diff --git a/dockers/docker-dhcp-relay/cli-plugin-tests/test_show_dhcp6relay_counters.py b/dockers/docker-dhcp-relay/cli-plugin-tests/test_show_dhcp6relay_counters.py
index f640ef1de6..501309ddd4 100644
--- a/dockers/docker-dhcp-relay/cli-plugin-tests/test_show_dhcp6relay_counters.py
+++ b/dockers/docker-dhcp-relay/cli-plugin-tests/test_show_dhcp6relay_counters.py
@@ -20,6 +20,7 @@ except KeyError:
 expected_counts = """\
   Message Type     Vlan1000
 --------------  -----------
+       Unknown
        Solicit
      Advertise
        Request
diff --git a/dockers/docker-dhcp-relay/cli/show/plugins/show_dhcp_relay.py b/dockers/docker-dhcp-relay/cli/show/plugins/show_dhcp_relay.py
index bad1de7d52..ffcecaf601 100644
--- a/dockers/docker-dhcp-relay/cli/show/plugins/show_dhcp_relay.py
+++ b/dockers/docker-dhcp-relay/cli/show/plugins/show_dhcp_relay.py
@@ -12,7 +12,7 @@ from swsscommon.swsscommon import SonicV2Connector
 DHCPv6_COUNTER_TABLE = 'DHCPv6_COUNTER_TABLE'
 
 # DHCPv6 Counter Messages
-messages = ["Solicit", "Advertise", "Request", "Confirm", "Renew", "Rebind", "Reply", "Release", "Decline", "Relay-Forward", "Relay-Reply"]
+messages = ["Unknown", "Solicit", "Advertise", "Request", "Confirm", "Renew", "Rebind", "Reply", "Release", "Decline", "Relay-Forward", "Relay-Reply"]
 
 # DHCP_RELAY Config Table
 DHCP_RELAY = 'DHCP_RELAY'
diff --git a/src/dhcp6relay/src/relay.cpp b/src/dhcp6relay/src/relay.cpp
index 11bb4ace42..d8fa2747a5 100644
--- a/src/dhcp6relay/src/relay.cpp
+++ b/src/dhcp6relay/src/relay.cpp
@@ -49,7 +49,8 @@ const struct sock_fprog ether_relay_fprog = {
 
 /* DHCPv6 Counter */
 uint64_t counters[DHCPv6_MESSAGE_TYPE_COUNT];
-std::map<int, std::string> counterMap = {{1, "Solicit"},
+std::map<int, std::string> counterMap = {{0, "Unknown"},
+                                      {1, "Solicit"},
                                       {2, "Advertise"},
                                       {3, "Request"},
                                       {4, "Confirm"},
@@ -72,6 +73,7 @@ std::map<int, std::string> counterMap = {{1, "Solicit"},
  * @return              none
  */
 void initialize_counter(swss::DBConnector *db, std::string counterVlan) {
+    db->hset(counterVlan, "Unknown", toString(counters[DHCPv6_MESSAGE_TYPE_UNKNOWN]));
     db->hset(counterVlan, "Solicit", toString(counters[DHCPv6_MESSAGE_TYPE_SOLICIT]));
     db->hset(counterVlan, "Advertise", toString(counters[DHCPv6_MESSAGE_TYPE_ADVERTISE]));
     db->hset(counterVlan, "Request", toString(counters[DHCPv6_MESSAGE_TYPE_REQUEST]));
@@ -208,19 +210,26 @@ const struct dhcpv6_option *parse_dhcpv6_opt(const uint8_t *buffer, const uint8_
 }
 
 /**
- * @code                            void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n);
+ * @code                            void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n, relay_config *config, uint8_t msg_type);
  *
  * @brief                           send udp packet
  *
  * @param *buffer                   message buffer
  * @param sockaddr_in6 target       target socket
  * @param n                         length of message
+ * @param relay_config *config      pointer to relay_config
+ * @param uint8_t msg_type          message type of dhcpv6 option of relayed message
  * 
  * @return dhcpv6_option   end of dhcpv6 message option
  */
-void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n) {    
+void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n, relay_config *config, uint8_t msg_type) {
+    std::string counterVlan = counter_table;
     if(sendto(sock, buffer, n, 0, (const struct sockaddr *)&target, sizeof(target)) == -1)
         syslog(LOG_ERR, "sendto: Failed to send to target address\n");
+    else {
+        counters[msg_type]++;
+        update_counter(config->db, counterVlan.append(config->interface), msg_type);
+    }
 }
 
