diff --git a/src/plugins/nat/nat44-ed/nat44_ed.c b/src/plugins/nat/nat44-ed/nat44_ed.c
index ed93f6c..133c39e 100644
--- a/src/plugins/nat/nat44-ed/nat44_ed.c
+++ b/src/plugins/nat/nat44-ed/nat44_ed.c
@@ -1633,19 +1633,19 @@
 
   vec_foreach (tsm, sm->per_thread_data)
     {
-      vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec)
-        {
-          if ((per_vrf_sessions->rx_fib_index == fib_index) ||
-              (per_vrf_sessions->tx_fib_index == fib_index))
-            {
-              per_vrf_sessions->expired = 1;
-            }
-        }
+      pool_foreach (per_vrf_sessions, tsm->per_vrf_sessions_pool)
+	{
+	  if ((per_vrf_sessions->rx_fib_index == fib_index) ||
+	      (per_vrf_sessions->tx_fib_index == fib_index))
+	    {
+	      per_vrf_sessions->expired = 1;
+	    }
+	}
     }
 }
 
 void
-update_per_vrf_sessions_vec (u32 fib_index, int is_del)
+update_per_vrf_sessions_pool (u32 fib_index, int is_del)
 {
   snat_main_t *sm = &snat_main;
   nat_fib_t *fib;
@@ -1788,7 +1788,7 @@
   fib_index =
     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
 
-  update_per_vrf_sessions_vec (fib_index, 0 /*is_del*/);
+  update_per_vrf_sessions_pool (fib_index, 0 /*is_del*/);
 
   if (!is_inside)
     {
@@ -1903,7 +1903,7 @@
   fib_index =
     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
 
-  update_per_vrf_sessions_vec (fib_index, 1 /*is_del*/);
+  update_per_vrf_sessions_pool (fib_index, 1 /*is_del*/);
 
   if (!is_inside)
     {
@@ -2002,7 +2002,7 @@
 
   fib_index =
     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
-  update_per_vrf_sessions_vec (fib_index, 0 /*is_del*/);
+  update_per_vrf_sessions_pool (fib_index, 0 /*is_del*/);
 
   outside_fib = nat44_ed_get_outside_fib (sm->outside_fibs, fib_index);
   if (outside_fib)
@@ -2092,7 +2092,7 @@
 
   fib_index =
     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
-  update_per_vrf_sessions_vec (fib_index, 1 /*is_del*/);
+  update_per_vrf_sessions_pool (fib_index, 1 /*is_del*/);
 
   outside_fib = nat44_ed_get_outside_fib (sm->outside_fibs, fib_index);
   if (outside_fib)
@@ -3287,7 +3287,7 @@
 {
   pool_free (tsm->lru_pool);
   pool_free (tsm->sessions);
-  vec_free (tsm->per_vrf_sessions_vec);
+  pool_free (tsm->per_vrf_sessions_pool);
 }
 
 void
diff --git a/src/plugins/nat/nat44-ed/nat44_ed.h b/src/plugins/nat/nat44-ed/nat44_ed.h
index bc69648..7065114 100644
--- a/src/plugins/nat/nat44-ed/nat44_ed.h
+++ b/src/plugins/nat/nat44-ed/nat44_ed.h
@@ -469,7 +469,7 @@
   /* real thread index */
   u32 thread_index;
 
-  per_vrf_sessions_t *per_vrf_sessions_vec;
+  per_vrf_sessions_t *per_vrf_sessions_pool;
 
 } snat_main_per_thread_data_t;
 
diff --git a/src/plugins/nat/nat44-ed/nat44_ed_inlines.h b/src/plugins/nat/nat44-ed/nat44_ed_inlines.h
index b99d152..04e5236 100644
--- a/src/plugins/nat/nat44-ed/nat44_ed_inlines.h
+++ b/src/plugins/nat/nat44-ed/nat44_ed_inlines.h
@@ -414,23 +414,16 @@
   per_vrf_sessions_t *per_vrf_sessions;
   u32 *to_free = 0, *i;
 
-  vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec)
+  pool_foreach (per_vrf_sessions, tsm->per_vrf_sessions_pool)
     {
-      if (per_vrf_sessions->expired)
-	{
-	  if (per_vrf_sessions->ses_count == 0)
-	    {
-	      vec_add1 (to_free, per_vrf_sessions - tsm->per_vrf_sessions_vec);
-	    }
-	}
+      if (per_vrf_sessions->expired && per_vrf_sessions->ses_count == 0)
+	vec_add1 (to_free, per_vrf_sessions - tsm->per_vrf_sessions_pool);
     }
 
-  if (vec_len (to_free))
+  vec_foreach (i, to_free)
     {
-      vec_foreach (i, to_free)
-	{
-	  vec_del1 (tsm->per_vrf_sessions_vec, *i);
-	}
+      per_vrf_sessions = pool_elt_at_index (tsm->per_vrf_sessions_pool, *i);
+      pool_put (tsm->per_vrf_sessions_pool, per_vrf_sessions);
     }
 
   vec_free (to_free);
@@ -449,7 +442,7 @@
 
   // s->per_vrf_sessions_index == ~0 ... reuse of old session
 
-  vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec)
+  pool_foreach (per_vrf_sessions, tsm->per_vrf_sessions_pool)
     {
       // ignore already expired registrations
       if (per_vrf_sessions->expired)
@@ -468,14 +461,13 @@
     }
 
   // create a new registration
-  vec_add2 (tsm->per_vrf_sessions_vec, per_vrf_sessions, 1);
+  pool_get (tsm->per_vrf_sessions_pool, per_vrf_sessions);
   clib_memset (per_vrf_sessions, 0, sizeof (*per_vrf_sessions));
-
   per_vrf_sessions->rx_fib_index = s->in2out.fib_index;
   per_vrf_sessions->tx_fib_index = s->out2in.fib_index;
 
 done:
-  s->per_vrf_sessions_index = per_vrf_sessions - tsm->per_vrf_sessions_vec;
+  s->per_vrf_sessions_index = per_vrf_sessions - tsm->per_vrf_sessions_pool;
   per_vrf_sessions->ses_count++;
 }
 
@@ -491,7 +483,7 @@
 
   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
   per_vrf_sessions =
-    vec_elt_at_index (tsm->per_vrf_sessions_vec, s->per_vrf_sessions_index);
+    pool_elt_at_index (tsm->per_vrf_sessions_pool, s->per_vrf_sessions_index);
 
   ASSERT (per_vrf_sessions->ses_count != 0);
 
@@ -511,7 +503,7 @@
 
   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
   per_vrf_sessions =
-    vec_elt_at_index (tsm->per_vrf_sessions_vec, s->per_vrf_sessions_index);
+    pool_elt_at_index (tsm->per_vrf_sessions_pool, s->per_vrf_sessions_index);
   return per_vrf_sessions->expired;
 }