diff --git a/src/duplicated_packet_filter/duplicated_packet_filter.cpp b/src/duplicated_packet_filter/duplicated_packet_filter.cpp
index e68de3a..47b1826 100644
--- a/src/duplicated_packet_filter/duplicated_packet_filter.cpp
+++ b/src/duplicated_packet_filter/duplicated_packet_filter.cpp
@@ -22,7 +22,6 @@ struct duplicated_packet_key
 
 struct duplicated_packet_filter
 {
-    uint8_t enable;
     struct expiry_dablooms_handle *dablooms;
 };
 
@@ -62,65 +61,19 @@ static inline int duplicated_packet_key_get(const struct packet *packet, struct
     return 0;
 }
 
-static int check_options(const struct duplicated_packet_filter_options *opts)
-{
-    if (opts == NULL)
-    {
-        DUPLICATED_PACKET_FILTER_LOG_ERROR("invalid options");
-        return -1;
-    }
-
-    if (opts->enable == 0)
-    {
-        return 0;
-    }
-
-    // UINT32_MAX = 4294967295
-    if (opts->capacity == 0)
-    {
-        DUPLICATED_PACKET_FILTER_LOG_ERROR("invalid capacity: %u, supported range: [1, 4294967295]", opts->capacity);
-        return -1;
-    }
-
-    if (opts->timeout < 1 || opts->timeout > 60000)
-    {
-        DUPLICATED_PACKET_FILTER_LOG_ERROR("invalid timeout: %u, supported range: [1, 60000]", opts->timeout);
-        return -1;
-    }
-
-    if (opts->error_rate < 0.0 || opts->error_rate > 1.0)
-    {
-        DUPLICATED_PACKET_FILTER_LOG_ERROR("invalid error_rate: %f, supported range: [0.0, 1.0]", opts->error_rate);
-        return -1;
-    }
-
-    return 0;
-}
-
 /******************************************************************************
  * Public API
  ******************************************************************************/
 
-struct duplicated_packet_filter *duplicated_packet_filter_new(const struct duplicated_packet_filter_options *opts, uint64_t now)
+struct duplicated_packet_filter *duplicated_packet_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now)
 {
-    if (check_options(opts) == -1)
-    {
-        return NULL;
-    }
-
     struct duplicated_packet_filter *filter = (struct duplicated_packet_filter *)calloc(1, sizeof(struct duplicated_packet_filter));
     if (filter == NULL)
     {
         return NULL;
     }
 
-    filter->enable = opts->enable;
-    if (filter->enable == 0)
-    {
-        return filter;
-    }
-
-    filter->dablooms = expiry_dablooms_new(opts->capacity, opts->error_rate, now, opts->timeout);
+    filter->dablooms = expiry_dablooms_new(capacity, error_rate, now, timeout);
     if (filter->dablooms == NULL)
     {
         free(filter);
@@ -148,11 +101,6 @@ void duplicated_packet_filter_free(struct duplicated_packet_filter *filter)
 // reutrn 0: no found
 int duplicated_packet_filter_lookup(struct duplicated_packet_filter *filter, const struct packet *packet, uint64_t now)
 {
-    if (filter->enable == 0)
-    {
-        return 0;
-    }
-
     struct duplicated_packet_key key;
     if (duplicated_packet_key_get(packet, &key) == -1)
     {
@@ -169,11 +117,6 @@ int duplicated_packet_filter_lookup(struct duplicated_packet_filter *filter, con
 
 void duplicated_packet_filter_add(struct duplicated_packet_filter *filter, const struct packet *packet, uint64_t now)
 {
-    if (filter->enable == 0)
-    {
-        return;
-    }
-
     struct duplicated_packet_key key;
     if (duplicated_packet_key_get(packet, &key) == -1)
     {
diff --git a/src/duplicated_packet_filter/duplicated_packet_filter.h b/src/duplicated_packet_filter/duplicated_packet_filter.h
index 04e3489..4e09071 100644
--- a/src/duplicated_packet_filter/duplicated_packet_filter.h
+++ b/src/duplicated_packet_filter/duplicated_packet_filter.h
@@ -13,16 +13,8 @@ extern "C"
 
