Merge pull request #120 from HyNetwork/wip-mtu-option

Option to disable MTU discovery

README.md

@@ -178,7 +178,8 @@ encryption. If you need a proxy, just use our proxy modes.
   "prometheus_listen": ":8080", // Prometheus HTTP metrics server listen address (at /metrics)
   "recv_window_conn": 15728640, // QUIC stream receive window
   "recv_window_client": 67108864, // QUIC connection receive window
-  "max_conn_client": 4096 // Max concurrent connections per client
+  "max_conn_client": 4096, // Max concurrent connections per client
+  "disable_mtu_discovery": false // Disable Path MTU Discovery (RFC 8899)
 }
 ```
 
@@ -300,7 +301,8 @@ hysteria_traffic_uplink_bytes_total{auth="aGFja2VyISE="} 37452
   "insecure": false, // Ignore all certificate errors 
   "ca": "my.ca", // Custom CA file
   "recv_window_conn": 15728640, // QUIC stream receive window
-  "recv_window": 67108864 // QUIC connection receive window
+  "recv_window": 67108864, // QUIC connection receive window
+  "disable_mtu_discovery": false // Disable Path MTU Discovery (RFC 8899)
 }
 ```
 

README.zh.md

@@ -164,7 +164,8 @@ Hysteria 是一个功能丰富的，专为恶劣网络环境进行优化的网
   "prometheus_listen": ":8080", // Prometheus 统计接口监听地址 (在 /metrics)
   "recv_window_conn": 15728640, // QUIC stream receive window
   "recv_window_client": 67108864, // QUIC connection receive window
-  "max_conn_client": 4096 // 单客户端最大活跃连接数
+  "max_conn_client": 4096, // 单客户端最大活跃连接数
+  "disable_mtu_discovery": false // 禁用 MTU 探测 (RFC 8899)
 }
 ```
 
@@ -285,7 +286,8 @@ hysteria_traffic_uplink_bytes_total{auth="aGFja2VyISE="} 37452
   "insecure": false, // 忽略一切证书错误 
   "ca": "my.ca", // 自定义 CA
   "recv_window_conn": 15728640, // QUIC stream receive window
-  "recv_window": 67108864 // QUIC connection receive window
+  "recv_window": 67108864, // QUIC connection receive window
+  "disable_mtu_discovery": false // 禁用 MTU 探测 (RFC 8899)
 }
 ```
 

cmd/client.go

@@ -57,6 +57,7 @@ func client(config *clientConfig) {
 		InitialConnectionReceiveWindow: config.ReceiveWindow,
 		MaxConnectionReceiveWindow:     config.ReceiveWindow,
 		KeepAlive:                      true,
+		DisablePathMTUDiscovery:        config.DisableMTUDiscovery,
 		EnableDatagrams:                true,
 	}
 	if config.ReceiveWindowConn == 0 {

cmd/config.go

@@ -42,6 +42,7 @@ type serverConfig struct {
 	ReceiveWindowConn   uint64 `json:"recv_window_conn"`
 	ReceiveWindowClient uint64 `json:"recv_window_client"`
 	MaxConnClient       int    `json:"max_conn_client"`
+	DisableMTUDiscovery bool   `json:"disable_mtu_discovery"`
 }
 
 func (c *serverConfig) Check() error {
@@ -115,15 +116,16 @@ type clientConfig struct {
 		Listen  string `json:"listen"`
 		Timeout int    `json:"timeout"`
 	} `json:"tproxy_udp"`
-	ACL               string `json:"acl"`
-	Obfs              string `json:"obfs"`
-	Auth              []byte `json:"auth"`
-	AuthString        string `json:"auth_str"`
-	ServerName        string `json:"server_name"`
-	Insecure          bool   `json:"insecure"`
-	CustomCA          string `json:"ca"`
-	ReceiveWindowConn uint64 `json:"recv_window_conn"`
-	ReceiveWindow     uint64 `json:"recv_window"`
+	ACL                 string `json:"acl"`
+	Obfs                string `json:"obfs"`
+	Auth                []byte `json:"auth"`
+	AuthString          string `json:"auth_str"`
+	ServerName          string `json:"server_name"`
+	Insecure            bool   `json:"insecure"`
+	CustomCA            string `json:"ca"`
+	ReceiveWindowConn   uint64 `json:"recv_window_conn"`
+	ReceiveWindow       uint64 `json:"recv_window"`
+	DisableMTUDiscovery bool   `json:"disable_mtu_discovery"`
 }
 
 func (c *clientConfig) Check() error {

cmd/server.go

@@ -61,6 +61,7 @@ func server(config *serverConfig) {
 		MaxConnectionReceiveWindow:     config.ReceiveWindowClient,
 		MaxIncomingStreams:             int64(config.MaxConnClient),
 		KeepAlive:                      true,
+		DisablePathMTUDiscovery:        config.DisableMTUDiscovery,
 		EnableDatagrams:                true,
 	}
 	if config.ReceiveWindowConn == 0 {