diff --git a/0169-pingpong-fix-send-dup-ack.patch b/0169-pingpong-fix-send-dup-ack.patch
new file mode 100644
index 0000000000000000000000000000000000000000..b49b56f7b9457a8ba2df1e2ea43045541ed924f6
--- /dev/null
+++ b/0169-pingpong-fix-send-dup-ack.patch
@@ -0,0 +1,51 @@
+From c46244f54dba29e5a3c40ef276022994b7994f82 Mon Sep 17 00:00:00 2001
+From: jiangheng <jiangheng14@huawei.com>
+Date: Mon, 30 Sep 2024 18:13:21 +0800
+Subject: [PATCH] pingpong: fix send dup ack
+
+---
+ src/core/tcp.c    | 11 ++++++-----
+ src/core/tcp_in.c |  3 +--
+ 2 files changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/src/core/tcp.c b/src/core/tcp.c
+index 4a3c031..849a210 100644
+--- a/src/core/tcp.c
++++ b/src/core/tcp.c
+@@ -1702,13 +1702,14 @@ tcp_fasttmr_start:
+     if (pcb->last_timer != tcp_timer_ctr) {
+       struct tcp_pcb *next;
+       pcb->last_timer = tcp_timer_ctr;
+-#if !GAZELLE_TCP_PINGPONG_MODE
+-      /* send delayed ACKs */
+-      if (pcb->flags & TF_ACK_DELAY) {
+-#else
+-      if (!tcp_in_pingpong(pcb) || TIME_BEFORE(pcb->lrcvtime + TCP_ATO_MS, sys_now())) {
++#if GAZELLE_TCP_PINGPONG_MODE
++      if (tcp_in_pingpong(pcb) && TIME_BEFORE(pcb->lrcvtime + TCP_ATO_MS, sys_now())) {
+         tcp_exit_pingpong(pcb);
++        tcp_set_flags(pcb, TF_ACK_DELAY);
++      }
+ #endif
++      /* send delayed ACKs */
++      if (pcb->flags & TF_ACK_DELAY) {
+         LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
+         MIB2_STATS_INC(mib2.tcpdelayackcnt);
+         tcp_ack_now(pcb);
+diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
+index 1751561..fa2a88b 100644
+--- a/src/core/tcp_in.c
++++ b/src/core/tcp_in.c
+@@ -1767,8 +1767,7 @@ tcp_receive(struct tcp_pcb *pcb)
+         /* Acknowledge the segment(s). */
+ #if GAZELLE_TCP_PINGPONG_MODE
+         if (tcp_in_pingpong(pcb)) {
+-          tcp_clear_flags(pcb, TF_ACK_NOW);
+-          tcp_set_flags(pcb, TF_ACK_DELAY);
++          tcp_clear_flags(pcb, TF_ACK_NOW | TF_ACK_DELAY);
+         } else {
+           tcp_ack(pcb);
+         }
+-- 
+2.33.0
+
diff --git a/lwip.spec b/lwip.spec
index 98723749b688f2c398d2941bffe959bec64c3dd3..764b17c84d5d7dbf4e4967309ee1be07b370b2a5 100644
--- a/lwip.spec
+++ b/lwip.spec
@@ -4,7 +4,7 @@
 Summary: lwip is a small independent implementation of the TCP/IP protocol suite
 Name:    lwip
 Version: 2.2.0
-Release: 58
+Release: 59
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.zip
@@ -180,6 +180,7 @@ Patch9164:  0165-LOG-modified-gazelle-log-level-and-add-item-in-mib2.patch
 Patch9165:  0166-cleancode-rename-log-level.patch
 Patch9166:  0167-lwip-add-pingpong-mode-support.patch
 Patch9167:  0168-lwip-adapt-interrupt-mode.patch
+Patch9168:  0169-pingpong-fix-send-dup-ack.patch
 
 BuildRequires: gcc-c++ dos2unix dpdk-devel
 
@@ -209,6 +210,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Mon Sep 30 2024 jiangheng <jiangheng14@huawei.com> - 2.2.0-59
+- pingpong: fix send dup ack in fast timer
+
 * Fri Sep 27 2024 jiangheng <jiangheng14@huawei.com> - 2.2.0-58
 - adapt for interrupt mode