diff --git a/k8s/apps/amnezia/configmap-scripts.yaml b/k8s/apps/amnezia/configmap-scripts.yaml
index 3b8117f..297ed9f 100644
--- a/k8s/apps/amnezia/configmap-scripts.yaml
+++ b/k8s/apps/amnezia/configmap-scripts.yaml
@@ -10,12 +10,17 @@ data:
 
     PORT="${1:-5847}"
     VPN_CIDR="${2:-10.8.0.0/16}"
+    INPUT_CHAIN="AMNEZIAWG-INPUT"
+    FORWARD_CHAIN="AMNEZIAWG-FORWARD"
+    IPTABLES=(iptables -w 30)
 
     external_interface() {
       ip route get 1.1.1.1 | awk '{for (i=1;i<=NF;i++) if ($i=="dev") {print $(i+1); exit}}'
     }
 
-    ensure_insert_rule() {
+    ensure_rule() {
+      local mode="$1"
+      shift
       local table_args=()
       if [ "${1:-}" = "-t" ]; then
         table_args=("$1" "$2")
@@ -25,8 +30,8 @@ data:
       local chain="$1"
       shift
 
-      if ! iptables "${table_args[@]}" -C "${chain}" "$@" >/dev/null 2>&1; then
-        iptables "${table_args[@]}" -I "${chain}" 1 "$@"
+      if ! "${IPTABLES[@]}" "${table_args[@]}" -C "${chain}" "$@" >/dev/null 2>&1; then
+        "${IPTABLES[@]}" "${table_args[@]}" "${mode}" "${chain}" "$@"
       fi
     }
 
@@ -40,24 +45,15 @@ data:
       local chain="$1"
       shift
 
-      while iptables "${table_args[@]}" -D "${chain}" "$@" >/dev/null 2>&1; do
+      while "${IPTABLES[@]}" "${table_args[@]}" -D "${chain}" "$@" >/dev/null 2>&1; do
         true
       done
     }
 
-    ensure_append_rule() {
-      local table_args=()
-      if [ "${1:-}" = "-t" ]; then
-        table_args=("$1" "$2")
-        shift 2
-      fi
-
+    reset_chain() {
       local chain="$1"
-      shift
-
-      if ! iptables "${table_args[@]}" -C "${chain}" "$@" >/dev/null 2>&1; then
-        iptables "${table_args[@]}" -A "${chain}" "$@"
-      fi
+      "${IPTABLES[@]}" -N "${chain}" >/dev/null 2>&1 || true
+      "${IPTABLES[@]}" -F "${chain}"
     }
 
     EXT_IF="$(external_interface || true)"
@@ -71,13 +67,32 @@ data:
 