 #define DUPLICATED_PACKET_FILTER_LOG_ERROR(format, ...) LOG_ERROR("duplicated packet filter", format, ##__VA_ARGS__)
 
-struct duplicated_packet_filter_options
-{
-    uint8_t enable;
-    uint32_t capacity; // range: [1, 4294967295] (UINT32_MAX = 4294967295)
-    uint32_t timeout;  // range: [1, 60000]
-    double error_rate; // range: [0.0, 1.0]
-};
-
 struct duplicated_packet_filter;
-struct duplicated_packet_filter *duplicated_packet_filter_new(const struct duplicated_packet_filter_options *opts, uint64_t now);
+struct duplicated_packet_filter *duplicated_packet_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now);
 void duplicated_packet_filter_free(struct duplicated_packet_filter *filter);
 
 // return 1: found
diff --git a/src/duplicated_packet_filter/test/gtest_duplicated_packet_filter.cpp b/src/duplicated_packet_filter/test/gtest_duplicated_packet_filter.cpp
index 3c66126..733a047 100644
--- a/src/duplicated_packet_filter/test/gtest_duplicated_packet_filter.cpp
+++ b/src/duplicated_packet_filter/test/gtest_duplicated_packet_filter.cpp
@@ -64,19 +64,16 @@ unsigned char data[] = {
     0x81, 0x80, 0x5c, 0x76, 0x00, 0x00, 0x00, 0x00, 0x80, 0x02, 0x20, 0x00, 0xf7, 0x57, 0x00, 0x00, 0x02, 0x04, 0x04, 0xc4, 0x01, 0x03, 0x03, 0x08, 0x01, 0x01,
     0x04, 0x02};
 
-struct duplicated_packet_filter_options opts = {
-    .enable = 1,
-    .capacity = 1000000,
-    .timeout = 2,
-    .error_rate = 0.00001,
-};
-
 TEST(DUPLICATED_PACKET_FILTER, TEST)
 {
     struct packet pkt;
+    uint32_t capacity = 1000000;
+    uint32_t timeout = 2;
+    double error_rate = 0.00001;
+
     packet_parse(&pkt, (const char *)data, sizeof(data));
 
-    struct duplicated_packet_filter *filter = duplicated_packet_filter_new(&opts, 1);
+    struct duplicated_packet_filter *filter = duplicated_packet_filter_new(capacity, timeout, error_rate, 1);
     EXPECT_TRUE(filter != nullptr);
 
     EXPECT_TRUE(duplicated_packet_filter_lookup(filter, &pkt, 1) == 0); // no found
diff --git a/src/evicted_session_filter/evicted_session_filter.cpp b/src/evicted_session_filter/evicted_session_filter.cpp
index feebcc3..8a11bc6 100644
--- a/src/evicted_session_filter/evicted_session_filter.cpp
+++ b/src/evicted_session_filter/evicted_session_filter.cpp
@@ -8,73 +8,22 @@
 
 struct evicted_session_filter
 {
-    uint8_t enable;
     struct expiry_dablooms_handle *dablooms;
 };
 
-/******************************************************************************
- * Private API
- ******************************************************************************/
-
-static int check_options(const struct evicted_session_filter_options *opts)
-{
-    if (opts == NULL)
-    {
-        EVICTED_SESSION_FILTER_LOG_ERROR("invalid options");
-        return -1;
-    }
-
-    if (opts->enable == 0)
-    {
-        return 0;
-    }
-
-    // UINT32_MAX = 4294967295
-    if (opts->capacity == 0)
-    {
-        EVICTED_SESSION_FILTER_LOG_ERROR("invalid capacity: %u, supported range: [1, 4294967295]", opts->capacity);
-        return -1;
-    }
-
-    if (opts->timeout < 1 || opts->timeout > 60000)
-    {
-        EVICTED_SESSION_FILTER_LOG_ERROR("invalid timeout: %u, supported range: [1, 60000]", opts->timeout);
-        return -1;
-    }
-
-    if (opts->error_rate < 0.0 || opts->error_rate > 1.0)
-    {
-        EVICTED_SESSION_FILTER_LOG_ERROR("invalid error_rate: %f, supported range: [0.0, 1.0]", opts->error_rate);
-        return -1;
-    }
-
-    return 0;
-}
-
 /******************************************************************************
  * Public API
  ******************************************************************************/
 
