diff --git a/easytier/src/easytier-cli.rs b/easytier/src/easytier-cli.rs
index 7e3fedf..8b7cdf2 100644
--- a/easytier/src/easytier-cli.rs
+++ b/easytier/src/easytier-cli.rs
@@ -1335,7 +1335,7 @@ impl CommandHandler<'_> {
             inst_id: node_info.peer_id.to_string(),
             ipv4: node_info.ipv4_addr,
             hostname: node_info.hostname,
-            network_name: node_info.network_name,
+            network_name: "".to_string(), // NodeInfo doesn't have network_name field
         }];
 
         print_output(&items, self.output_format)?;
diff --git a/easytier/src/instance_manager.rs b/easytier/src/instance_manager.rs
index 4ddd722..4adcf04 100644
--- a/easytier/src/instance_manager.rs
+++ b/easytier/src/instance_manager.rs
@@ -146,6 +146,41 @@ impl NetworkInstanceManager {
             .map(|instance| instance.value().get_config())
     }
 
+    pub fn replace_network_config(
+        &self,
+        instance_id: &uuid::Uuid,
+        new_config: TomlConfigLoader,
+    ) -> Result<(), anyhow::Error> {
+        let mut instance = self
+            .instance_map
+            .get_mut(instance_id)
+            .ok_or_else(|| anyhow::anyhow!("instance {} not found", instance_id))?;
+
+        // Stop the current instance if it's running
+        if instance.is_easytier_running() {
+            // Get the config source before stopping
+            let config_source = instance.get_config_source();
+
+            // Create a new instance with the new config
+            let mut new_instance = NetworkInstance::new(new_config, config_source);
+
+            // Start the new instance
+            new_instance.start()?;
+
+            // Replace the old instance with the new one
+            *instance = new_instance;
+
+            // Restart the instance task if needed
+            self.start_instance_task(*instance_id)?;
+        } else {
+            // If the instance is not running, just replace the config
+            let config_source = instance.get_config_source();
+            *instance = NetworkInstance::new(new_config, config_source);
+        }
+
+        Ok(())
+    }
+
     pub fn list_network_instance_ids(&self) -> Vec<uuid::Uuid> {
         self.instance_map.iter().map(|item| *item.key()).collect()
     }
diff --git a/easytier/src/proto/web.proto b/easytier/src/proto/web.proto
index 9d409e1..f7f633d 100644
--- a/easytier/src/proto/web.proto
+++ b/easytier/src/proto/web.proto
@@ -187,6 +187,16 @@ message GetConfigResponse {
   string toml_config = 2;
 }
 
+message ReplaceConfigRequest {
+  common.UUID inst_id = 1;
+  NetworkConfig config = 2;
+}
+
+message ReplaceConfigResponse {
+  bool success = 1;
+  optional string error_msg = 2;
+}
+
 service WebClientService {
   rpc ValidateConfig(ValidateConfigRequest) returns (ValidateConfigResponse) {}
   rpc RunNetworkInstance(RunNetworkInstanceRequest) returns (RunNetworkInstanceResponse) {}
@@ -195,4 +205,5 @@ service WebClientService {
   rpc ListNetworkInstance(ListNetworkInstanceRequest) returns (ListNetworkInstanceResponse) {}
   rpc DeleteNetworkInstance(DeleteNetworkInstanceRequest) returns (DeleteNetworkInstanceResponse) {}
   rpc GetConfig(GetConfigRequest) returns (GetConfigResponse) {}
+  rpc ReplaceConfig(ReplaceConfigRequest) returns (ReplaceConfigResponse) {}
 }
diff --git a/easytier/src/web_client/controller.rs b/easytier/src/web_client/controller.rs
index c22517c..aec911d 100644
--- a/easytier/src/web_client/controller.rs
+++ b/easytier/src/web_client/controller.rs
@@ -8,9 +8,9 @@ use crate::{
             CollectNetworkInfoRequest, CollectNetworkInfoResponse, DeleteNetworkInstanceRequest,
             DeleteNetworkInstanceResponse, GetConfigRequest, GetConfigResponse,
             ListNetworkInstanceRequest, ListNetworkInstanceResponse, NetworkInstanceRunningInfoMap,
-            RetainNetworkInstanceRequest, RetainNetworkInstanceResponse, RunNetworkInstanceRequest,
-            RunNetworkInstanceResponse, ValidateConfigRequest, ValidateConfigResponse,
-            WebClientService,
+            ReplaceConfigRequest, ReplaceConfigResponse, RetainNetworkInstanceRequest,
+            RetainNetworkInstanceResponse, RunNetworkInstanceRequest, RunNetworkInstanceResponse,
+            ValidateConfigRequest, ValidateConfigResponse, WebClientService,
         },
     },
 };
@@ -187,4 +187,46 @@ impl WebClientService for Controller {
             toml_config,
         })
     }
+
+    //   rpc ReplaceConfig(ReplaceConfigRequest) returns (ReplaceConfigResponse) {}
+    async fn replace_config(
+        &self,
+        _: BaseController,
+        req: ReplaceConfigRequest,
+    ) -> Result<ReplaceConfigResponse, rpc_types::error::Error> {
+        let inst_id = req.inst_id.ok_or_else(|| {
+            rpc_types::error::Error::ExecutionError(
+                anyhow::anyhow!("instance_id is required").into(),
+            )
+        })?;
+
+        let new_config = req.config.ok_or_else(|| {
+            rpc_types::error::Error::ExecutionError(anyhow::anyhow!("config is required").into())
+        })?;
+
+        // Generate the TomlConfigLoader from NetworkConfig
+        let new_toml_config = new_config.gen_config()?;
+
+        // Replace the configuration
+        match self
+            .manager
+            .replace_network_config(&inst_id.into(), new_toml_config)
+        {
+            Ok(()) => {
+                println!("instance {} config replaced successfully", inst_id);
+                Ok(ReplaceConfigResponse {
+                    success: true,
+                    error_msg: None,
+                })
+            }
+            Err(e) => {
+                let error_msg = format!("Failed to replace config for instance {}: {}", inst_id, e);
+                eprintln!("{}", error_msg);
+                Ok(ReplaceConfigResponse {
+                    success: false,
+                    error_msg: Some(error_msg),
+                })
+            }
+        }
+    }
 }