diff --git a/src/vnet/ipsec/ipsec.c b/src/vnet/ipsec/ipsec.c
index 5cc8044..2749b04 100644
--- a/src/vnet/ipsec/ipsec.c
+++ b/src/vnet/ipsec/ipsec.c
@@ -31,6 +31,10 @@
  */
 #define IPSEC4_OUT_SPD_DEFAULT_HASH_NUM_BUCKETS (1 << 22)
 
+/* Flow cache is sized for 1 million flows with a load factor of .25.
+ */
+#define IPSEC4_SPD_DEFAULT_HASH_NUM_BUCKETS (1 << 22)
+
 ipsec_main_t ipsec_main;
 esp_async_post_next_t esp_encrypt_async_next;
 esp_async_post_next_t esp_decrypt_async_next;
@@ -554,12 +558,18 @@
   crypto_engine_backend_register_post_node (vm);
 
   im->ipsec4_out_spd_hash_tbl = NULL;
-  im->flow_cache_flag = 0;
+  im->output_flow_cache_flag = 0;
   im->ipsec4_out_spd_flow_cache_entries = 0;
   im->epoch_count = 0;
   im->ipsec4_out_spd_hash_num_buckets =
     IPSEC4_OUT_SPD_DEFAULT_HASH_NUM_BUCKETS;
 
+  im->ipsec4_in_spd_hash_tbl = NULL;
+  im->input_flow_cache_flag = 0;
+  im->ipsec4_in_spd_flow_cache_entries = 0;
+  im->input_epoch_count = 0;
+  im->ipsec4_in_spd_hash_num_buckets = IPSEC4_SPD_DEFAULT_HASH_NUM_BUCKETS;
+
   return 0;
 }
 
@@ -570,14 +580,16 @@
 {
   ipsec_main_t *im = &ipsec_main;
   unformat_input_t sub_input;
+
   u32 ipsec4_out_spd_hash_num_buckets;
+  u32 ipsec4_in_spd_hash_num_buckets;
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (input, "ipv4-outbound-spd-flow-cache on"))
-	im->flow_cache_flag = 1;
+	im->output_flow_cache_flag = 1;
       else if (unformat (input, "ipv4-outbound-spd-flow-cache off"))
-	im->flow_cache_flag = 0;
+	im->output_flow_cache_flag = 0;
       else if (unformat (input, "ipv4-outbound-spd-hash-buckets %d",
 			 &ipsec4_out_spd_hash_num_buckets))
 	{
@@ -585,6 +597,16 @@
 	  im->ipsec4_out_spd_hash_num_buckets =
 	    1ULL << max_log2 (ipsec4_out_spd_hash_num_buckets);
 	}
+      else if (unformat (input, "ipv4-inbound-spd-flow-cache on"))
+	im->input_flow_cache_flag = 1;
+      else if (unformat (input, "ipv4-inbound-spd-flow-cache off"))
+	im->input_flow_cache_flag = 0;
+      else if (unformat (input, "ipv4-inbound-spd-hash-buckets %d",
+			 &ipsec4_in_spd_hash_num_buckets))
+	{
+	  im->ipsec4_in_spd_hash_num_buckets =
+	    1ULL << max_log2 (ipsec4_in_spd_hash_num_buckets);
+	}
       else if (unformat (input, "ip4 %U", unformat_vlib_cli_sub_input,
 			 &sub_input))
 	{
@@ -623,11 +645,16 @@
 	return clib_error_return (0, "unknown input `%U'",
 				  format_unformat_error, input);
     }
-  if (im->flow_cache_flag)
+  if (im->output_flow_cache_flag)
     {
       vec_add2 (im->ipsec4_out_spd_hash_tbl, im->ipsec4_out_spd_hash_tbl,
 		im->ipsec4_out_spd_hash_num_buckets);
     }
+  if (im->input_flow_cache_flag)
+    {
+      vec_add2 (im->ipsec4_in_spd_hash_tbl, im->ipsec4_in_spd_hash_tbl,
+		im->ipsec4_in_spd_hash_num_buckets);
+    }
 
   return 0;
 }