     sysctl -w net.ipv4.ip_forward=1
 
+    # Remove rules written by older revisions. In particular, the unqualified
+    # tailscale UDP DROP also blocks Flannel VXLAN (UDP/8472).
     delete_rule INPUT -i tailscale0 -p udp -m comment --comment amneziawg-block-tailscale -j DROP
-    ensure_insert_rule INPUT -i "${EXT_IF}" -p udp --dport "${PORT}" -m comment --comment amneziawg-allow-external -j ACCEPT
-    ensure_insert_rule INPUT -i tailscale0 -p udp --dport "${PORT}" -m comment --comment amneziawg-block-tailscale -j DROP
-    ensure_append_rule INPUT -i awg0 -m comment --comment amneziawg-awg-input -j ACCEPT
-    ensure_append_rule FORWARD -i awg0 -m comment --comment amneziawg-forward-in -j ACCEPT
-    ensure_append_rule FORWARD -o awg0 -m comment --comment amneziawg-forward-out -j ACCEPT
-    ensure_append_rule -t nat POSTROUTING -s "${VPN_CIDR}" -o "${EXT_IF}" -m comment --comment amneziawg-masquerade -j MASQUERADE
+    delete_rule INPUT -i "${EXT_IF}" -p udp -m comment --comment amneziawg-allow-external -j ACCEPT
+    delete_rule INPUT -i "${EXT_IF}" -p udp --dport "${PORT}" -m comment --comment amneziawg-allow-external -j ACCEPT
+    delete_rule INPUT -i tailscale0 -p udp --dport "${PORT}" -m comment --comment amneziawg-block-tailscale -j DROP
+    delete_rule INPUT -i awg0 -m comment --comment amneziawg-awg-input -j ACCEPT
+    delete_rule FORWARD -i awg0 -m comment --comment amneziawg-forward-in -j ACCEPT
+    delete_rule FORWARD -o awg0 -m comment --comment amneziawg-forward-out -j ACCEPT
+
+    reset_chain "${INPUT_CHAIN}"
+    "${IPTABLES[@]}" -A "${INPUT_CHAIN}" -i "${EXT_IF}" -p udp --dport "${PORT}" -m comment --comment amneziawg-allow-external -j ACCEPT
+    "${IPTABLES[@]}" -A "${INPUT_CHAIN}" -i tailscale0 -p udp --dport "${PORT}" -m comment --comment amneziawg-block-tailscale -j DROP
+    "${IPTABLES[@]}" -A "${INPUT_CHAIN}" -i awg0 -m comment --comment amneziawg-awg-input -j ACCEPT
+    "${IPTABLES[@]}" -A "${INPUT_CHAIN}" -j RETURN
+    ensure_rule -I INPUT -m comment --comment amneziawg-input-jump -j "${INPUT_CHAIN}"
+
+    reset_chain "${FORWARD_CHAIN}"
+    "${IPTABLES[@]}" -A "${FORWARD_CHAIN}" -i awg0 -m comment --comment amneziawg-forward-in -j ACCEPT
+    "${IPTABLES[@]}" -A "${FORWARD_CHAIN}" -o awg0 -m comment --comment amneziawg-forward-out -j ACCEPT
+    "${IPTABLES[@]}" -A "${FORWARD_CHAIN}" -j RETURN
+    ensure_rule -A FORWARD -m comment --comment amneziawg-forward-jump -j "${FORWARD_CHAIN}"
+
+    ensure_rule -A -t nat POSTROUTING -s "${VPN_CIDR}" -o "${EXT_IF}" -m comment --comment amneziawg-masquerade -j MASQUERADE
+
+    /scripts/firewall-check.sh "${PORT}" "${VPN_CIDR}"
 
   firewall-down.sh: |
     #!/usr/bin/env bash
@@ -85,6 +100,9 @@ data:
 
     PORT="${1:-5847}"
     VPN_CIDR="${2:-10.8.0.0/16}"
+    INPUT_CHAIN="AMNEZIAWG-INPUT"
+    FORWARD_CHAIN="AMNEZIAWG-FORWARD"
+    IPTABLES=(iptables -w 30)
 
     external_interface() {
       ip route get 1.1.1.1 | awk '{for (i=1;i<=NF;i++) if ($i=="dev") {print $(i+1); exit}}'
@@ -100,7 +118,7 @@ data:
       local chain="$1"
       shift
 
-      while iptables "${table_args[@]}" -D "${chain}" "$@" >/dev/null 2>&1; do
+      while "${IPTABLES[@]}" "${table_args[@]}" -D "${chain}" "$@" >/dev/null 2>&1; do
         true
       done
     }
@@ -111,6 +129,7 @@ data:
     fi
 
