diff --git a/src/bin/client-demo.rs b/src/bin/client-demo.rs
index a8a226f54..e19341d79 100644
--- a/src/bin/client-demo.rs
+++ b/src/bin/client-demo.rs
@@ -235,7 +235,14 @@ fn spy_node(client_addr: &Arc<RwLock<SocketAddr>>) -> (ReplicatedData, UdpSocket
     addr.set_port(port + 1);
     let daddr = "0.0.0.0:0".parse().unwrap();
     let pubkey = KeyPair::new().pubkey();
-    let node = ReplicatedData::new(pubkey, gossip.local_addr().unwrap(), daddr, daddr, daddr);
+    let node = ReplicatedData::new(
+        pubkey,
+        gossip.local_addr().unwrap(),
+        daddr,
+        daddr,
+        daddr,
+        daddr,
+    );
     (node, gossip)
 }
 
diff --git a/src/bin/fullnode.rs b/src/bin/fullnode.rs
index ee445428b..8741b6a4f 100644
--- a/src/bin/fullnode.rs
+++ b/src/bin/fullnode.rs
@@ -129,6 +129,7 @@ fn main() {
             UdpSocket::bind("0.0.0.0:0").unwrap(),
             UdpSocket::bind(repl_data.replicate_addr).unwrap(),
             UdpSocket::bind(repl_data.gossip_addr).unwrap(),
+            UdpSocket::bind(repl_data.repair_addr).unwrap(),
             leader,
             exit.clone(),
         );
diff --git a/src/crdt.rs b/src/crdt.rs
index 7c2d7e494..e4ba429c1 100644
--- a/src/crdt.rs
+++ b/src/crdt.rs
@@ -77,6 +77,9 @@ pub struct ReplicatedData {
     pub requests_addr: SocketAddr,
     /// transactions address
     pub transactions_addr: SocketAddr,
+    /// repair address, we use this to jump ahead of the packets
+    /// destined to the replciate_addr
+    pub repair_addr: SocketAddr,
     /// current leader identity
     pub current_leader_id: PublicKey,
     /// last verified hash that was submitted to the leader
@@ -92,6 +95,7 @@ impl ReplicatedData {
         replicate_addr: SocketAddr,
         requests_addr: SocketAddr,
         transactions_addr: SocketAddr,
+        repair_addr: SocketAddr,
     ) -> ReplicatedData {
         ReplicatedData {
             id,
@@ -101,6 +105,7 @@ impl ReplicatedData {
             replicate_addr,
             requests_addr,
             transactions_addr,
+            repair_addr,
             current_leader_id: PublicKey::default(),
             last_verified_hash: Hash::default(),
             last_verified_count: 0,
@@ -118,6 +123,7 @@ impl ReplicatedData {
         let gossip_addr = Self::next_port(&bind_addr, 1);
         let replicate_addr = Self::next_port(&bind_addr, 2);
         let requests_addr = Self::next_port(&bind_addr, 3);
+        let repair_addr = Self::next_port(&bind_addr, 4);
         let pubkey = KeyPair::new().pubkey();
         ReplicatedData::new(
             pubkey,
@@ -125,6 +131,7 @@ impl ReplicatedData {
             replicate_addr,
             requests_addr,
             transactions_addr,
+            repair_addr,
         )
     }
 }
@@ -390,7 +397,7 @@ impl Crdt {
         let daddr = "0.0.0.0:0".parse().unwrap();
         let valid: Vec<_> = self.table
             .values()
-            .filter(|r| r.id != self.me && r.replicate_addr != daddr)
+            .filter(|r| r.id != self.me && r.repair_addr != daddr)
             .collect();
         if valid.is_empty() {
             return Err(Error::CrdtTooSmall);
@@ -509,7 +516,7 @@ impl Crdt {
                     let sz = rblob.meta.size;
                     outblob.meta.size = sz;
                     outblob.data[..sz].copy_from_slice(&rblob.data[..sz]);
-                    outblob.meta.set_addr(&from.replicate_addr);
+                    outblob.meta.set_addr(&from.repair_addr);
                     //TODO, set the sender id to the requester so we dont retransmit
                     //come up with a cleaner solution for this when sender signatures are checked
                     outblob.set_id(from.id).expect("blob set_id");
@@ -518,7 +525,7 @@ impl Crdt {
             }
         } else {
             assert!(window.read().unwrap()[pos].is_none());
-            info!("failed RequestWindowIndex {} {}", ix, from.replicate_addr);
+            info!("failed RequestWindowIndex {} {}", ix, from.repair_addr);
         }
         None
     }
@@ -580,10 +587,10 @@ impl Crdt {
                 trace!(
                     "received RequestWindowIndex {} {} myaddr {}",
                     ix,
-                    from.replicate_addr,
-                    me.replicate_addr
+                    from.repair_addr,
+                    me.repair_addr
                 );
-                assert_ne!(from.replicate_addr, me.replicate_addr);
+                assert_ne!(from.repair_addr, me.repair_addr);
                 Self::run_window_request(&window, &from, ix, blob_recycler)
             }
             Err(_) => {
@@ -656,6 +663,7 @@ pub struct Sockets {
     pub transaction: UdpSocket,
     pub respond: UdpSocket,
     pub broadcast: UdpSocket,
+    pub repair: UdpSocket,
 }
 
