diff --git a/tcp-test/client/src/main.rs b/tcp-test/client/src/main.rs
index 510e40f..0c97ada 100644
--- a/tcp-test/client/src/main.rs
+++ b/tcp-test/client/src/main.rs
@@ -1,6 +1,6 @@
 use std::{
     collections::VecDeque,
-    net::{Ipv4Addr, SocketAddr},
+    net::{Ipv4Addr, SocketAddr}, time::Duration,
 };
 
 use anyhow::anyhow;
@@ -8,7 +8,7 @@ use anyhow::anyhow;
 use log::{debug, info, trace};
 use nl_sys::{netlink, route};
 
-use packets::{self, EthernetPacket, IPv4Pkt, TCPPacket, TCPPkt};
+use packets::{self, EthernetPacket, IPv4Pkt, TCPPacket, TCPPacketBuilder, TCPPkt};
 use pcap_sys;
 
 struct PeerInfo {
@@ -30,6 +30,7 @@ struct TcpSocket {
     local_rx_last_ack: Option<u32>,
     state: TcpState,
     peer_info: Option<PeerInfo>,
+    ack_timeout: Option<Duration>
 }
 
 #[derive(Default)]
@@ -64,7 +65,7 @@ fn connect(
     remote_addr: Ipv4Addr,
     remote_port: u16,
     local_addr: Ipv4Addr,
-) -> anyhow::Result<TCPPacket> {
+) -> TCPPacket {
     socket.state = TcpState::SynSent;
     let local_port: u16 = loop {
         let port = rand::random();
@@ -79,10 +80,22 @@ fn connect(
         local_port,
     });
 
-    Ok(())
+    socket.local_seq_no = rand::random();
+
+    TCPPacketBuilder::default()
+        .srcport(local_port)
+        .dstport(remote_port)
+        .
+        .syn(true)
+        .window(64240)
+        .seqnumber(socket.local_seq_no)
+        .build(local_addr, remote_addr, vec![], None)
 }
 
-fn process_packet(socket: &mut TcpSocket, packet: TCPPkt<'_>) -> anyhow::Result<Option<TCPPacket>> {
+fn process_packet(
+    socket: &mut TcpSocket,
+    packet: TCPPkt<'_>,
+) -> anyhow::Result<Option<(TCPPacketBuilder, Vec<u8>)>> {
     match socket.state {
         TcpState::SynSent if packet.ack() && packet.syn() => {}
         _ => {}