socket.go           | 8 ++++++++
 sockopts_unix.go    | 4 ++++
 sockopts_wasm.go    | 4 ++++
 sockopts_windows.go | 4 ++++

diff --git a/socket.go b/socket.go
index 606665e2e65b03f8493254d469faaf8e2082c8a1..8512da99e720b75c40c02cd34c988a93897a8735 100644
--- a/socket.go
+++ b/socket.go
@@ -44,11 +44,16 @@ // client. Instead, this should be a last resort if we need to use holepunching, and only then to
 // connect to other clients that actually try to holepunch TCP.
 const dialTcpFromListenPort = false
 
+var SocketIPTypeOfService = 0
+
 var tcpListenConfig = net.ListenConfig{
 	Control: func(network, address string, c syscall.RawConn) (err error) {
 		controlErr := c.Control(func(fd uintptr) {
 			if dialTcpFromListenPort {
 				err = setReusePortSockOpts(fd)
+			}
+			if err == nil && SocketIPTypeOfService != 0 {
+				err = setSockIPTOS(fd, SocketIPTypeOfService)
 			}
 		})
 		if err != nil {
@@ -87,6 +92,9 @@ 				// allow dialling out from the client's listen port, but that doesn't really work. I
 				// think Linux older than ~2013 doesn't support SO_REUSEPORT.
 				if dialTcpFromListenPort {
 					err = setReusePortSockOpts(fd)
+				}
+				if err == nil && SocketIPTypeOfService != 0 {
+					err = setSockIPTOS(fd, SocketIPTypeOfService)
 				}
 			})
 			if err == nil {
diff --git a/sockopts_unix.go b/sockopts_unix.go
index 52ec9e8d371a3fdf7a6cc1ec479b5c0bc4f6c324..ffffddd6ec2a7ffd175eb3620dab40dba3ca2c51 100644
--- a/sockopts_unix.go
+++ b/sockopts_unix.go
@@ -27,3 +27,7 @@
 func setSockNoLinger(fd uintptr) (err error) {
 	return syscall.SetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &lingerOffVal)
 }
+
+func setSockIPTOS(fd uintptr, val int) (err error) {
+	return syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_TOS, val)
+}
diff --git a/sockopts_wasm.go b/sockopts_wasm.go
index 9705b914201b5501ad026058cdbdad94a18de9ca..8411affe1fd93ad074ff47fceb61d4b99f8fcce0 100644
--- a/sockopts_wasm.go
+++ b/sockopts_wasm.go
@@ -10,3 +10,7 @@
 func setSockNoLinger(fd uintptr) error {
 	return nil
 }
+
+func setSockIPTOS(fd uintptr, val int) (err error) {
+	return nil
+}
diff --git a/sockopts_windows.go b/sockopts_windows.go
index c3c0ab0494760af60cf8701e32a47ac804876b0e..9d8061a9eb3ec6d1371ddb80e263cb39ddee0854 100644
--- a/sockopts_windows.go
+++ b/sockopts_windows.go
@@ -13,3 +13,7 @@
 func setSockNoLinger(fd uintptr) (err error) {
 	return syscall.SetsockoptLinger(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &lingerOffVal)
 }
+
+func setSockIPTOS(fd uintptr, val int) (err error) {
+	return nil
+}