 /**
@@ -453,7 +462,7 @@ void relay_client(int sock, const uint8_t *msg, int32_t len, const ip6_hdr *ip_h
     current_buffer_position += dhcp_message_length + sizeof(dhcpv6_option);
 
     for(auto server: config->servers_sock) {
-        send_udp(sock, buffer, server, current_buffer_position - buffer);
+        send_udp(sock, buffer, server, current_buffer_position - buffer, config, new_message.msg_type);
     }
 }
 
@@ -471,6 +480,7 @@ void relay_client(int sock, const uint8_t *msg, int32_t len, const ip6_hdr *ip_h
  */
  void relay_relay_reply(int sock, const uint8_t *msg, int32_t len, relay_config *configs) {
     static uint8_t buffer[4096];
+    uint8_t type = 0;
     char ifname[configs->interface.size()];
     struct sockaddr_in6 target_addr;
     auto current_buffer_position = buffer;
@@ -479,6 +489,9 @@ void relay_client(int sock, const uint8_t *msg, int32_t len, const ip6_hdr *ip_h
     auto dhcp_relay_header = parse_dhcpv6_relay(msg);
     current_position += sizeof(struct dhcpv6_relay_msg);
     
+    auto position = current_position + sizeof(struct dhcpv6_option);
+    auto dhcpv6msg = parse_dhcpv6_hdr(position);
+
     while ((current_position - msg) != len) {
         auto option = parse_dhcpv6_opt(current_position, &tmp);
         current_position = tmp;
@@ -486,6 +499,7 @@ void relay_client(int sock, const uint8_t *msg, int32_t len, const ip6_hdr *ip_h
             case OPTION_RELAY_MSG:
                 memcpy(current_buffer_position, ((uint8_t *)option) + sizeof(struct dhcpv6_option), ntohs(option->option_length));
                 current_buffer_position += ntohs(option->option_length);
+                type = dhcpv6msg->msg_type;;
                 break;
             default:
                 break;
@@ -499,7 +513,7 @@ void relay_client(int sock, const uint8_t *msg, int32_t len, const ip6_hdr *ip_h
     target_addr.sin6_port = htons(CLIENT_PORT);
     target_addr.sin6_scope_id = if_nametoindex(ifname);
 
-    send_udp(sock, buffer, target_addr, current_buffer_position - buffer);
+    send_udp(sock, buffer, target_addr, current_buffer_position - buffer, configs, type);
 } 
 
 
diff --git a/src/dhcp6relay/src/relay.h b/src/dhcp6relay/src/relay.h
index 6be60697da..e50d39786b 100644
--- a/src/dhcp6relay/src/relay.h
+++ b/src/dhcp6relay/src/relay.h
@@ -25,6 +25,7 @@
 /* DHCPv6 message types */
 typedef enum
 {
+    DHCPv6_MESSAGE_TYPE_UNKNOWN = 0,
     DHCPv6_MESSAGE_TYPE_SOLICIT = 1,
     DHCPv6_MESSAGE_TYPE_ADVERTISE = 2,
     DHCPv6_MESSAGE_TYPE_REQUEST = 3,
@@ -321,15 +322,17 @@ const struct dhcpv6_relay_msg *parse_dhcpv6_relay(const uint8_t *buffer);
 const struct dhcpv6_option *parse_dhcpv6_opt(const uint8_t *buffer, const uint8_t **out_end);
 
 /**
- * @code                            void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n);
+ * @code                            void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n, relay_config *config, uint8_t msg_type);
  *
  * @brief                           send udp packet
  *
  * @param *buffer                   message buffer
  * @param sockaddr_in6 target       target socket
  * @param n                         length of message
+ * @param relay_config *config      pointer to relay_config
+ * @param uint8_t msg_type          message type of dhcpv6 option of relayed message
  * 
  * @return dhcpv6_option   end of dhcpv6 message option
  */
-void send_udp(int sock, struct sockaddr_in6 target, uint8_t *buffer, uint32_t n);
+void send_udp(int sock, uint8_t *buffer, struct sockaddr_in6 target, uint32_t n, relay_config *config, uint8_t msg_type);