diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..d8ae0c8
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "default-net"
+version = "0.1.0"
+authors = ["shellrow <81893184+shellrow@users.noreply.github.com>"]
+edition = "2018"
+repository = "https://github.com/shellrow/default-net"
+readme = "README.md"
+keywords = ["network"]
+categories = ["network-programming"]
+license = "MIT"
+
+[dependencies]
+pnet = "0.27"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..469c514
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,94 @@
+use std::net::UdpSocket;
+use pnet::transport::TransportChannelType::Layer4;
+use pnet::transport::TransportProtocol::Ipv4;
+use std::time;
+use std::time::{Duration, Instant};
+use std::net::IpAddr;
+//use pnet::packet::Packet;
+use pnet::transport::icmp_packet_iter;
+
+pub fn get_router_ip(){
+    let buf = [0u8; 0];
+    let socket = match UdpSocket::bind("0.0.0.0:0") {
+        Ok(s) => s,
+        Err(_) => panic!("error!"),
+    };
+    let dest: &str = "192.168.11.1:80";
+    socket.set_ttl(1).unwrap();
+    socket.send_to(&buf, dest).unwrap();
+    let protocol = Layer4(Ipv4(pnet::packet::ip::IpNextHeaderProtocols::Icmp));
+    let (mut _tx, mut rx) = match pnet::transport::transport_channel(4096, protocol) {
+        Ok((tx, rx)) => (tx, rx),
+        Err(e) => panic!("Error happened {}", e),
+    };
+    let timeout = Duration::from_millis(3000);
+    let router_ip = receive_icmp_packets(&mut rx, pnet::packet::icmp::IcmpTypes::TimeExceeded, &timeout);
+    match router_ip {
+        Ok(ip) => {println!("{}", ip)},
+        Err(e) => {println!("{}", e)},
+    }
+}
+
+#[cfg(any(unix, macos))]
+pub fn receive_icmp_packets(rx: &mut pnet::transport::TransportReceiver, icmp_type: pnet::packet::icmp::IcmpType, timeout: &Duration) -> Result<String, String>{
+    let mut iter = icmp_packet_iter(rx);
+    let start_time = Instant::now();
+    loop {
+        match iter.next_with_timeout(time::Duration::from_millis(100)) {
+            Ok(r) => {
+                if let Some((packet, addr)) = r {
+                    if packet.get_icmp_type() == icmp_type {
+                        match addr {
+                            IpAddr::V4(ipv4_addr) =>{return Ok(ipv4_addr.to_string())},
+                            IpAddr::V6(ipv6_addr) =>{return Ok(ipv6_addr.to_string())},
+                        }
+                    }
+                }else{
+                    return Err(String::from("Failed to read packet"));
+                }
+            },
+            Err(e) => {
+                return Err(format!("An error occurred while reading: {}", e));
+            }
+        }
+        if Instant::now().duration_since(start_time) > *timeout {
+            return Err(String::from("timeout"));
+        }
+    }
+}
+
+#[cfg(target_os = "windows")]
+pub fn receive_icmp_packets(rx: &mut pnet::transport::TransportReceiver, icmp_type: pnet::packet::icmp::IcmpType, timeout: &Duration) -> Result<String, String>{
+    let mut iter = icmp_packet_iter(rx);
+    let start_time = Instant::now();
+    loop {
+        match iter.next() {
+            Ok((packet, addr)) => {
+                if let Some((packet, addr)) = r {
+                    if packet.get_icmp_type() == icmp_type {
+                        match addr {
+                            IpAddr::V4(ipv4_addr) =>{return Ok(ipv4_addr.to_string())},
+                            IpAddr::V6(ipv6_addr) =>{return Ok(ipv6_addr.to_string())},
+                        }
+                    }
+                }else{
+                    return Err(String::from("Failed to read packet"));
+                }
+            },
+            Err(e) => {
+                return Err(format!("An error occurred while reading: {}", e));
+            }
+        }
+    }
+    if Instant::now().duration_since(start_time) > *timeout {
+        return Err(String::from("timeout"));
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}