diff --git a/.gitignore b/.gitignore
index c7d8977..6362fb6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /target
-network_config/genesis.ssz
\ No newline at end of file
+network_config/genesis.ssz
+pcap/target
\ No newline at end of file
diff --git a/pcap/Cargo.lock b/pcap/Cargo.lock
new file mode 100644
index 0000000..d4628e1
--- /dev/null
+++ b/pcap/Cargo.lock
@@ -0,0 +1,284 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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diff --git a/pcap/Cargo.toml b/pcap/Cargo.toml
new file mode 100644
index 0000000..f6a3691
--- /dev/null
+++ b/pcap/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "bn-pcap"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+etherparse = "0.15.0"
+pcap = "2.1.0"
\ No newline at end of file
diff --git a/pcap/src/main.rs b/pcap/src/main.rs
new file mode 100644
index 0000000..dcaa506
--- /dev/null
+++ b/pcap/src/main.rs
@@ -0,0 +1,132 @@
+use std::net::{IpAddr, Ipv4Addr};
+use etherparse::{NetSlice, SlicedPacket, TransportSlice};
+use pcap::{Direction, Linktype, Packet};
+
+#[derive(Debug)]
+struct Addr {
+    ip: Ipv4Addr,
+    port: u16,
+}
+
+#[derive(Debug)]
+struct TcpDataInfo {
+    src: Addr,
+    dest: Addr,
+    data_offset: usize,
+    // flags: TcpMeta,
+    // ts: SystemTime,
+}
+
+// TODO: load private key
+// TODO: Noise decryption
+// https://github.com/sigp/lighthouse/blob/bcff4aa825c4d70a215e1f229a0d1798d697fb5b/beacon_node/lighthouse_network/src/service/utils.rs#L58
+// TODO: Use lighthouse codec
+fn main() {
+    // get the default Device
+    let device = pcap::Device::lookup()
+        .expect("device lookup failed")
+        .expect("no device available");
+    let local_addresses = device.addresses.iter().map(|addr| addr.addr).collect::<Vec<_>>();
+    println!("Using device {:?}", device);
+    println!("Local addresses {:?}", local_addresses);
+
+    // Setup Capture
+    let mut cap = pcap::Capture::from_device(device)
+        .unwrap()
+        .immediate_mode(true)
+        .open()
+        .unwrap();
+
+    cap.filter("tcp",  true).unwrap();
+    // cap.direction(Direction::In).unwrap();
+
+    let link_type = cap.get_datalink();
+    if !matches!(link_type, Linktype::ETHERNET) {
+        panic!("Unsupported link type: {link_type:?}");
+    }
+
+    let mut count = 0;
+    loop {
+        let packet = cap.next_packet().unwrap();
+        // println!("Got {:?}", packet.header);
+
+        let Some(tcp_data_info) = parse_tcp(&packet) else {
+            continue;
+        };
+
+        let data = &packet.data[tcp_data_info.data_offset..];
+        if data.len() > 0 {
+            print_tcp(tcp_data_info, data, &local_addresses);
+        } else {
+            println!("empty data.");
+            continue;
+        }
+
+        if count > 10 {
+            break;
+        }
+        count += 1;
+    }
+}
+
+fn parse_tcp(packet: &Packet) -> Option<TcpDataInfo> {
+    if packet.header.caplen < 32 {
+        return None;
+    }
+
+    let ipv4data = match skip_ethernet_header(packet.data) {
+        Ok(data) => data,
+        Err(e) => {
+            println!("error: {e}");
+            return None;
+        }
+    };
+
+    let sliced = SlicedPacket::from_ip(ipv4data).unwrap();
+    let Some(NetSlice::Ipv4(ipv4_slice)) = sliced.net else {
+        return None;
+    };
+    let src_addr = ipv4_slice.header().source_addr();
+    let dest_addr = ipv4_slice.header().destination_addr();
+
+    let TransportSlice::Tcp(tcp_slice) = sliced.transport.unwrap() else {
+        return None;
+    };
+    let src_port = tcp_slice.source_port();
+    let dest_port = tcp_slice.destination_port();
+
+    let link_bytes_len = 4;
+    let data_offset = link_bytes_len + ((ipv4_slice.header().ihl() * 4) + (tcp_slice.data_offset() * 4)) as usize;
+
+    Some(TcpDataInfo {
+        src: Addr {
+            ip: src_addr,
+            port: src_port,
+        },
+        dest: Addr {
+            ip: dest_addr,
+            port: dest_port,
+        },
+        data_offset,
+    })
+}
+
+fn skip_ethernet_header(data: &[u8]) -> Result<&[u8], String> {
+    if data.len() < 14 {
+        return Err("Packet too short".to_string());
+    }
+    Ok(&data[14..])
+}
+
+
+fn print_tcp(tcp_data_info: TcpDataInfo, data: &[u8], local_addresses: &Vec<IpAddr>) {
+    let is_sent = local_addresses.contains(&IpAddr::V4(tcp_data_info.src.ip));
+    println!(
+        "{} {}:{} -> {}:{}",
+        if is_sent { "sent" } else { "recv"},
+        tcp_data_info.src.ip,
+        tcp_data_info.src.port,
+        tcp_data_info.dest.ip,
+        tcp_data_info.dest.port,
+    );
+}