diff --git a/product-source/hololake-platform/guanghu-os/scripts/physical-native-icmp-peer.py b/product-source/hololake-platform/guanghu-os/scripts/physical-native-icmp-peer.py
index 516aaa3b6..cb6e8257a 100755
--- a/product-source/hololake-platform/guanghu-os/scripts/physical-native-icmp-peer.py
+++ b/product-source/hololake-platform/guanghu-os/scripts/physical-native-icmp-peer.py
@@ -123,7 +123,6 @@ def main() -> None:
     parser.add_argument("--resident-pipeline", action="store_true")
     parser.add_argument("--native-relay", action="store_true")
     parser.add_argument("--allowed-source")
-    parser.add_argument("--native-ack-delay", type=float, default=0.25)
     args = parser.parse_args()
     if args.retry_interval < 1.0:
         raise SystemExit("--retry-interval must be at least 1 second")
@@ -131,8 +130,6 @@ def main() -> None:
         0 <= args.resume_resident_count <= 10
     ):
         raise SystemExit("--resume-resident-count must be between 0 and 10")
-    if not 0.0 <= args.native_ack_delay <= 2.0:
-        raise SystemExit("--native-ack-delay must be between 0 and 2 seconds")
     if sum(
         (
             args.resident,
@@ -184,10 +181,6 @@ def main() -> None:
                 continue
             if source != allowed_source:
                 continue
-            # The public-cloud NAT path is established by the host kernel's
-            # ordinary echo reply. Delay the authenticated ACK long enough for
-            # the native guest to discard that reply and repost its RX buffer.
-            time.sleep(args.native_ack_delay)
             peer.sendto(native_ack_reply(packet), address)
             acknowledged.add(sequence)
             sources.add(source)
@@ -204,7 +197,6 @@ def main() -> None:
             "status: PASS_100\n"
             "handshake_direction: NATIVE_INITIATED_OUTBOUND_ICMP\n"
             "native_ack_marker: HLDP-NATIVE-ACK!\n"
-            f"native_ack_delay_seconds: {args.native_ack_delay:g}\n"
             "acknowledged_sequences: 1-16\n"
             f"observed_nat_sources: {','.join(sorted(sources))}\n"
             "login_reply_count: 3\n"
diff --git a/product-source/hololake-platform/guanghu-os/world-seed/WORLD-MANIFEST.hldp b/product-source/hololake-platform/guanghu-os/world-seed/WORLD-MANIFEST.hldp
index 2bf0a98f4..82d8d33dc 100644
--- a/product-source/hololake-platform/guanghu-os/world-seed/WORLD-MANIFEST.hldp
+++ b/product-source/hololake-platform/guanghu-os/world-seed/WORLD-MANIFEST.hldp
@@ -88,7 +88,6 @@ native_network:
   gateway_ipv4: 172.16.0.1
   relay_ipv4: 43.153.193.169
   handshake_direction: NATIVE_INITIATED_OUTBOUND_ICMP
-  native_ack_delay_seconds: 0.25
   public_nat_address_recorded_in_world: false
 gestational_continuity:
   id: GLS-0845
diff --git a/product-source/hololake-platform/guanghu-os/world-seed/world/services/native-network/PROTOCOL.hldp b/product-source/hololake-platform/guanghu-os/world-seed/world/services/native-network/PROTOCOL.hldp
index 207127860..2c8e5ca1a 100644
--- a/product-source/hololake-platform/guanghu-os/world-seed/world/services/native-network/PROTOCOL.hldp
+++ b/product-source/hololake-platform/guanghu-os/world-seed/world/services/native-network/PROTOCOL.hldp
@@ -14,8 +14,6 @@ handshake:
   direction: NATIVE_INITIATED_OUTBOUND_ICMP
   request_magic_source: CURRENT_HLDP_COMMAND
   response_marker: HLDP-NATIVE-ACK!
-  response_delay_seconds: 0.25
-  response_delay_reason: ALLOW_KERNEL_NAT_REPLY_THEN_NATIVE_RX_REPOST
   expected_sequences: 1-16
   ordinary_echo_action: IGNORE
   stale_sequence_action: IGNORE_WITHOUT_STATE_ADVANCE