diff --git a/dist/images/start-cniserver.sh b/dist/images/start-cniserver.sh
index dd27f33d4f2..82bd63cf31b 100755
--- a/dist/images/start-cniserver.sh
+++ b/dist/images/start-cniserver.sh
@@ -4,7 +4,7 @@ set -euo pipefail
 CNI_SOCK=/run/openvswitch/kube-ovn-daemon.sock
 OVS_SOCK=/run/openvswitch/db.sock
 ENABLE_SSL=${ENABLE_SSL:-false}
-SYSCTL_IPV4_IP_NO_PMTU_DISC=${SYSCTL_IPV4_IP_NO_PMTU_DISC:-1}
+SYSCTL_IPV4_IP_NO_PMTU_DISC=${SYSCTL_IPV4_IP_NO_PMTU_DISC:-0}
 SYSCTL_NF_CONNTRACK_TCP_BE_LIBERAL=${SYSCTL_NF_CONNTRACK_TCP_BE_LIBERAL:-1}
 SYSCTL_IPV4_NEIGH_DEFAULT_GC_THRESH=${SYSCTL_IPV4_NEIGH_DEFAULT_GC_THRESH:-"1024 2048 4096"}