-struct evicted_session_filter *evicted_session_filter_new(const struct evicted_session_filter_options *opts, uint64_t now)
+struct evicted_session_filter *evicted_session_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now)
 {
-    if (check_options(opts) == -1)
-    {
-        return NULL;
-    }
-
     struct evicted_session_filter *filter = (struct evicted_session_filter *)calloc(1, sizeof(struct evicted_session_filter));
     if (filter == NULL)
     {
         return NULL;
     }
 
-    filter->enable = opts->enable;
-    if (filter->enable == 0)
-    {
-        return filter;
-    }
-
-    filter->dablooms = expiry_dablooms_new(opts->capacity, opts->error_rate, now, opts->timeout);
+    filter->dablooms = expiry_dablooms_new(capacity, error_rate, now, timeout);
     if (filter->dablooms == NULL)
     {
         free(filter);
@@ -102,11 +51,6 @@ void evicted_session_filter_free(struct evicted_session_filter *filter)
 // reutrn 0: no found
 int evicted_session_filter_lookup(struct evicted_session_filter *filter, const struct tuple6 *key, uint64_t now)
 {
-    if (filter->enable == 0)
-    {
-        return 0;
-    }
-
     if (expiry_dablooms_search(filter->dablooms, (const char *)key, sizeof(struct tuple6), now) == 1)
     {
         return 1;
@@ -117,11 +61,6 @@ int evicted_session_filter_lookup(struct evicted_session_filter *filter, const s
 
 void evicted_session_filter_add(struct evicted_session_filter *filter, const struct tuple6 *key, uint64_t now)
 {
-    if (filter->enable == 0)
-    {
-        return;
-    }
-
     struct tuple6 reverse_key;
     tuple6_reverse(key, &reverse_key);
 
diff --git a/src/evicted_session_filter/evicted_session_filter.h b/src/evicted_session_filter/evicted_session_filter.h
index a80fd70..186e19a 100644
--- a/src/evicted_session_filter/evicted_session_filter.h
+++ b/src/evicted_session_filter/evicted_session_filter.h
@@ -11,15 +11,7 @@ extern "C"
 
 #define EVICTED_SESSION_FILTER_LOG_ERROR(format, ...) LOG_ERROR("evicted session filter", format, ##__VA_ARGS__)
 
-struct evicted_session_filter_options
-{
-    uint8_t enable;
-    uint32_t capacity; // range: [1, 4294967295] (UINT32_MAX = 4294967295)
-    uint32_t timeout;  // range: [1, 60000]
-    double error_rate; // range: [0.0, 1.0]
-};
-
-struct evicted_session_filter *evicted_session_filter_new(const struct evicted_session_filter_options *opts, uint64_t now);
+struct evicted_session_filter *evicted_session_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now);
 void evicted_session_filter_free(struct evicted_session_filter *filter);
 
 // return 1: found
diff --git a/src/evicted_session_filter/test/gtest_evicted_session_filter.cpp b/src/evicted_session_filter/test/gtest_evicted_session_filter.cpp
index 02b98fc..4ae721d 100644
--- a/src/evicted_session_filter/test/gtest_evicted_session_filter.cpp
+++ b/src/evicted_session_filter/test/gtest_evicted_session_filter.cpp
@@ -2,18 +2,15 @@
 
 #include "evicted_session_filter.h"
 
-struct evicted_session_filter_options opts = {
-    .enable = 1,
-    .capacity = 1000000,
-    .timeout = 2,
-    .error_rate = 0.00001,
-};
-
 TEST(EVICTED_SESSION_FILTER, TEST)
 {
     struct tuple6 c2s_key;
     struct tuple6 s2c_key;
 
+    uint32_t capacity = 1000000;
+    uint32_t timeout = 2;
+    double error_rate = 0.00001;
+
     memset(&c2s_key, 0, sizeof(c2s_key));
     c2s_key.ip_type = IP_TYPE_V4;
     c2s_key.src_addr.v4.s_addr = inet_addr("192.168.1.2");
@@ -32,7 +29,7 @@ TEST(EVICTED_SESSION_FILTER, TEST)
     s2c_key.ip_proto = 0x05;
     s2c_key.domain = 0x0606060606060606;
 
