to listen for shutdown signal: {}", err);
diff --git a/src/network/tun_linux.rs b/src/network/tun_linux.rs
index 01279cd..424cd91 100755
--- a/src/network/tun_linux.rs
+++ b/src/network/tun_linux.rs
@@ -153,10 +153,7 @@ impl Iface {
             }
 
             if let Err(e) = set_dns(self, &self.name, network_domain, &ip_to_string(&default_gw)) {
-                println!("failed to set dns: {}", e.as_str());
                 error!("failed to set dns: {}", e.as_str());
-            } else {
-                println!("set dns ok");
             }
         } else {
             info!("set tun device");
@@ -179,10 +176,7 @@ impl Iface {
             }
 
             if let Err(e) = set_dns(self, &self.name, network_domain, &ip_to_string(&default_gw)) {
-                println!("failed to set dns: {}", e.as_str());
                 error!("failed to set dns: {}", e.as_str());
-            } else {
-                println!("set dns ok");
             }
         }
     }
@@ -228,12 +222,10 @@ impl TunTapPacketHandler for Iface {
                 if let Some(ip) = headers.net {
                     match ip {
                         etherparse::NetHeaders::Ipv4(ipv4, _) => {
-                            println!("3, target = {}.{}.{}.{}", ipv4.destination[0], ipv4.destination[1], ipv4.destination[2], ipv4.destination[3]);
                             if u32::from_be_bytes(ipv4.destination) == DNS_IP {
                                 // should send to dns
-                                println!("got dns request");
                                 if let Err(e) = edge.udp_sock_for_dns.send_to(&data[14..], format!("{}:15353", edge.server_ip)).await {
-                                    println!("failed to send request to 15353: {}", e);
+                                    error!("failed to send request to 15353: {}", e);
                                 }
                                 // edge.udp_sock_for_dns.send_to()
                                 return Ok(())
@@ -597,7 +589,7 @@ fn set_dns(
         add_resolvectl(name, network_domain)?;
     } else {
         backup_resolv_conf()?;
-        modify_resolv_conf(&vec!["100.100.100.100".to_owned()], true)?;
+        modify_resolv_conf(&vec!["100.100.100.100".to_owned()], network_domain, true)?;
     }
     add_dns_route(gw)?;
     Ok(())
@@ -617,7 +609,7 @@ pub fn restore_dns() -> Result<()> {
 ///
 /// - `new_nameservers`: 新的 nameserver 列表（IPv4/IPv6 字符串）
 /// - `keep_other_ns`: 是否保留原有的 nameserver（true = 追加到新列表后，false = 完全替换）
-pub fn modify_resolv_conf(new_nameservers: &[String], keep_other_ns: bool) -> Result<()> {
+pub fn modify_resolv_conf(new_nameservers: &[String], search_domain: &str, keep_other_ns: bool) -> Result<()> {
     let path = Path::new(RESOLV_FILE);
     if !path.exists() {
         return Err(SDLanError::IOError(format!("{} does not exists", RESOLV_FILE)));
@@ -636,6 +628,7 @@ pub fn modify_resolv_conf(new_nameservers: &[String], keep_other_ns: bool) -> Re
 
     let mut inserted = false;
     let mut encounted_nameserver = false;
+    let mut search_added = false;
 
     for line in reader.lines() {
         let line = line?;
@@ -657,20 +650,25 @@ pub fn modify_resolv_conf(new_nameservers: &[String], keep_other_ns: bool) -> Re
                 }
             }
             // 保留非 nameserver 行（注释、search、options 等）
-            lines.push(line);
+            if trimmed.starts_with("search ") {
+                lines.push(format!("{} {}", trimmed, search_domain));
+                search_added = true;
+            } else {
+                lines.push(line);
+            }
         }
     }
+    if !search_added {
+        lines.push(format!("search {}", search_domain));
+    }
 
     // 原子写入：先写临时文件
     let tmp_dir = Path::new("/etc");
     let tmp_path = tmp_dir.join("resolv.conf.tmp");
     let mut tmp_file = fs::File::create(&tmp_path)?;
-    println!("new resolv.conf: ");
     for l in &lines {
         writeln!(tmp_file, "{}", l)?;
-        println!("{}", l);
     }
-    println!("");
     tmp_file.flush()?;
 
     // 设置权限