diff --git a/Cargo.toml b/Cargo.toml
index 48f8492..36b77e7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,7 @@ thiserror = { version = "1.0", default-features = false }
 tracing = { version = "0.1", default-features = false, features = [
     "log",
 ], optional = true }
+rand = {version = "0.8.5", default-features = false, features = ["std","std_rng"] }
 
 [dev-dependencies]
 clap = { version = "4.5", features = ["derive"] }
@@ -35,6 +36,7 @@ tokio = { version = "1.36", features = [
     "rt-multi-thread",
 ], default-features = false }
 
+
 #tun2.rs example
 tun2 = { version = "1.2", features = ["async"] }
 
diff --git a/src/stream/tcb.rs b/src/stream/tcb.rs
index 4e5a8db..0e7383b 100644
--- a/src/stream/tcb.rs
+++ b/src/stream/tcb.rs
@@ -43,7 +43,10 @@ pub(super) struct Tcb {
 
 impl Tcb {
     pub(super) fn new(ack: u32, tcp_timeout: Duration) -> Tcb {
+        #[cfg(debug_assertions)]
         let seq = 100;
+        #[cfg(not(debug_assertions))]
+        let seq = rand::random::<u32>();
         let deadline = tokio::time::Instant::now() + tcp_timeout;
         Tcb {
             seq,