diff --git a/libraries/io/eth/tb/vhdl/tb_eth_tester_pkg.vhd b/libraries/io/eth/tb/vhdl/tb_eth_tester_pkg.vhd
index 2f443c90cc2964521e3422a6f6a9fc335a58edfb..9944c99cc36839ec843daa0ece9a3b2d1ca04c9b 100644
--- a/libraries/io/eth/tb/vhdl/tb_eth_tester_pkg.vhd
+++ b/libraries/io/eth/tb/vhdl/tb_eth_tester_pkg.vhd
@@ -31,6 +31,7 @@ USE common_lib.common_pkg.ALL;
 USE common_lib.common_mem_pkg.ALL;
 USE common_lib.common_field_pkg.ALL;
 USE common_lib.common_network_layers_pkg.ALL;
+USE work.eth_tester_pkg.ALL;
 
 PACKAGE tb_eth_tester_pkg is
 
@@ -42,6 +43,9 @@ PACKAGE tb_eth_tester_pkg is
   FUNCTION func_eth_tester_gn_index_to_mac_15_0(gn_index : NATURAL) RETURN STD_LOGIC_VECTOR;
   FUNCTION func_eth_tester_gn_index_to_ip_15_0(gn_index : NATURAL) RETURN STD_LOGIC_VECTOR;
 
+  -- Ethernet packet length in octets inclduing eth header and CRC
+  FUNCTION func_eth_tester_eth_packet_length(block_len : NATURAL) RETURN NATURAL;
+
 END tb_eth_tester_pkg;
 
 
@@ -63,5 +67,14 @@ PACKAGE BODY tb_eth_tester_pkg IS
     RETURN c_ip_15_0;
   END func_eth_tester_gn_index_to_ip_15_0;
 
+  FUNCTION func_eth_tester_eth_packet_length(block_len : NATURAL) RETURN NATURAL IS
+    CONSTANT c_app_len : NATURAL := c_eth_tester_app_hdr_len + block_len;
+    CONSTANT c_udp_len : NATURAL := c_network_udp_header_len + c_app_len;
+    CONSTANT c_ip_len  : NATURAL := c_network_ip_header_len + c_udp_len;
+    CONSTANT c_eth_len : NATURAL := c_network_eth_header_len + c_ip_len + c_network_eth_crc_len;
+  BEGIN
+    RETURN c_eth_len;
+  END func_eth_tester_eth_packet_length;
+
 END tb_eth_tester_pkg;