-Undid my changes to the header as the design (no longer?) worked.

applications/compaan/designs/compaan_unb1_dp_offload/src/vhdl/compaan_unb1_dp_offload.vhd

@@ -116,7 +116,7 @@ ARCHITECTURE str OF compaan_unb1_dp_offload IS
                                                                                    ( field_name_pad("ip_version"         ), "  ",  4, field_default(4) ),
                                                                                    ( field_name_pad("ip_header_length"   ), "  ",  4, field_default(5) ),
                                                                                    ( field_name_pad("ip_services"        ), "  ",  8, field_default(0) ),
-                                                                                   ( field_name_pad("ip_total_length"    ), "  ", 16, field_default(80) ), --udp_total_length + 20
+                                                                                   ( field_name_pad("ip_total_length"    ), "  ", 16, field_default(0) ),
                                                                                    ( field_name_pad("ip_identification"  ), "  ", 16, field_default(0) ),
                                                                                    ( field_name_pad("ip_flags"           ), "  ",  3, field_default(2) ),
                                                                                    ( field_name_pad("ip_fragment_offset" ), "  ", 13, field_default(0) ),
@@ -127,7 +127,7 @@ ARCHITECTURE str OF compaan_unb1_dp_offload IS
                                                                                    ( field_name_pad("ip_dst_addr"        ), "  ", 32, field_default(0) ),
                                                                                    ( field_name_pad("udp_src_port"       ), "  ", 16, field_default(0) ), 
                                                                                    ( field_name_pad("udp_dst_port"       ), "  ", 16, field_default(0) ), 
-                                                                                   ( field_name_pad("udp_total_length"   ), "  ", 16, field_default(60) ), --usr header: 160b; payload: 10 words*32b=320b; total480b = 60B
+                                                                                   ( field_name_pad("udp_total_length"   ), "  ", 16, field_default(0) ),
                                                                                    ( field_name_pad("udp_checksum"       ), "  ", 16, field_default(0) ),
                                                                                    ( field_name_pad("usr_sync"           ), "  ",  1, field_default(1) ),
                                                                                    ( field_name_pad("usr_bsn"            ), "  ", 60, field_default(0) ),
@@ -139,7 +139,7 @@ ARCHITECTURE str OF compaan_unb1_dp_offload IS
                                                                                    ( field_name_pad("usr_hdr_field_5"    ), "  ",  8, field_default(0) ),
                                                                                    ( field_name_pad("usr_hdr_field_6"    ), "  ", 27, field_default(0) ) );
 
-  CONSTANT c_hdr_field_ovr_init         : STD_LOGIC_VECTOR(c_nof_hdr_fields-1 DOWNTO 0) := "1101"&"111111111101"&"0011"&"101111111";
+  CONSTANT c_hdr_field_ovr_init         : STD_LOGIC_VECTOR(c_nof_hdr_fields-1 DOWNTO 0) := "1101"&"111011111101"&"0001"&"101111111";
   
   CONSTANT c_fifo_size                  : NATURAL := 2*c_bg_block_size;