-    struct evicted_session_filter *filter = evicted_session_filter_new(&opts, 1);
+    struct evicted_session_filter *filter = evicted_session_filter_new(capacity, timeout, error_rate, 1);
     EXPECT_TRUE(filter != nullptr);
 
     EXPECT_TRUE(evicted_session_filter_lookup(filter, &c2s_key, 1) == 0); // no found
diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index 3345001..82edb81 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -15,18 +15,17 @@
 
 struct session_manager
 {
-     struct session_manager_options opts;
-
+     struct list_head evicte_queue;
      struct session_pool *sess_pool;
+     struct session_timer *sess_timer;
      struct session_table *tcp_sess_table;
      struct session_table *udp_sess_table;
-     struct session_timer *sess_timer;
-     struct list_head evicte_queue;
 
      struct duplicated_packet_filter *dup_pkt_filter;
      struct evicted_session_filter *evicte_sess_filter;
 
      struct session_manager_stat stat;
+     struct session_manager_options opts;
 };
 
 #define EVICTE_SESSION_BURST (RX_BURST_MAX)
@@ -40,6 +39,7 @@ int check_options(const struct session_manager_options *opts)
           return -1;
      }
 
+     // max session number
      if (opts->max_tcp_session_num < EVICTE_SESSION_BURST * 2)
      {
           SESSION_LOG_ERROR("invalid max_tcp_session_num: %lu, supported range: [%u, %lu]", opts->max_tcp_session_num, EVICTE_SESSION_BURST * 2, UINT64_MAX);
@@ -50,6 +50,10 @@ int check_options(const struct session_manager_options *opts)
           SESSION_LOG_ERROR("invalid max_udp_session_num: %lu, supported range: [%u, %lu]", opts->max_udp_session_num, EVICTE_SESSION_BURST * 2, UINT64_MAX);
           return -1;
      }
+
+     // session overload (skip)
+
+     // TCP timeout
      if (opts->tcp_init_timeout < 1 || opts->tcp_init_timeout > 60000)
      {
           SESSION_LOG_ERROR("invalid tcp_init_timeout: %lu, supported range: [1, 60000]", opts->tcp_init_timeout);
@@ -85,12 +89,70 @@ int check_options(const struct session_manager_options *opts)
           SESSION_LOG_ERROR("invalid tcp_unverified_rst_timeout: %lu, supported range: [1, 600000]", opts->tcp_unverified_rst_timeout);
           return -1;
      }
+     // UDP timeout
      if (opts->udp_data_timeout < 1 || opts->udp_data_timeout > 15999999000)
      {
           SESSION_LOG_ERROR("invalid udp_data_timeout: %lu, supported range: [1, 15999999000]", opts->udp_data_timeout);
           return -1;
      }
 
+     // duplicate packet filter
+     if (opts->duplicated_packet_filter_enable)
+     {
+          if (opts->duplicated_packet_filter_capacity == 0)
+          {
+               // UINT32_MAX = 4294967295
+               SESSION_LOG_ERROR("invalid duplicated_packet_filter_capacity: %u, supported range: [1, 4294967295]", opts->duplicated_packet_filter_capacity);
+               return -1;
+          }
+          if (opts->duplicated_packet_filter_timeout < 1 || opts->duplicated_packet_filter_timeout > 60000)
+          {
+               SESSION_LOG_ERROR("invalid duplicated_packet_filter_timeout: %u, supported range: [1, 60000]", opts->duplicated_packet_filter_timeout);
+               return -1;
+          }
+          if (opts->duplicated_packet_filter_error_rate < 0.0 || opts->duplicated_packet_filter_error_rate > 1.0)
+          {
+               SESSION_LOG_ERROR("invalid duplicated_packet_filter_error_rate: %f, supported range: [0.0, 1.0]", opts->duplicated_packet_filter_error_rate);
+               return -1;
+          }
+     }
+
+     // evicted session filter
+     if (opts->evicted_session_filter_enable)
+     {
+          if (opts->evicted_session_filter_capacity == 0)
+          {
+               // UINT32_MAX = 4294967295
+               SESSION_LOG_ERROR("invalid evicted_session_filter_capacity: %u, supported range: [1, 4294967295]", opts->evicted_session_filter_capacity);
+               return -1;
+          }
+          if (opts->evicted_session_filter_timeout < 1 || opts->evicted_session_filter_timeout > 60000)
+          {
+               SESSION_LOG_ERROR("invalid evicted_session_filter_timeout: %u, supported range: [1, 60000]", opts->evicted_session_filter_timeout);
+               return -1;
+          }
+          if (opts->evicted_session_filter_error_rate < 0.0 || opts->evicted_session_filter_error_rate > 1.0)
+          {
+               SESSION_LOG_ERROR("invalid evicted_session_filter_error_rate: %f, supported range: [0.0, 1.0]", opts->evicted_session_filter_error_rate);
+               return -1;
+          }
+     }
+
+     // TCP reassembly
+     if (opts->tcp_reassembly_enable)
+     {
+          if (opts->tcp_reassembly_max_timeout < 1 || opts->tcp_reassembly_max_timeout > 60000)
+          {
+               SESSION_LOG_ERROR("invalid tcp_reassembly_max_timeout: %u, supported range: [1, 60000]", opts->tcp_reassembly_max_timeout);
+               return -1;
+          }
+          if (opts->tcp_reassembly_max_segments < 2 || opts->tcp_reassembly_max_segments > 32)
+          {
+               SESSION_LOG_ERROR("invalid tcp_reassembly_max_segments: %u, supported range: [2, 32]", opts->tcp_reassembly_max_segments);
+               return -1;
+          }
+     }
+
      return 0;
 }
 
@@ -126,10 +188,11 @@ static int tcp_pcb_init(struct tcp_pcb *pcb, uint64_t max_timeout, uint64_t max_
      return 0;
 }
 
-static void tcp_half_update(struct tcp_half *half, const struct pkt_layer *tcp_layer, uint64_t now)
+static void tcp_pcb_update(struct tcp_pcb *pcb, enum session_dir dir, const struct pkt_layer *tcp_layer, uint64_t now)
 {
      struct tcp_segment *seg;
      struct tcphdr *hdr = (struct tcphdr *)tcp_layer->hdr_ptr;
+     struct tcp_half *half = (dir == SESSION_DIR_C2S) ? &pcb->c2s : &pcb->s2c;
      uint8_t flags = tcp_hdr_get_flags(hdr);
 
      half->flags |= flags;
@@ -351,7 +414,7 @@ static int session_manager_self_protection(struct session_manager *mgr, struct s
 // on pre new session
 static int session_manager_filter_evicted_session(struct session_manager *mgr, struct session *sess, const struct packet *pkt, const struct tuple6 *key, uint64_t now)
 {
-     if (evicted_session_filter_lookup(mgr->evicte_sess_filter, key, now))
+     if (mgr->opts.evicted_session_filter_enable && evicted_session_filter_lookup(mgr->evicte_sess_filter, key, now))
      {
           mgr->stat.evc_pkt.nr_pkts++;
           mgr->stat.evc_pkt.nr_bytes += packet_get_len(pkt);
@@ -364,6 +427,11 @@ static int session_manager_filter_evicted_session(struct session_manager *mgr, s
 // on pre update session
 static int session_manager_filter_duplicated_packet(struct session_manager *mgr, struct session *sess, const struct packet *pkt, const struct tuple6 *key, uint64_t now)
 {
+     if (mgr->opts.duplicated_packet_filter_enable == 0)
+     {
+          return 0;
+     }
+
      enum session_dir dir = identify_direction_by_history(sess, key);
      if ((dir == SESSION_DIR_C2S && session_get_metric(sess, SESSION_METRIC_C2S_PACKETS) < 3) ||
          (dir == SESSION_DIR_S2C && session_get_metric(sess, SESSION_METRIC_S2C_PACKETS) < 3) ||
@@ -501,7 +569,10 @@ static void session_manager_evicte_session(struct session_manager *mgr, struct s
           SESSION_LOG_DEBUG("evicte udp old session: %lu", session_get_id(sess));
           mgr->stat.udp_sess.nr_old_sess_evicted++;
           session_table_del(mgr->udp_sess_table, session_get_tuple(sess));
-          evicted_session_filter_add(mgr->evicte_sess_filter, session_get_tuple(sess), now);
+          if (mgr->opts.evicted_session_filter_enable)
+          {
+               evicted_session_filter_add(mgr->evicte_sess_filter, session_get_tuple(sess), now);
+          }
           break;
      default:
           assert(0);
@@ -542,8 +613,7 @@ static struct session *session_manager_new_tcp_session(struct session_manager *m
           session_pool_push(mgr->sess_pool, sess);
           return NULL;
      }
-     struct tcp_half *curr = (dir == SESSION_DIR_C2S) ? &sess->tcp_pcb.c2s : &sess->tcp_pcb.s2c;
-     tcp_half_update(curr, tcp_layer, now);
+     tcp_pcb_update(&sess->tcp_pcb, dir, tcp_layer, now);
 
