diff --git a/.github/workflows/network-tests.yml b/.github/workflows/network-tests.yml
index 5f673e694..738a744cf 100644
--- a/.github/workflows/network-tests.yml
+++ b/.github/workflows/network-tests.yml
@@ -42,7 +42,7 @@ jobs:
         --packet-repeat-time 200
         --packet-interval 40
         --github-actions
-        --clients-count 2
+        --clients-count 1
         --packet-delay-log
 
     - name: Archive logs
@@ -52,6 +52,78 @@ jobs:
         path: Tests/KcpTests/KcpPerformanceTest/logs
         retention-days: 21
 
+  net-debug-direct-bytecheck-ubuntu:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '6.0.x'
+
+    - name: Restore NuGet packages
+      run: |
+        dotnet nuget add source https://apiint.nugettest.org/v3/index.json -n "nuget.org (Integration)"
+        dotnet restore Tests/KcpTests/KcpPerformanceTest/KcpPerformanceTest.csproj
+
+    - name: Run tests
+      run: >
+        cd Tests/KcpTests/KcpPerformanceTest ;
+        dotnet run --configuration Debug
+        --property:DefineConstants=TRACE%3bDEBUG%3bNET%3bNET6_0%3bNETCOREAPP%3bMIHOMO_KC%3bCONNECT_SERVERONLYP%3bBYTE_CHECK_MODE --
+        --packet-size 3500
+        --packet-repeat-time 200
+        --packet-interval 40
+        --github-actions
+        --clients-count 1
+        --packet-delay-log
+
+    - name: Archive logs
+      uses: actions/upload-artifact@v2
+      with:
+        name: Report & logs (direct-ubuntu-debug, BYTE_CHECK_MODE)
+        path: Tests/KcpTests/KcpPerformanceTest/logs
+        retention-days: 21
+
+  net-debug-direct-corrupt-bytecheck-ubuntu:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '6.0.x'
+
+    - name: Restore NuGet packages
+      run: |
+        dotnet nuget add source https://apiint.nugettest.org/v3/index.json -n "nuget.org (Integration)"
+        dotnet restore Tests/KcpTests/KcpPerformanceTest/KcpPerformanceTest.csproj
+
+    - name: Run tests
+      run: >
+        cd Tests/KcpTests/KcpPerformanceTest ;
+        dotnet run --configuration Debug
+        --property:DefineConstants=TRACE%3bDEBUG%3bNET%3bNET6_0%3bNETCOREAPP%3bMIHOMO_KCP%3bBYTE_CHECK_MODE%3bCONNECT_SERVERONLY%3bCORRUPT_PACKET --
+        --packet-size 3500
+        --packet-repeat-time 200
+        --packet-interval 40
+        --github-actions
+        --clients-count 1
+        --packet-delay-log
+
+    - name: Archive logs
+      uses: actions/upload-artifact@v2
+      with:
+        name: Report & logs (proxy-ubuntu-debug, BYTE_CHECK_MODE, CORRUPT_PACKET)
+        path: Tests/KcpTests/KcpPerformanceTest/logs
+        retention-days: 21
+
   net-debug-proxy-ubuntu:
     runs-on: ubuntu-latest
 
@@ -77,7 +149,7 @@ jobs:
         --packet-repeat-time 200
         --packet-interval 40
         --github-actions
-        --clients-count 2
+        --clients-count 1
         --packet-delay-log
 
     - name: Archive logs
@@ -113,7 +185,7 @@ jobs:
         --packet-repeat-time 200
         --packet-interval 40
         --github-actions
-        --clients-count 2
+        --clients-count 1
         --packet-delay-log
 
     - name: Archive logs
@@ -149,13 +221,13 @@ jobs:
         --packet-repeat-time 200
         --packet-interval 40
         --github-actions
-        --clients-count 2
+        --clients-count 1
         --packet-delay-log
 
     - name: Archive logs
       uses: actions/upload-artifact@v2
       with:
-        name: Report & logs (proxy-ubuntu-debug, BYTE_CHECK_MODE)
+        name: Report & logs (proxy-ubuntu-debug, BYTE_CHECK_MODE, CORRUPT_PACKET)
         path: Tests/KcpTests/KcpPerformanceTest/logs
         retention-days: 21
 
@@ -166,6 +238,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -207,6 +280,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -248,6 +322,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -288,6 +363,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -330,6 +406,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -371,6 +448,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -412,6 +490,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -453,6 +532,7 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
 