     if [ -n "${EXT_IF}" ]; then
+      delete_rule INPUT -i "${EXT_IF}" -p udp -m comment --comment amneziawg-allow-external -j ACCEPT
       delete_rule INPUT -i "${EXT_IF}" -p udp --dport "${PORT}" -m comment --comment amneziawg-allow-external -j ACCEPT
       delete_rule -t nat POSTROUTING -s "${VPN_CIDR}" -o "${EXT_IF}" -m comment --comment amneziawg-masquerade -j MASQUERADE
     fi
@@ -120,6 +139,57 @@ data:
     delete_rule INPUT -i awg0 -m comment --comment amneziawg-awg-input -j ACCEPT
     delete_rule FORWARD -i awg0 -m comment --comment amneziawg-forward-in -j ACCEPT
     delete_rule FORWARD -o awg0 -m comment --comment amneziawg-forward-out -j ACCEPT
+    delete_rule INPUT -m comment --comment amneziawg-input-jump -j "${INPUT_CHAIN}"
+    delete_rule FORWARD -m comment --comment amneziawg-forward-jump -j "${FORWARD_CHAIN}"
+
+    "${IPTABLES[@]}" -F "${INPUT_CHAIN}" >/dev/null 2>&1 || true
+    "${IPTABLES[@]}" -X "${INPUT_CHAIN}" >/dev/null 2>&1 || true
+    "${IPTABLES[@]}" -F "${FORWARD_CHAIN}" >/dev/null 2>&1 || true
+    "${IPTABLES[@]}" -X "${FORWARD_CHAIN}" >/dev/null 2>&1 || true
+
+  firewall-check.sh: |
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    PORT="${1:-5847}"
+    VPN_CIDR="${2:-10.8.0.0/16}"
+    INPUT_CHAIN="AMNEZIAWG-INPUT"
+    FORWARD_CHAIN="AMNEZIAWG-FORWARD"
+    IPTABLES=(iptables -w 5)
+
+    external_interface() {
+      ip route get 1.1.1.1 | awk '{for (i=1;i<=NF;i++) if ($i=="dev") {print $(i+1); exit}}'
+    }
+
+    EXT_IF="$(external_interface || true)"
+    if [ -z "${EXT_IF}" ]; then
+      EXT_IF="$(ip route show default | awk '{print $5; exit}')"
+    fi
+    if [ -z "${EXT_IF}" ]; then
+      echo "Unable to detect external interface" >&2
+      exit 1
+    fi
+
+    if "${IPTABLES[@]}" -C INPUT -i tailscale0 -p udp -m comment --comment amneziawg-block-tailscale -j DROP >/dev/null 2>&1; then
+      echo "Unsafe broad UDP DROP on tailscale0 is present" >&2
+      exit 1
+    fi
+    if "${IPTABLES[@]}" -C INPUT -i "${EXT_IF}" -p udp -m comment --comment amneziawg-allow-external -j ACCEPT >/dev/null 2>&1; then
+      echo "Unsafe broad UDP ACCEPT on ${EXT_IF} is present" >&2
+      exit 1
+    fi
+
+    "${IPTABLES[@]}" -C INPUT -m comment --comment amneziawg-input-jump -j "${INPUT_CHAIN}"
+    "${IPTABLES[@]}" -C "${INPUT_CHAIN}" -i "${EXT_IF}" -p udp --dport "${PORT}" -m comment --comment amneziawg-allow-external -j ACCEPT
+    "${IPTABLES[@]}" -C "${INPUT_CHAIN}" -i tailscale0 -p udp --dport "${PORT}" -m comment --comment amneziawg-block-tailscale -j DROP
+    "${IPTABLES[@]}" -C "${INPUT_CHAIN}" -i awg0 -m comment --comment amneziawg-awg-input -j ACCEPT
+
+    "${IPTABLES[@]}" -C FORWARD -m comment --comment amneziawg-forward-jump -j "${FORWARD_CHAIN}"
+    "${IPTABLES[@]}" -C "${FORWARD_CHAIN}" -i awg0 -m comment --comment amneziawg-forward-in -j ACCEPT
+    "${IPTABLES[@]}" -C "${FORWARD_CHAIN}" -o awg0 -m comment --comment amneziawg-forward-out -j ACCEPT
+
+    "${IPTABLES[@]}" -t nat -C POSTROUTING -s "${VPN_CIDR}" -o "${EXT_IF}" -m comment --comment amneziawg-masquerade -j MASQUERADE
+    awg show awg0 >/dev/null 2>&1
 
   run.sh: |
     #!/usr/bin/env bash
diff --git a/k8s/apps/amnezia/daemonset.yaml b/k8s/apps/amnezia/daemonset.yaml
index a536658..2a6414c 100644
--- a/k8s/apps/amnezia/daemonset.yaml
+++ b/k8s/apps/amnezia/daemonset.yaml
@@ -123,20 +123,20 @@ spec:
               command:
                 - /bin/bash
                 - -lc
-                - awg show awg0 >/dev/null 2>&1
+                - /scripts/firewall-check.sh 5847 10.8.0.0/16
             initialDelaySeconds: 5
             periodSeconds: 10
-            timeoutSeconds: 3
-            failureThreshold: 3
+            timeoutSeconds: 8
+            failureThreshold: 2
           livenessProbe:
             exec:
               command:
                 - /bin/bash
                 - -lc
-                - awg show awg0 >/dev/null 2>&1
+                - /scripts/firewall-check.sh 5847 10.8.0.0/16
             initialDelaySeconds: 30
             periodSeconds: 30
-            timeoutSeconds: 5
+            timeoutSeconds: 8
             failureThreshold: 3
           resources:
             requests: