diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index cf4749e..9bf66ee 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -918,6 +918,14 @@ void session_manager_free(struct session_manager *mgr)
      }
 }
 
+void session_manager_record_duplicated_packet(struct session_manager *mgr, const struct packet *pkt, uint64_t now)
+{
+     if (mgr->opts.duplicated_packet_filter_enable)
+     {
+          duplicated_packet_filter_add(mgr->dup_pkt_filter, pkt, now);
+     }
+}
+
 struct session *session_manager_new_session(struct session_manager *mgr, const struct packet *pkt, uint64_t now)
 {
      struct tuple6 key;
diff --git a/src/session/session_manager.h b/src/session/session_manager.h
index d86dfae..36ce1e7 100644
--- a/src/session/session_manager.h
+++ b/src/session/session_manager.h
@@ -99,6 +99,7 @@ struct session_manager_stat
 struct session_manager;
 struct session_manager *session_manager_new(struct session_manager_options *opts, uint64_t now);
 void session_manager_free(struct session_manager *mgr);
+void session_manager_record_duplicated_packet(struct session_manager *mgr, const struct packet *pkt, uint64_t now);
 
 struct session *session_manager_new_session(struct session_manager *mgr, const struct packet *pkt, uint64_t now);
 void session_manager_free_session(struct session_manager *mgr, struct session *sess);
diff --git a/src/stellar/inject.cpp b/src/stellar/inject.cpp
index 0e09fcf..39cc889 100644
--- a/src/stellar/inject.cpp
+++ b/src/stellar/inject.cpp
@@ -1,7 +1,7 @@
-#include <time.h>
 #include <errno.h>
 #include <assert.h>
 
+#include "times.h"
 #include "tcp_utils.h"
 #include "udp_utils.h"
 #include "ipv4_utils.h"
@@ -205,9 +205,7 @@ static inline void calc_tcp_fingerprint(struct tcp_fingerprint *finger)
 {
 #define RANGE(rand, start, end) (start + rand % (end - start + 1)) // [start, end]
 
-    struct timespec curtime;
-    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &curtime);
-    uint64_t random = (0x013579ABCDEF ^ (uint64_t)curtime.tv_nsec);
+    uint64_t random = 0x013579ABCDEF ^ stellar_get_monotonic_time_msec();
     finger->ipid = (uint16_t)(RANGE(random, 32767, 65535));
     finger->ttl = (uint8_t)(RANGE(random, 48, 120));
     finger->win = (uint16_t)(RANGE(random, 1000, 1460));
@@ -385,6 +383,7 @@ int inject_tcp_packet(const struct session *sess, enum flow_direction inject_dir
         (((flags) & TH_SYN) ? 1 : 0), (((flags) & TH_FIN) ? 1 : 0)
 
     uint16_t thr_idx = stellar_get_current_thread_index();
+    uint64_t time_ms = stellar_get_monotonic_time_msec();
 
     if (session_get_type(sess) != SESSION_TYPE_TCP)
     {
@@ -428,6 +427,7 @@ int inject_tcp_packet(const struct session *sess, enum flow_direction inject_dir
     packet_parse(&inj_pkt, buff, pkt_len);
     packet_set_origin(&inj_pkt, PACKET_ORIGIN_USERSTACK);
     packet_set_origin_ctx(&inj_pkt, &meta);
+    session_manager_record_duplicated_packet(runtime->threads[thr_idx].sess_mgr, &inj_pkt, time_ms);
     if (packet_io_inject(runtime->packet_io, thr_idx, &inj_pkt, 1) == 1)
     {
         session_inc_stat((struct session *)sess, inject_dir, STAT_INJECTED_PACKETS_SUCCESS, 1);
@@ -448,6 +448,7 @@ int inject_tcp_packet(const struct session *sess, enum flow_direction inject_dir
 int inject_udp_packet(const struct session *sess, enum flow_direction inject_dir, const char *payload, uint16_t len)
 {
     uint16_t thr_idx = stellar_get_current_thread_index();
+    uint64_t time_ms = stellar_get_monotonic_time_msec();
 
     if (session_get_type(sess) != SESSION_TYPE_UDP)
     {
@@ -485,6 +486,7 @@ int inject_udp_packet(const struct session *sess, enum flow_direction inject_dir
     packet_parse(&inj_pkt, buff, pkt_len);
     packet_set_origin(&inj_pkt, PACKET_ORIGIN_USERSTACK);
     packet_set_origin_ctx(&inj_pkt, &meta);
+    session_manager_record_duplicated_packet(runtime->threads[thr_idx].sess_mgr, &inj_pkt, time_ms);
     if (packet_io_inject(runtime->packet_io, thr_idx, &inj_pkt, 1) == 1)
     {
         session_inc_stat((struct session *)sess, inject_dir, STAT_INJECTED_PACKETS_SUCCESS, 1);