diff --git a/ClientTester/EchoClientTester/DummyService/DummyClientService.cs b/ClientTester/EchoClientTester/DummyService/DummyClientService.cs
index 0c40ac8..400938f 100644
--- a/ClientTester/EchoClientTester/DummyService/DummyClientService.cs
+++ b/ClientTester/EchoClientTester/DummyService/DummyClientService.cs
@@ -100,12 +100,9 @@ public class DummyClientService
     {
         int totalSent = 0, totalRecv = 0;
         int connected = 0;
-        int rttClientCount = 0;
 
         Log.Information("───────────── Performance Report ─────────────");
 
-        double totalAvgRtt = 0;
-
         foreach (DummyClients c in clients)
         {
             NetStatistics? stats = c.peer?.Statistics;
@@ -113,16 +110,11 @@ public class DummyClientService
             float lossPct = stats?.PacketLossPercent ?? 0f;
 
             Log.Information(
-                "[Client {ClientId:00}] Sent={Sent} Recv={Recv} | Loss={Loss}({LossPct:F1}%) AvgRTT={AvgRtt:F3}ms LastRTT={LastRtt:F3}ms",
-                c.clientId, c.SentCount, c.ReceivedCount, loss, lossPct, c.AvgRttMs, c.LastRttMs);
+                "[Client {ClientId:00}] Sent={Sent} Recv={Recv} | Loss={Loss}({LossPct:F1}%)",
+                c.clientId, c.SentCount, c.ReceivedCount, loss, lossPct);
 
             totalSent += c.SentCount;
             totalRecv += c.ReceivedCount;
-            if (c.RttCount > 0)
-            {
-                totalAvgRtt += c.AvgRttMs;
-                rttClientCount++;
-            }
 
             if (c.peer != null)
             {
@@ -130,12 +122,10 @@ public class DummyClientService
             }
         }
 
-        double avgRtt = rttClientCount > 0 ? totalAvgRtt / rttClientCount : 0;
-
         Log.Information("────────────────────────────────────────────");
         Log.Information(
-            "[TOTAL] Sent={Sent} Recv={Recv} Connected={Connected}/{Total} AvgRTT={AvgRtt:F3}ms",
-            totalSent, totalRecv, connected, clients.Count, avgRtt);
+            "[TOTAL] Sent={Sent} Recv={Recv} Connected={Connected}/{Total}",
+            totalSent, totalRecv, connected, clients.Count);
         Log.Information("────────────────────────────────────────────");
     }
 
diff --git a/ClientTester/EchoClientTester/DummyService/DummyClients.cs b/ClientTester/EchoClientTester/DummyService/DummyClients.cs
index 1a4adeb..ff01e3e 100644
--- a/ClientTester/EchoClientTester/DummyService/DummyClients.cs
+++ b/ClientTester/EchoClientTester/DummyService/DummyClients.cs
@@ -1,4 +1,3 @@
-using System.Collections.Concurrent;
 using System.Diagnostics;
 using ClientTester.Packet;
 using LiteNetLib;
@@ -13,12 +12,7 @@ public class DummyClients
     private EventBasedNetListener listener;
     private NetDataWriter? writer;
     public NetPeer? peer;
-    public long clientId;
-
-    // seq → 송신 타임스탬프 (Stopwatch tick)
-    private ConcurrentDictionary<int, long> pendingPings = new();
-    private int seqNumber;
-    private const int MAX_PENDING_PINGS = 1000;
+    public long clientId; // 일단 이게 hashKey가 됨 => 0 ~ 1000번까지는 더미용응로 뺴둠
 
     // info
     private Vector3 position = new Vector3();
@@ -28,20 +22,12 @@ public class DummyClients
     private float preTime = 0.0f;
 
     // 이동 계산용
-    private static readonly Random random = new();
     private readonly Stopwatch moveClock = Stopwatch.StartNew();
     private float posX = 0f;
     private float posZ = 0f;
     private float dirX = 0f;
     private float dirZ = 0f;
 
-    // 유닛 테스트용 (0 = 제한 없음)
-    public int TestCount
-    {
-        get;
-        set;
-    } = 0;
-
     // 통계
     public int SentCount
     {
@@ -55,18 +41,6 @@ public class DummyClients
         get;
     }
 
-    public double LastRttMs
-    {
-        set;
-        get;
-    }
-
-    public double TotalRttMs
-    {
-        set;
-        get;
-    }
-
     public int RttCount
     {
         set;
@@ -86,11 +60,13 @@ public class DummyClients
             Log.Information("[Client {ClientId:00}] 연결됨", this.clientId);
 
             // clientID가 토큰의 hashKey라고 가정함
-            PacketHeader packetHeader = new PacketHeader();
-            packetHeader.Code = (PacketCode)1;
-            packetHeader.BodyLength = 4 + sizeof(long);
-            writer.Put(clientId);
+            AccTokenPacket recvTokenPacket = new AccTokenPacket();
+            recvTokenPacket.Token = clientId;
+
+            byte[] data = PacketSerializer.Serialize((ushort)PacketCode.ACC_TOKEN, recvTokenPacket);
+            writer.Put(data);
             peer.Send(writer, DeliveryMethod.ReliableOrdered);
+            writer.Reset();
         };
 
         listener.NetworkReceiveEvent += (peer, reader, channel, deliveryMethod) =>
@@ -98,25 +74,13 @@ public class DummyClients
             short code = reader.GetShort();
             short bodyLength = reader.GetShort();
             string? msg = reader.GetString();
-            long sentTick;
 
