From 34157e6455b07723d11385212a4e1328f57f1da5 Mon Sep 17 00:00:00 2001
From: Marten Seemann <martenseemann@gmail.com>
Date: Tue, 26 Nov 2024 10:20:05 +0800
Subject: [PATCH] use IP_PMTUDISC_PROBE instead of IP_PMTUDISC_DO on Linux
 (#4729)

---
 sys_conn_df_linux.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys_conn_df_linux.go b/sys_conn_df_linux.go
index f09eaa5dff8..b09a2394e8e 100644
--- a/sys_conn_df_linux.go
+++ b/sys_conn_df_linux.go
@@ -16,8 +16,8 @@ func setDF(rawConn syscall.RawConn) (bool, error) {
 	// and the datagram will not be fragmented
 	var errDFIPv4, errDFIPv6 error
 	if err := rawConn.Control(func(fd uintptr) {
-		errDFIPv4 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_MTU_DISCOVER, unix.IP_PMTUDISC_DO)
-		errDFIPv6 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_MTU_DISCOVER, unix.IPV6_PMTUDISC_DO)
+		errDFIPv4 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_MTU_DISCOVER, unix.IP_PMTUDISC_PROBE)
+		errDFIPv6 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_MTU_DISCOVER, unix.IPV6_PMTUDISC_PROBE)
 	}); err != nil {
 		return false, err
 	}