 pub struct TestNode {
@@ -672,6 +680,7 @@ impl TestNode {
         let replicate = UdpSocket::bind("0.0.0.0:0").unwrap();
         let respond = UdpSocket::bind("0.0.0.0:0").unwrap();
         let broadcast = UdpSocket::bind("0.0.0.0:0").unwrap();
+        let repair = UdpSocket::bind("0.0.0.0:0").unwrap();
         let pubkey = KeyPair::new().pubkey();
         let data = ReplicatedData::new(
             pubkey,
@@ -679,6 +688,7 @@ impl TestNode {
             replicate.local_addr().unwrap(),
             requests.local_addr().unwrap(),
             transaction.local_addr().unwrap(),
+            repair.local_addr().unwrap(),
         );
         TestNode {
             data: data,
@@ -690,6 +700,7 @@ impl TestNode {
                 transaction,
                 respond,
                 broadcast,
+                repair,
             },
         }
     }
@@ -698,6 +709,7 @@ impl TestNode {
 #[cfg(test)]
 mod tests {
     use crdt::{parse_port_or_addr, Crdt, ReplicatedData};
+    use result::Error;
     use signature::{KeyPair, KeyPairUtil};
 
     #[test]
@@ -719,6 +731,7 @@ mod tests {
             "127.0.0.1:1235".parse().unwrap(),
             "127.0.0.1:1236".parse().unwrap(),
             "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
         );
         assert_eq!(d.version, 0);
         let mut crdt = Crdt::new(d.clone());
@@ -736,6 +749,15 @@ mod tests {
         copy
     }
     #[test]
+    fn replicated_data_new_leader() {
+        let d1 = ReplicatedData::new_leader(&"127.0.0.1:1234".parse().unwrap());
+        assert_eq!(d1.gossip_addr, "127.0.0.1:1235".parse().unwrap());
+        assert_eq!(d1.replicate_addr, "127.0.0.1:1236".parse().unwrap());
+        assert_eq!(d1.requests_addr, "127.0.0.1:1237".parse().unwrap());
+        assert_eq!(d1.transactions_addr, "127.0.0.1:1234".parse().unwrap());
+        assert_eq!(d1.repair_addr, "127.0.0.1:1238".parse().unwrap());
+    }
+    #[test]
     fn update_test() {
         let d1 = ReplicatedData::new(
             KeyPair::new().pubkey(),
@@ -743,6 +765,7 @@ mod tests {
             "127.0.0.1:1235".parse().unwrap(),
             "127.0.0.1:1236".parse().unwrap(),
             "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
         );
         let d2 = ReplicatedData::new(
             KeyPair::new().pubkey(),
@@ -750,6 +773,7 @@ mod tests {
             "127.0.0.1:1235".parse().unwrap(),
             "127.0.0.1:1236".parse().unwrap(),
             "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
         );
         let d3 = ReplicatedData::new(
             KeyPair::new().pubkey(),
@@ -757,6 +781,7 @@ mod tests {
             "127.0.0.1:1235".parse().unwrap(),
             "127.0.0.1:1236".parse().unwrap(),
             "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
         );
         let mut crdt = Crdt::new(d1.clone());
         let (key, ix, ups) = crdt.get_updates_since(0);
@@ -784,5 +809,65 @@ mod tests {
             sorted(&crdt.table.values().map(|x| x.clone()).collect())
         );
     }
+    /// Test that insert drops messages that are older
+    #[test]
+    fn window_index_request() {
+        let me = ReplicatedData::new(
+            KeyPair::new().pubkey(),
+            "127.0.0.1:1234".parse().unwrap(),
+            "127.0.0.1:1235".parse().unwrap(),
+            "127.0.0.1:1236".parse().unwrap(),
+            "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
+        );
+        let mut crdt = Crdt::new(me.clone());
+        let rv = crdt.window_index_request(0);
+        assert_matches!(rv, Err(Error::CrdtTooSmall));
+        let nxt = ReplicatedData::new(
+            KeyPair::new().pubkey(),
+            "127.0.0.1:1234".parse().unwrap(),
+            "127.0.0.1:1235".parse().unwrap(),
+            "127.0.0.1:1236".parse().unwrap(),
+            "127.0.0.1:1237".parse().unwrap(),
+            "0.0.0.0:0".parse().unwrap(),
+        );
+        crdt.insert(&nxt);
+        let rv = crdt.window_index_request(0);
+        assert_matches!(rv, Err(Error::CrdtTooSmall));
+        let nxt = ReplicatedData::new(
+            KeyPair::new().pubkey(),
+            "127.0.0.2:1234".parse().unwrap(),
+            "127.0.0.1:1235".parse().unwrap(),
+            "127.0.0.1:1236".parse().unwrap(),
+            "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
+        );
+        crdt.insert(&nxt);
+        let rv = crdt.window_index_request(0).unwrap();
+        assert_eq!(nxt.gossip_addr, "127.0.0.2:1234".parse().unwrap());
+        assert_eq!(rv.0, "127.0.0.2:1234".parse().unwrap());
 