-            if (msg != null && msg.StartsWith("Echo seq:") &&
-                int.TryParse(msg.Substring("Echo seq:".Length), out int seq) &&
-                pendingPings.TryRemove(seq, out sentTick))
+            if (msg != null)
             {
-                double rttMs = (Stopwatch.GetTimestamp() - sentTick) * 1000.0 / Stopwatch.Frequency;
-                LastRttMs = rttMs;
-                TotalRttMs += rttMs;
                 RttCount++;
             }
 
             ReceivedCount++;
-
-            if (TestCount > 0 && ReceivedCount >= TestCount)
-            {
-                peer.Disconnect();
-            }
-
             reader.Recycle();
         };
 
@@ -141,13 +105,13 @@ public class DummyClients
         if (distance <= 0f)
         {
             // 현재 각도에서 -30~+30도 범위로 회전
-            rotY = (rotY + random.Next(-30, 31) + 360) % 360;
+            rotY = (rotY + Random.Shared.Next(-30, 31) + 360) % 360;
             float rad = rotY * MathF.PI / 180f;
             dirX = MathF.Sin(rad);
             dirZ = MathF.Cos(rad);
 
             // 3초~12초에 도달할 수 있는 거리 = moveSpeed × 랜덤 초
-            float seconds = 3f + (float)random.NextDouble() * 9f;
+            float seconds = 3f + (float)Random.Shared.NextDouble() * 9f;
             distance = moveSpeed * seconds;
         }
 
@@ -170,10 +134,6 @@ public class DummyClients
         }
 
         UpdateDummy();
-
-        int seq = seqNumber++;
-        pendingPings[seq] = Stopwatch.GetTimestamp();
-
         TransformPlayerPacket transformPlayerPacket = new TransformPlayerPacket
         {
             PlayerId = (int)clientId,
@@ -195,8 +155,6 @@ public class DummyClients
         writer.Reset();
     }
 
-    public double AvgRttMs => RttCount > 0 ? TotalRttMs / RttCount : 0.0;
-
     public void PollEvents()
     {
         manager.PollEvents();
diff --git a/ClientTester/EchoClientTester/EchoDummyService/EchoDummyClients.cs b/ClientTester/EchoClientTester/EchoDummyService/EchoDummyClients.cs
index 95caa4b..e809ef8 100644
--- a/ClientTester/EchoClientTester/EchoDummyService/EchoDummyClients.cs
+++ b/ClientTester/EchoClientTester/EchoDummyService/EchoDummyClients.cs
@@ -18,7 +18,7 @@ public class EchoDummyClients
     // seq → 송신 타임스탬프 (Stopwatch tick)
     private ConcurrentDictionary<int, long> pendingPings = new();
     private int seqNumber;
-    private const int MaxPendingPings = 1000;
+    private const int MAX_PENDING_PINGS = 1000;
 
     // 유닛 테스트용 (0 = 제한 없음)
     public int TestCount
@@ -119,13 +119,15 @@ public class EchoDummyClients
         pendingPings[seq] = Stopwatch.GetTimestamp();
 
         // 응답 없는 오래된 ping 정리 (패킷 유실 시 메모리 누수 방지)
-        if (pendingPings.Count > MaxPendingPings)
+        if (pendingPings.Count > MAX_PENDING_PINGS)
         {
-            int cutoff = seq - MaxPendingPings;
+            int cutoff = seq - MAX_PENDING_PINGS;
             foreach (int key in pendingPings.Keys)
             {
                 if (key < cutoff)
+                {
                     pendingPings.TryRemove(key, out _);
+                }
             }
         }
 
diff --git a/ClientTester/EchoClientTester/Packet/PacketBody.cs b/ClientTester/EchoClientTester/Packet/PacketBody.cs
index 677c00f..aed4292 100644
--- a/ClientTester/EchoClientTester/Packet/PacketBody.cs
+++ b/ClientTester/EchoClientTester/Packet/PacketBody.cs
@@ -104,12 +104,12 @@ public class PlayerInfo
 // 인증
 // ============================================================
 
-// RECV_TOKEN
+// ACC_TOKEN
 [ProtoContract]
-public class RecvTokenPacket
+public class AccTokenPacket
 {
     [ProtoMember(1)]
-    public string Token
+    public long Token
     {
         get;
         set;
diff --git a/ClientTester/EchoClientTester/Packet/PacketHeader.cs b/ClientTester/EchoClientTester/Packet/PacketHeader.cs
index fbe6ee6..ee28321 100644
--- a/ClientTester/EchoClientTester/Packet/PacketHeader.cs
+++ b/ClientTester/EchoClientTester/Packet/PacketHeader.cs
@@ -3,7 +3,7 @@ namespace ClientTester.Packet;
 public enum PacketCode : ushort
 {
     // 초기 클라이언트 시작시 jwt토큰 받아옴
-    RECV_TOKEN,
+    ACC_TOKEN = 1,
 
     // 내 정보 로드 (서버 -> 클라)
     LOAD_GAME,