      enum session_state next_state = session_transition_run(SESSION_STATE_INIT, TCP_SYN);
      session_update(sess, next_state, pkt, key, dir, now);
@@ -554,7 +624,12 @@ static struct session *session_manager_new_tcp_session(struct session_manager *m
      session_timer_update(mgr->sess_timer, sess, now + timeout);
      session_table_add(mgr->tcp_sess_table, key, sess);
 
-     duplicated_packet_filter_add(mgr->dup_pkt_filter, pkt, now);
+     uint64_t curr_dir_pkts = (dir == SESSION_DIR_C2S) ? session_get_metric(sess, SESSION_METRIC_C2S_PACKETS) : session_get_metric(sess, SESSION_METRIC_S2C_PACKETS);
+     if (curr_dir_pkts < 3 && mgr->opts.duplicated_packet_filter_enable)
+     {
+          duplicated_packet_filter_add(mgr->dup_pkt_filter, pkt, now);
+     }
+
      mgr->stat.tcp_sess.nr_sess_used++;
 
      return sess;
@@ -613,9 +688,12 @@ static int session_manager_update_tcp_session(struct session_manager *mgr, struc
      session_transition_log(sess, curr_state, next_state, inputs);
 
      // update tcp pcb
-     struct tcp_half *curr = (dir == SESSION_DIR_C2S) ? &sess->tcp_pcb.c2s : &sess->tcp_pcb.s2c;
-     struct tcp_half *peer = (dir == SESSION_DIR_C2S) ? &sess->tcp_pcb.s2c : &sess->tcp_pcb.c2s;
-     tcp_half_update(curr, tcp_layer, now);
+     tcp_pcb_update(&sess->tcp_pcb, dir, tcp_layer, now);
+
+     if (mgr->opts.duplicated_packet_filter_enable)
+     {
+          duplicated_packet_filter_add(mgr->dup_pkt_filter, pkt, now);
+     }
 
      // set closing reason
      if (next_state == SESSION_STATE_CLOSING && !session_get_closing_reason(sess))
@@ -631,6 +709,8 @@ static int session_manager_update_tcp_session(struct session_manager *mgr, struc
      }
 
      // update timeout
+     struct tcp_half *curr = (dir == SESSION_DIR_C2S) ? &sess->tcp_pcb.c2s : &sess->tcp_pcb.s2c;
+     struct tcp_half *peer = (dir == SESSION_DIR_C2S) ? &sess->tcp_pcb.s2c : &sess->tcp_pcb.c2s;
      uint64_t timeout = 0;
      switch (next_state)
      {
@@ -704,34 +784,32 @@ struct session_manager *session_manager_new(struct session_manager_options *opts
      {
           return NULL;
      }
-
      memcpy(&mgr->opts, opts, sizeof(struct session_manager_options));
 
