diff --git a/docker/routlin-dash/app/factory.py b/docker/routlin-dash/app/factory.py
index 068be29..423ec0a 100644
--- a/docker/routlin-dash/app/factory.py
+++ b/docker/routlin-dash/app/factory.py
@@ -775,18 +775,19 @@ def build_field(item, tokens):
     _vmask        = parse_validation(validate_raw) if validate_raw else 0
     validate_attr = f' data-validate="{_vmask}"' if _vmask else ''
     depends_attr  = f' data-depends="{e(",".join(depends))}"' if depends else ''
+    extra_attrs   = ''.join(f' {e(ak)}="{e(str(av))}"' for ak, av in item.get('attrs', {}).items())
     if _vmask:
         return (
             f'<div class="form-group"><label class="form-label">{label}</label>'
             f'<div class="field-wrap"><input type="{e(input_type)}" name="{name}" value="{e(value)}"'
-            f' placeholder="{placeholder}" class="form-input"{readonly}{validate_attr}{depends_attr}/>'
+            f' placeholder="{placeholder}" class="form-input"{readonly}{validate_attr}{depends_attr}{extra_attrs}/>'
             f'<p class="form-hint field-dyn-hint hidden"></p></div>'
             f'{hint_html}</div>'
         )
     return (
         f'<div class="form-group"><label class="form-label">{label}</label>'
         f'<input type="{e(input_type)}" name="{name}" value="{e(value)}"'
-        f' placeholder="{placeholder}" class="form-input"{readonly}{validate_attr}{depends_attr}/>'
+        f' placeholder="{placeholder}" class="form-input"{readonly}{validate_attr}{depends_attr}{extra_attrs}/>'
         f'{hint_html}</div>'
     )
 
diff --git a/docker/routlin-dash/app/pages/networklayout/action.py b/docker/routlin-dash/app/pages/networklayout/action.py
index 3e657b1..2f8267d 100644
--- a/docker/routlin-dash/app/pages/networklayout/action.py
+++ b/docker/routlin-dash/app/pages/networklayout/action.py
@@ -154,6 +154,36 @@ def addvlan_add():
         flash(f"'{dhcp_domain_raw}' is not a valid domain name.", 'error')
         return redirect(f'/{_PAGE}')
 
+    dhcp_pool_start = sanitize.ip(request.form.get('dhcp_pool_start', ''))
+    dhcp_pool_end   = sanitize.ip(request.form.get('dhcp_pool_end', ''))
+    if dhcp_pool_start and ipaddress.IPv4Address(dhcp_pool_start) not in _vlan_net:
+        flash(f"Pool start '{dhcp_pool_start}' is not in the VLAN subnet ({subnet}/{subnet_mask}).", 'error')
+        return redirect(f'/{_PAGE}')
+    if dhcp_pool_end and ipaddress.IPv4Address(dhcp_pool_end) not in _vlan_net:
+        flash(f"Pool end '{dhcp_pool_end}' is not in the VLAN subnet ({subnet}/{subnet_mask}).", 'error')
+        return redirect(f'/{_PAGE}')
+    if dhcp_pool_start and dhcp_pool_end:
+        if ipaddress.IPv4Address(dhcp_pool_start) > ipaddress.IPv4Address(dhcp_pool_end):
+            flash('Pool start must not be greater than pool end.', 'error')
+            return redirect(f'/{_PAGE}')
+
+    _lease_time_raw = request.form.get('dhcp_lease_time', '').strip()
+    _lease_unit_raw = request.form.get('dhcp_lease_unit', '').strip()
+    dhcp_lease_time = None
+    if _lease_time_raw:
+        try:
+            _lt = int(_lease_time_raw)
+            if _lt < 1:
+                raise ValueError
+        except ValueError:
+            flash('Lease time must be a positive integer.', 'error')
+            return redirect(f'/{_PAGE}')
+        _unit_suffix = {'minutes': 'm', 'hours': 'h', 'days': 'd'}.get(_lease_unit_raw)
+        if not _unit_suffix:
+            flash('Lease time unit must be minutes, hours, or days.', 'error')
+            return redirect(f'/{_PAGE}')
+        dhcp_lease_time = f'{_lt}{_unit_suffix}'
+
     cfg  = load_config()
     vlans = cfg.setdefault('vlans', [])
 
@@ -167,6 +197,12 @@ def addvlan_add():
     dhcp_info = {}
     if dhcp_domain and dhcp_domain != 'local':
         dhcp_info['domain'] = dhcp_domain
+    if dhcp_pool_start:
+        dhcp_info['dynamic_pool_start'] = dhcp_pool_start
+    if dhcp_pool_end:
+        dhcp_info['dynamic_pool_end'] = dhcp_pool_end
+    if dhcp_lease_time:
+        dhcp_info['lease_time'] = dhcp_lease_time
     dhcp_overrides = {}
     if new_stored_gw:
         dhcp_overrides['gateway'] = new_stored_gw
diff --git a/docker/routlin-dash/app/pages/networklayout/content.json b/docker/routlin-dash/app/pages/networklayout/content.json
index 32364ec..0644c89 100644
--- a/docker/routlin-dash/app/pages/networklayout/content.json
+++ b/docker/routlin-dash/app/pages/networklayout/content.json
@@ -257,14 +257,22 @@
                   "label": "DHCP Dynamic Pool Start",
                   "name": "dhcp_pool_start",
                   "input_type": "text",
-                  "placeholder": "e.g. 192.168.1.100"
+                  "validate": "VALIDATION_ADDRESS",
+                  "attrs": {
+                    "data-dep-subnet": "[name='subnet']",
+                    "data-dep-mask": ".subnet-prefix-input"
+                  }
                 },
                 {
                   "type": "field",
                   "label": "DHCP Dynamic Pool End",
                   "name": "dhcp_pool_end",
                   "input_type": "text",
-                  "placeholder": "e.g. 192.168.1.200"
+                  "validate": "VALIDATION_ADDRESS",
+                  "attrs": {
+                    "data-dep-subnet": "[name='subnet']",
+                    "data-dep-mask": ".subnet-prefix-input"
+                  }
                 },
                 {
                   "type": "field_row",