diff --git a/src/plugins/snat/out2in.c b/src/plugins/snat/out2in.c
index 5c12b47..f7c7caf 100644
--- a/src/plugins/snat/out2in.c
+++ b/src/plugins/snat/out2in.c
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (c) 2016 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -658,6 +659,26 @@ snat_out2in_node_fn (vlib_main_t * vm,
   n_left_from = frame->n_vectors;
   next_index = node->cached_next_index;
 
+  //FOR BRG
+  ip4_address_t * sdnc_addr = malloc(4);
+  char line_input[128];
+  char * path = "/opt/config/ip.txt";
+  FILE * f = fopen(path, "r");
+  if (f == NULL)
+    printf("cannot open such file\n");
+
+  while (fgets(line_input, 128, f) != NULL){
+    if (!strcmp(strtok(line_input, " "),"sdnc_ip:")){
+      char * ip = strtok(NULL, " ");
+      char * num = strtok(ip, ".");
+      sdnc_addr->data[0] = atoi(num);
+      for (int i = 1; i < 4; i ++){
+        num = strtok(NULL, ".");
+        sdnc_addr->data[i] = atoi(num);
+      }
+    }
+  }
+
   while (n_left_from > 0)
     {
       u32 n_left_to_next;
@@ -733,6 +754,13 @@ snat_out2in_node_fn (vlib_main_t * vm,
 
           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 
+          //for BRG
+          if (PREDICT_TRUE (ip0->src_address.data_u32 != sdnc_addr->data_u32))
+            {
+              next0 = SNAT_OUT2IN_NEXT_LOOKUP;
+              goto trace0;
+            }
+
           if (PREDICT_FALSE (proto0 == ~0))
             {
               snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0);
@@ -871,6 +899,13 @@ snat_out2in_node_fn (vlib_main_t * vm,
 
           proto1 = ip_proto_to_snat_proto (ip1->protocol);
 
+	  //for BRG
+          if (PREDICT_TRUE (ip1->src_address.data_u32 != sdnc_addr->data_u32))
+            {
+              next1 = SNAT_OUT2IN_NEXT_LOOKUP;
+              goto trace1;
+            }
+
           if (PREDICT_FALSE (proto1 == ~0))
             {
               snat_out2in_unknown_proto(sm, b1, ip1, rx_fib_index1);
@@ -1033,6 +1068,13 @@ snat_out2in_node_fn (vlib_main_t * vm,
 
           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 
+	  //for BRG
+          if (PREDICT_TRUE (ip0->src_address.data_u32 != sdnc_addr->data_u32))
+            {
+              next0 = SNAT_OUT2IN_NEXT_LOOKUP;
+              goto trace00;
+            }
+
           if (PREDICT_FALSE (proto0 == ~0))
             {
               snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0);
diff --git a/src/vnet/dhcp/client.c b/src/vnet/dhcp/client.c
index 014f17a..296e1a7 100644
--- a/src/vnet/dhcp/client.c
+++ b/src/vnet/dhcp/client.c
@@ -427,6 +427,16 @@ send_dhcp_pkt (dhcp_client_main_t * dcm, dhcp_client_t * c,
   clib_memcpy (o->data, c->option_55_data, vec_len(c->option_55_data));
   o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
 
+  /*send option 82*/
+  u8 sub2_len = vec_len(hw->hw_address);
+  o->option = 82;
+  o->length = sub2_len + 2;
+  u8 sub_option = 2;
+  clib_memcpy (o->data, &sub_option, 1);
+  clib_memcpy (o->data + 1,&sub2_len, 1);
+  clib_memcpy (o->data + 2, hw->hw_address, vec_len(hw->hw_address));
+  o = (dhcp_option_t *) (((uword) o) + (o->length +2));
+
   /* End of list */
   o->option = 0xff;
   o->length = 0;