-     // duplicated packet filter
-     struct duplicated_packet_filter_options duplicated_packet_filter_opts = {
-         .enable = opts->duplicated_packet_filter_enable,
-         .capacity = opts->duplicated_packet_filter_capacity,
-         .timeout = opts->duplicated_packet_filter_timeout,
-         .error_rate = opts->duplicated_packet_filter_error_rate,
-     };
-     // evicted session filter
-     struct evicted_session_filter_options evicted_session_filter_opts = {
-         .enable = opts->evicted_session_filter_enable,
-         .capacity = opts->evicted_session_filter_capacity,
-         .timeout = opts->evicted_session_filter_timeout,
-         .error_rate = opts->evicted_session_filter_error_rate,
-     };
-
      mgr->sess_pool = session_pool_new(mgr->opts.max_tcp_session_num + mgr->opts.max_udp_session_num);
      mgr->tcp_sess_table = session_table_new();
      mgr->udp_sess_table = session_table_new();
      mgr->sess_timer = session_timer_new(now);
-     mgr->dup_pkt_filter = duplicated_packet_filter_new(&duplicated_packet_filter_opts, now);
-     mgr->evicte_sess_filter = evicted_session_filter_new(&evicted_session_filter_opts, now);
-     if (mgr->sess_pool == NULL || mgr->tcp_sess_table == NULL || mgr->udp_sess_table == NULL || mgr->sess_timer == NULL || mgr->dup_pkt_filter == NULL || mgr->evicte_sess_filter == NULL)
+     if (mgr->sess_pool == NULL || mgr->tcp_sess_table == NULL || mgr->udp_sess_table == NULL || mgr->sess_timer == NULL)
      {
           goto error;
      }
+     if (mgr->opts.evicted_session_filter_enable)
+     {
+          mgr->evicte_sess_filter = evicted_session_filter_new(mgr->opts.evicted_session_filter_capacity, mgr->opts.evicted_session_filter_timeout, mgr->opts.evicted_session_filter_error_rate, now);
+          if (mgr->evicte_sess_filter == NULL)
+          {
+               goto error;
+          }
+     }
+     if (mgr->opts.duplicated_packet_filter_enable)
+     {
+          mgr->dup_pkt_filter = duplicated_packet_filter_new(mgr->opts.duplicated_packet_filter_capacity, mgr->opts.duplicated_packet_filter_timeout, mgr->opts.duplicated_packet_filter_error_rate, now);
+          if (mgr->dup_pkt_filter == NULL)
+          {
+               goto error;
+          }
+     }
 
