diff -ur socket2-0.4.10-org/src/socket.rs socket2-0.4.10/src/socket.rs
--- socket2-0.4.10-org/src/socket.rs	2006-07-24 02:21:28.000000000 +0100
+++ socket2-0.4.10/src/socket.rs	2023-11-27 23:04:25.888522534 +0000
@@ -19,6 +19,7 @@
 #[cfg(windows)]
 use std::os::windows::io::{FromRawSocket, IntoRawSocket};
 use std::time::Duration;
+use libc;
 
 use crate::sys::{self, c_int, getsockopt, setsockopt, Bool};
 use crate::{Domain, Protocol, SockAddr, TcpKeepalive, Type};
@@ -833,6 +834,36 @@
         }
     }
 
+    /// Set value for the `IP_MTU_DISCOVER` option, aka. DF bit,  on this socket.
+    ///
+    /// Enable setting the DF bit on the sockets.
+    pub fn set_mtu_discover(&self, mtu_discover: bool) -> io::Result<()> {
+        let mut res1 = Err(io::ErrorKind::TimedOut.into());
+        if mtu_discover == true {
+            //print!("set_mtu_discover true\n");
+            unsafe {
+                res1 = setsockopt(
+                    self.as_raw(),
+                    libc::SOL_IP,
+                    libc::IP_MTU_DISCOVER,
+                    libc::IP_PMTUDISC_DO,
+                )
+            }
+        }
+        if mtu_discover == false {
+            //print!("set_mtu_discover false\n");
+            unsafe {
+                res1 = setsockopt(
+                    self.as_raw(),
+                    libc::SOL_IP,
+                    libc::IP_MTU_DISCOVER,
+                    libc::IP_PMTUDISC_DONT,
+                )
+            }
+        }
+        return res1;
+    }
+
     /// Get the value of the `SO_LINGER` option on this socket.
     ///
     /// For more information about this option, see [`set_linger`].