@@ -494,6 +574,8 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
+      - net-debug-direct-corrupt-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
       - net-debug-proxy-corrupt-bytecheck-ubuntu
@@ -536,6 +618,8 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
+      - net-debug-direct-corrupt-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
       - net-debug-proxy-corrupt-bytecheck-ubuntu
@@ -578,6 +662,8 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
+      - net-debug-direct-corrupt-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
       - net-debug-proxy-corrupt-bytecheck-ubuntu
@@ -620,6 +706,8 @@ jobs:
 
     needs:
       - net-debug-direct-ubuntu
+      - net-debug-direct-bytecheck-ubuntu
+      - net-debug-direct-corrupt-bytecheck-ubuntu
       - net-debug-proxy-ubuntu
       - net-debug-proxy-bytecheck-ubuntu
       - net-debug-proxy-corrupt-bytecheck-ubuntu
diff --git a/KCP/Kcp/KcpCore.cs b/KCP/Kcp/KcpCore.cs
index e59ac163c..e4341f043 100644
--- a/KCP/Kcp/KcpCore.cs
+++ b/KCP/Kcp/KcpCore.cs
@@ -1969,18 +1969,6 @@ ref length
                 switch (cmd)
                 {
                     case IKCP_CMD_PUSH:
-#if BYTE_CHECK_MODE
-                        if (!byteCheck(span.Slice(offset, (int)length), byteCheckMode, byteCheckCode))
-                        {
-                            if (CanLog(KcpLogMask.IKCP_LOG_IN_DATA))
-                            {
-                                LogWriteLine($"input psh dropped (checksum failed): sn={sn} ts={ts}", KcpLogMask.IKCP_LOG_IN_DATA.ToString());
-                            }
-                            offset += (int)length;
-                            continue;
-                        }
-                        break;
-#endif
                     case IKCP_CMD_ACK:
                     case IKCP_CMD_WASK:
                     case IKCP_CMD_WINS:
@@ -2049,6 +2037,17 @@ ref length
 
                     if (Itimediff(sn, rcv_nxt + rcv_wnd) < 0)
                     {
+#if BYTE_CHECK_MODE
+                        if (!byteCheck(span.Slice(offset, (int)length), byteCheckMode, byteCheckCode))
+                        {
+                            if (CanLog(KcpLogMask.IKCP_LOG_IN_DATA))
+                            {
+                                LogWriteLine($"input psh dropped (checksum failed): sn={sn} ts={ts}", KcpLogMask.IKCP_LOG_IN_DATA.ToString());
+                            }
+                            offset += (int)length;
+                            continue;
+                        }
+#endif
                         ///instead of ikcp_ack_push
                         acklist.Enqueue((sn, ts));
 
@@ -2320,10 +2319,10 @@ ref length
                             {
                                 LogWriteLine($"input psh dropped (checksum failed): sn={sn} ts={ts}", KcpLogMask.IKCP_LOG_IN_DATA.ToString());
                             }
+                            offset += (int)length;
                             continue;
                         }
 #endif
-
                         ///instead of ikcp_ack_push
                         acklist.Enqueue((sn, ts));
 
diff --git a/KCP/Kcp/KcpSegment.cs b/KCP/Kcp/KcpSegment.cs
index 6bb8e85b0..1c3e8a9e4 100644
--- a/KCP/Kcp/KcpSegment.cs
+++ b/KCP/Kcp/KcpSegment.cs
@@ -623,7 +623,15 @@ public Span<byte> data
         private void CorruptData(Span<byte> buffer)
         {
             if (buffer.Length == 0 || !corrupt) return;
-            if (xmit >= 2 || sn <= 500) return;
+            if (sn <= 500) return;
+            if (xmit < 2)
+            {
+                Log.Verb($"Packet sn={sn}: corrupted packet", nameof(KcpSegment));
+            }
+            else
+            {
+                Log.Verb($"Packet sn={sn}: normal packet", nameof(KcpSegment));
+            }
             lock (Random.Shared)
             {
                 buffer[Random.Shared.Next(0, buffer.Length)] = 0;
diff --git a/Tests/KcpTests/SharedLib/KCP/SpecialUdp/SocketUdpClient.cs b/Tests/KcpTests/SharedLib/KCP/SpecialUdp/SocketUdpClient.cs
index 0b52ab6e1..26c4850c1 100644
--- a/Tests/KcpTests/SharedLib/KCP/SpecialUdp/SocketUdpClient.cs
+++ b/Tests/KcpTests/SharedLib/KCP/SpecialUdp/SocketUdpClient.cs
@@ -1,6 +1,6 @@
 // #define SOCKET_UDP_VERBOSE
 // #define SOCKET_UDP_PACKET_CONTENT_VERBOSE
-// #define SOCKET_UDP_PACKET_CONTENT_VERBOSE_SYNCRONOUS
+#define SOCKET_UDP_PACKET_CONTENT_VERBOSE_SYNCRONOUS
 
 // Generated by ChatGPT
 using System.Net;