diff --git a/ansible/inventory/host_vars/london-b.yml b/ansible/inventory/host_vars/london-b.yml
index 52d7d55..43356fc 100644
--- a/ansible/inventory/host_vars/london-b.yml
+++ b/ansible/inventory/host_vars/london-b.yml
@@ -33,4 +33,7 @@ common_ufw_allowed_ports:
   - { port: 32400, proto: tcp, comment: "Plex Media Server" }
   - { port: 6881, proto: tcp, comment: "BitTorrent" }
   - { port: 6881, proto: udp, comment: "BitTorrent" }
-  - { port: 445, proto: tcp, comment: "Samba" }
+  # SMB is reachable over Tailscale via the tailscale0 allow-all rule; this
+  # entry additionally allows the local London LAN. Deliberately NOT open to
+  # the public internet (see PESO-145).
+  - { port: 445, proto: tcp, from_ip: "192.168.1.0/24", comment: "Samba (LAN only)" }
diff --git a/ansible/roles/common/tasks/main.yml b/ansible/roles/common/tasks/main.yml
index 2751624..a088acd 100644
--- a/ansible/roles/common/tasks/main.yml
+++ b/ansible/roles/common/tasks/main.yml
@@ -99,6 +99,7 @@
     rule: allow
     port: "{{ item.port | string }}"
     proto: "{{ item.proto | default('tcp') }}"
+    from_ip: "{{ item.from_ip | default(omit) }}"
     comment: "{{ item.comment | default(omit) }}"
   loop: "{{ common_ufw_allowed_ports }}"
   when:
@@ -106,6 +107,21 @@
     - common_ufw_allowed_ports | length > 0
   notify: Reload ufw
 
+# When a port is restricted to a source (from_ip), make sure the older
+# unrestricted "allow from anywhere" variant of the same rule isn't left
+# lingering on the host — UFW keeps it otherwise, which would defeat the
+# source restriction. Deleting an absent rule is a no-op, so this is safe
+# on hosts that never had the broad rule.
+- name: Remove superseded world-open rules for source-restricted ports
+  community.general.ufw:
+    rule: allow
+    port: "{{ item.port | string }}"
+    proto: "{{ item.proto | default('tcp') }}"
+    delete: true
+  loop: "{{ common_ufw_allowed_ports | selectattr('from_ip', 'defined') | list }}"
+  when: common_ufw_enabled | bool
+  notify: Reload ufw
+
 - name: Enable UFW
   community.general.ufw:
     state: enabled