+        let nxt = ReplicatedData::new(
+            KeyPair::new().pubkey(),
+            "127.0.0.3:1234".parse().unwrap(),
+            "127.0.0.1:1235".parse().unwrap(),
+            "127.0.0.1:1236".parse().unwrap(),
+            "127.0.0.1:1237".parse().unwrap(),
+            "127.0.0.1:1238".parse().unwrap(),
+        );
+        crdt.insert(&nxt);
+        let mut one = false;
+        let mut two = false;
+        while !one || !two {
+            //this randomly picks an option, so eventually it should pick both
+            let rv = crdt.window_index_request(0).unwrap();
+            if rv.0 == "127.0.0.2:1234".parse().unwrap() {
+                one = true;
+            }
+            if rv.0 == "127.0.0.3:1234".parse().unwrap() {
+                two = true;
+            }
+        }
+        assert!(one && two);
+    }
 }
diff --git a/src/server.rs b/src/server.rs
index bc42164f7..525a65026 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -79,6 +79,7 @@ impl Server {
         respond_socket: UdpSocket,
         replicate_socket: UdpSocket,
         gossip_socket: UdpSocket,
+        repair_socket: UdpSocket,
         leader_repl_data: ReplicatedData,
         exit: Arc<AtomicBool>,
     ) -> Self {
@@ -91,6 +92,7 @@ impl Server {
             me,
             gossip_socket,
             replicate_socket,
+            repair_socket,
             leader_repl_data,
             exit.clone(),
         );
@@ -98,3 +100,34 @@ impl Server {
         Server { thread_hdls }
     }
 }
+#[cfg(test)]
+mod tests {
+    use bank::Bank;
+    use crdt::TestNode;
+    use mint::Mint;
+    use server::Server;
+    use std::sync::atomic::{AtomicBool, Ordering};
+    use std::sync::Arc;
+    #[test]
+    fn validator_exit() {
+        let tn = TestNode::new();
+        let alice = Mint::new(10_000);
+        let bank = Bank::new(&alice);
+        let exit = Arc::new(AtomicBool::new(false));
+        let v = Server::new_validator(
+            bank,
+            tn.data.clone(),
+            tn.sockets.requests,
+            tn.sockets.respond,
+            tn.sockets.replicate,
+            tn.sockets.gossip,
+            tn.sockets.repair,
+            tn.data,
+            exit.clone(),
+        );
+        exit.store(true, Ordering::Relaxed);
+        for t in v.thread_hdls {
+            t.join().unwrap();
+        }
+    }
+}
diff --git a/src/streamer.rs b/src/streamer.rs
index 2b8899a80..5019651f2 100644
--- a/src/streamer.rs
+++ b/src/streamer.rs
@@ -602,10 +602,8 @@ mod bench {
 
 #[cfg(test)]
 mod test {
-    use crdt::{Crdt, ReplicatedData};
+    use crdt::{Crdt, TestNode};
     use packet::{Blob, BlobRecycler, Packet, PacketRecycler, Packets, PACKET_DATA_SIZE};
-    use signature::KeyPair;
-    use signature::KeyPairUtil;
     use std::collections::VecDeque;
     use std::io;
     use std::io::Write;
@@ -688,29 +686,21 @@ mod test {
 
