diff --git a/hw/super6502_fpga/src/sub/network_processor/sim/cocotb/tests/tcp_test.py b/hw/super6502_fpga/src/sub/network_processor/sim/cocotb/tests/tcp_test.py
index 676d4aa..5a3adbb 100644
--- a/hw/super6502_fpga/src/sub/network_processor/sim/cocotb/tests/tcp_test.py
+++ b/hw/super6502_fpga/src/sub/network_processor/sim/cocotb/tests/tcp_test.py
@@ -57,7 +57,7 @@ def ip_to_hex(ip: str) -> int:
 
 @cocotb.test()
 async def test_simple(dut):
-    pktdump = PcapWriter("tcp.pcapng", append=True, sync=True)
+    pktdump = PcapWriter("tcp.pcapng", append=False, sync=True)
 
 
     tb = TB(dut)
diff --git a/hw/super6502_fpga/src/sub/network_processor/src/network_processor.sv b/hw/super6502_fpga/src/sub/network_processor/src/network_processor.sv
index 896ebfc..4179be6 100644
--- a/hw/super6502_fpga/src/sub/network_processor/src/network_processor.sv
+++ b/hw/super6502_fpga/src/sub/network_processor/src/network_processor.sv
@@ -42,9 +42,6 @@ localparam AXIS_KEEP_WIDTH = ((AXIS_DATA_WIDTH+7)/8);
 axis_intf #(.DATA_WIDTH(MAC_DATA_WIDTH)) mac_tx_axis();
 axis_intf #(.DATA_WIDTH(MAC_DATA_WIDTH)) mac_rx_axis();
 
-ip_intf #(.DATA_WIDTH(MAC_DATA_WIDTH)) mac_tx_ip();
-ip_intf #(.DATA_WIDTH(MAC_DATA_WIDTH)) mac_rx_ip();
-
 eth_intf #(.DATA_WIDTH(MAC_DATA_WIDTH)) mac_tx_eth();
 eth_intf #(.DATA_WIDTH(MAC_DATA_WIDTH)) mac_rx_eth();
 
diff --git a/hw/super6502_fpga/src/sub/network_processor/src/tcp_packet_generator.sv b/hw/super6502_fpga/src/sub/network_processor/src/tcp_packet_generator.sv
index 38bf067..e8e534a 100644
--- a/hw/super6502_fpga/src/sub/network_processor/src/tcp_packet_generator.sv
+++ b/hw/super6502_fpga/src/sub/network_processor/src/tcp_packet_generator.sv
@@ -50,7 +50,7 @@ always_comb begin
                 m_ip.ip_hdr_valid   = '1;
                 m_ip.ip_dscp        = '0;
                 m_ip.ip_ecn         = '0;
-                m_ip.ip_length      = '0;
+                m_ip.ip_length      = 16'd40;
                 m_ip.ip_ttl         = '1;
                 m_ip.ip_protocol    = 8'h6;
                 m_ip.ip_source_ip   = i_src_ip;
@@ -78,7 +78,7 @@ always_comb begin
                 9:  m_ip.ip_payload_axis_tdata = i_ack_number[23:16];
                 10: m_ip.ip_payload_axis_tdata = i_ack_number[15:8];
                 11: m_ip.ip_payload_axis_tdata = i_ack_number[7:0];
-                12: m_ip.ip_payload_axis_tdata = '0;
+                12: m_ip.ip_payload_axis_tdata = {4'h5, 4'h0};
                 13: m_ip.ip_payload_axis_tdata = i_flags;
                 14: m_ip.ip_payload_axis_tdata = i_window_size[15:8];
                 15: m_ip.ip_payload_axis_tdata = i_window_size[7:0];
@@ -86,7 +86,7 @@ always_comb begin
                 17: m_ip.ip_payload_axis_tdata = checksum[7:0];
                 18: m_ip.ip_payload_axis_tdata = '0;
                 19: begin
-                    m_ip.ip_payload_axis_tdata = '0;
+                    m_ip.ip_payload_axis_tdata = '1;
                     m_ip.ip_payload_axis_tlast = '1;
                 end
             endcase