Development

docker/routlin-dash/app/action_networklayout.py

@@ -208,6 +208,20 @@ def networklayout_tablevlans_edit():
     new_stored_gw = gateway_raw if (gateway_raw and gateway_raw != inferred_gw) else ''
     existing_gw   = existing.get('dhcp_information', {}).get('explicit_overrides', {}).get('gateway', '')
 
+    dns_override = 'dns_server_override' in request.form
+    dns_raw      = sanitize.ip(request.form.get('dns_server', ''))
+    if dns_override:
+        if not dns_raw:
+            flash('DNS server IP is required when override is enabled.', 'error')
+            return redirect(VIEW)
+        if dns_raw not in identity_ips:
+            flash(f"DNS server '{dns_raw}' must match one of the server identity IPs.", 'error')
+            return redirect(VIEW)
+    inferred_dns = (min(identity_ips, key=lambda ip: int(ip.split('.')[-1]))
+                    if identity_ips else '')
+    new_stored_dns = dns_raw if (dns_override and dns_raw and dns_raw != inferred_dns) else ''
+    existing_dns   = existing.get('dhcp_information', {}).get('explicit_overrides', {}).get('dns_server', '')
+
     _ids_unchanged = (
         len(new_identities) == len(old_identities) and
         all(
@@ -225,7 +239,8 @@ def networklayout_tablevlans_edit():
             and mdns_reflection     == bool(existing.get('mdns_reflection', False))
             and sorted(use_blocklists) == sorted(existing.get('use_blocklists', []))
             and _ids_unchanged
-            and new_stored_gw == existing_gw):
+            and new_stored_gw  == existing_gw
+            and new_stored_dns == existing_dns):
         flash('No changes were made.', 'info')
         return redirect(VIEW)
 
@@ -246,6 +261,10 @@ def networklayout_tablevlans_edit():
         dhcp_overrides['gateway'] = new_stored_gw
     else:
         dhcp_overrides.pop('gateway', None)
+    if new_stored_dns:
+        dhcp_overrides['dns_server'] = new_stored_dns
+    else:
+        dhcp_overrides.pop('dns_server', None)
     errors = validate.validate_config(cfg)
     if errors:
         for msg in errors:

docker/routlin-dash/app/view_page.py

@@ -325,6 +325,9 @@ def _config_datasource(name):
             row['server_identity_gateway'] = (
                 v.get('dhcp_information', {}).get('explicit_overrides', {}).get('gateway', '')
             )
+            row['server_identity_dns_server'] = (
+                v.get('dhcp_information', {}).get('explicit_overrides', {}).get('dns_server', '')
+            )
             rows.append(row)
         return rows
 

docker/routlin-dash/data/page_content.json

@@ -1588,7 +1588,8 @@
                   "pair_col2": "server_identity_hostnames",
                   "pair_label2": "Hostname (Opt)",
                   "pair_validate2": "networkname",
-                  "gateway_col": "server_identity_gateway"
+                  "gateway_col": "server_identity_gateway",
+                  "dns_col": "server_identity_dns_server"
                 },
                 {
                   "col": "radius_default",