      INIT_LIST_HEAD(&mgr->evicte_queue);
      session_filter_init();
@@ -766,8 +844,14 @@ void session_manager_free(struct session_manager *mgr)
           {
                session_manager_free_session(mgr, sess);
           }
-          evicted_session_filter_free(mgr->evicte_sess_filter);
-          duplicated_packet_filter_free(mgr->dup_pkt_filter);
+          if (mgr->opts.evicted_session_filter_enable)
+          {
+               evicted_session_filter_free(mgr->evicte_sess_filter);
+          }
+          if (mgr->opts.duplicated_packet_filter_enable)
+          {
+               duplicated_packet_filter_free(mgr->dup_pkt_filter);
+          }
           session_timer_free(mgr->sess_timer);
           session_table_free(mgr->udp_sess_table);
           session_table_free(mgr->tcp_sess_table);
diff --git a/src/session/test/gtest_filter_tcp_dupkt.cpp b/src/session/test/gtest_filter_tcp_dupkt.cpp
index 8b87102..12b088f 100644
--- a/src/session/test/gtest_filter_tcp_dupkt.cpp
+++ b/src/session/test/gtest_filter_tcp_dupkt.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 static void packet_set_ip_id(struct packet *pkt, uint16_t ip_id)
diff --git a/src/session/test/gtest_overload_evict_tcp_sess.cpp b/src/session/test/gtest_overload_evict_tcp_sess.cpp
index 7b1ac57..3bb755f 100644
--- a/src/session/test/gtest_overload_evict_tcp_sess.cpp
+++ b/src/session/test/gtest_overload_evict_tcp_sess.cpp
@@ -44,7 +44,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 static void packet_set_tcp_src_addr(struct packet *pkt, uint32_t addr)
diff --git a/src/session/test/gtest_overload_evict_udp_sess.cpp b/src/session/test/gtest_overload_evict_udp_sess.cpp
index 4349376..c6b5ace 100644
--- a/src/session/test/gtest_overload_evict_udp_sess.cpp
+++ b/src/session/test/gtest_overload_evict_udp_sess.cpp
@@ -44,7 +44,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 static void packet_set_tcp_src_addr(struct packet *pkt, uint32_t addr)
diff --git a/src/session/test/gtest_state_tcp_active_to_closing.cpp b/src/session/test/gtest_state_tcp_active_to_closing.cpp
index 537e47c..5c000f7 100644
--- a/src/session/test/gtest_state_tcp_active_to_closing.cpp
+++ b/src/session/test/gtest_state_tcp_active_to_closing.cpp
@@ -43,7 +43,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 static void build_active_tcp_session(struct session_manager *mgr, struct session *sess)
diff --git a/src/session/test/gtest_state_tcp_init_to_opening.cpp b/src/session/test/gtest_state_tcp_init_to_opening.cpp
index ef55f33..7521a07 100644
--- a/src/session/test/gtest_state_tcp_init_to_opening.cpp
+++ b/src/session/test/gtest_state_tcp_init_to_opening.cpp
@@ -43,7 +43,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 /******************************************************************************
diff --git a/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp b/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp
index 86e989e..c6845e8 100644
--- a/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp
+++ b/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 #if 1
diff --git a/src/session/test/gtest_state_tcp_opening_to_active.cpp b/src/session/test/gtest_state_tcp_opening_to_active.cpp
index d7c50e3..534271e 100644
--- a/src/session/test/gtest_state_tcp_opening_to_active.cpp
+++ b/src/session/test/gtest_state_tcp_opening_to_active.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 /******************************************************************************
diff --git a/src/session/test/gtest_state_tcp_opening_to_closing.cpp b/src/session/test/gtest_state_tcp_opening_to_closing.cpp
index 27bf95f..271dbc3 100644
--- a/src/session/test/gtest_state_tcp_opening_to_closing.cpp
+++ b/src/session/test/gtest_state_tcp_opening_to_closing.cpp
@@ -43,7 +43,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 /******************************************************************************
diff --git a/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp b/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp
index f574a15..2e97440 100644
--- a/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp
+++ b/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 #if 1
diff --git a/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp b/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp
index 2eb1538..c538cc1 100644
--- a/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp
+++ b/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 /******************************************************************************
diff --git a/src/session/test/gtest_timeout_tcp_data.cpp b/src/session/test/gtest_timeout_tcp_data.cpp
index 3d93cf0..2f488c7 100644
--- a/src/session/test/gtest_timeout_tcp_data.cpp
+++ b/src/session/test/gtest_timeout_tcp_data.cpp
@@ -41,7 +41,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 #if 1
diff --git a/src/session/test/gtest_timeout_tcp_handshake.cpp b/src/session/test/gtest_timeout_tcp_handshake.cpp
index 5ccf110..b0518b6 100644
--- a/src/session/test/gtest_timeout_tcp_handshake.cpp
+++ b/src/session/test/gtest_timeout_tcp_handshake.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 #if 1
diff --git a/src/session/test/gtest_timeout_tcp_init.cpp b/src/session/test/gtest_timeout_tcp_init.cpp
index f5f830a..76896f7 100644
--- a/src/session/test/gtest_timeout_tcp_init.cpp
+++ b/src/session/test/gtest_timeout_tcp_init.cpp
@@ -42,7 +42,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 #if 1
diff --git a/src/session/test/gtest_timeout_udp_data.cpp b/src/session/test/gtest_timeout_udp_data.cpp
index ffb4bee..9dd571c 100644
--- a/src/session/test/gtest_timeout_udp_data.cpp
+++ b/src/session/test/gtest_timeout_udp_data.cpp
@@ -41,7 +41,7 @@ struct session_manager_options opts = {
     // TCP Reassembly
     .tcp_reassembly_enable = 1,
     .tcp_reassembly_max_timeout = 60000,
-    .tcp_reassembly_max_segments = 0,
+    .tcp_reassembly_max_segments = 16,
 };
 
 #if 1