     #[test]
     pub fn window_send_test() {
-        let pubkey_me = KeyPair::new().pubkey();
-        let read = UdpSocket::bind("127.0.0.1:0").expect("bind");
-        let addr = read.local_addr().unwrap();
-        let send = UdpSocket::bind("127.0.0.1:0").expect("bind");
-        let serve = UdpSocket::bind("127.0.0.1:0").expect("bind");
-        let transaction = UdpSocket::bind("127.0.0.1:0").expect("bind");
+        let tn = TestNode::new();
         let exit = Arc::new(AtomicBool::new(false));
-        let rep_data = ReplicatedData::new(
-            pubkey_me,
-            read.local_addr().unwrap(),
-            send.local_addr().unwrap(),
-            serve.local_addr().unwrap(),
-            transaction.local_addr().unwrap(),
-        );
-        let mut crdt_me = Crdt::new(rep_data);
+        let mut crdt_me = Crdt::new(tn.data.clone());
         let me_id = crdt_me.my_data().id;
         crdt_me.set_leader(me_id);
         let subs = Arc::new(RwLock::new(crdt_me));
 
         let resp_recycler = BlobRecycler::default();
         let (s_reader, r_reader) = channel();
-        let t_receiver =
-            blob_receiver(exit.clone(), resp_recycler.clone(), read, s_reader).unwrap();
+        let t_receiver = blob_receiver(
+            exit.clone(),
+            resp_recycler.clone(),
+            tn.sockets.gossip,
+            s_reader,
+        ).unwrap();
         let (s_window, r_window) = channel();
         let (s_retransmit, r_retransmit) = channel();
         let win = default_window();
@@ -724,7 +714,12 @@ mod test {
             s_retransmit,
         );
         let (s_responder, r_responder) = channel();
-        let t_responder = responder(send, exit.clone(), resp_recycler.clone(), r_responder);
+        let t_responder = responder(
+            tn.sockets.replicate,
+            exit.clone(),
+            resp_recycler.clone(),
+            r_responder,
+        );
         let mut msgs = VecDeque::new();
         for v in 0..10 {
             let i = 9 - v;
@@ -735,7 +730,7 @@ mod test {
             w.set_id(me_id).unwrap();
             assert_eq!(i, w.get_index().unwrap());
             w.meta.size = PACKET_DATA_SIZE;
-            w.meta.set_addr(&addr);
+            w.meta.set_addr(&tn.data.gossip_addr);
             msgs.push_back(b_);
         }
         s_responder.send(msgs).expect("send");
diff --git a/src/tvu.rs b/src/tvu.rs
index 79e8d08ff..a47b3658a 100644
--- a/src/tvu.rs
+++ b/src/tvu.rs
@@ -51,6 +51,7 @@ impl Tvu {
         me: ReplicatedData,
         gossip_listen_socket: UdpSocket,
         replicate: UdpSocket,
+        repair_socket: UdpSocket,
         leader: ReplicatedData,
         exit: Arc<AtomicBool>,
     ) -> Self {
@@ -96,6 +97,12 @@ impl Tvu {
             blob_recycler.clone(),
             retransmit_receiver,
         );
+        let t_repair_receiver = streamer::blob_receiver(
+            exit.clone(),
+            blob_recycler.clone(),
+            repair_socket,
+            blob_sender.clone(),
+        ).expect("tvu: blob repair receiver fail");
 
         //TODO
         //the packets coming out of blob_receiver need to be sent to the GPU and verified
@@ -122,6 +129,7 @@ impl Tvu {
             t_blob_receiver,
             t_retransmit,
             t_window,
+            t_repair_receiver,
             replicate_stage.thread_hdl,
         ];
         threads.extend(data_replicator.thread_hdls.into_iter());
@@ -218,6 +226,7 @@ pub mod tests {
             target1.data,
             target1.sockets.gossip,
             target1.sockets.replicate,
+            target1.sockets.repair,
             leader.data,
             exit.clone(),
         );
diff --git a/tests/multinode.rs b/tests/multinode.rs
index bf53fa734..b333a2888 100644
--- a/tests/multinode.rs
+++ b/tests/multinode.rs
@@ -37,6 +37,7 @@ fn validator(
         validator.sockets.respond,
         validator.sockets.replicate,
         validator.sockets.gossip,
+        validator.sockets.repair,
         leader.clone(),
         exit.clone(),
     );