diff --git a/modules/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js b/modules/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js
index f1e62c13db..8513e91d33 100644
--- a/modules/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js
+++ b/modules/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js
@@ -639,7 +639,7 @@ return view.extend({
 					so = ss.taboption('ipv6', form.Value, 'ra_maxinterval', _('Max <abbr title="Router Advertisement">RA</abbr> interval'), _('Maximum time allowed \
 						between sending unsolicited <abbr title="Router Advertisement, ICMPv6 Type 134">RA</abbr>. Default is 600 seconds (<code>600</code>).'));
 					so.optional = true;
-					so.default = '600';
+					so.placeholder = '600';
 					so.depends('ra', 'server');
 					so.depends('ra', 'hybrid');
 					so.depends('ra', 'relay');
@@ -648,7 +648,7 @@ return view.extend({
 					so = ss.taboption('ipv6', form.Value, 'ra_mininterval', _('Min <abbr title="Router Advertisement">RA</abbr> interval'), _('Minimum time allowed \
 						between sending unsolicited <abbr title="Router Advertisement, ICMPv6 Type 134">RA</abbr>. Default is 200 seconds (<code>200</code>).'));
 					so.optional = true;
-					so.default = '200';
+					so.placeholder = '200';
 					so.depends('ra', 'server');
 					so.depends('ra', 'hybrid');
 					so.depends('ra', 'relay');
@@ -657,7 +657,6 @@ return view.extend({
 						in <abbr title="Router Advertisement, ICMPv6 Type 134">RA</abbr> messages. Default is 1800 seconds (<code>1800</code>). \
 						Max 9000 seconds.'));
 					so.optional = true;
-					so.default = '1800';
 					so.depends('ra', 'server');
 					so.depends('ra', 'hybrid');
 					so.depends('ra', 'relay');
@@ -666,7 +665,6 @@ return view.extend({
 						to be published in <abbr title="Router Advertisement, ICMPv6 Type 134">RA</abbr> messages. Default is 0 (<code>0</code>).\
 						Min 1280.'));
 					so.optional = true;
-					so.default = '0';
 					so.depends('ra', 'server');
 					so.depends('ra', 'hybrid');
 					so.depends('ra', 'relay');
@@ -675,7 +673,6 @@ return view.extend({
 						to be published in <abbr title="Router Advertisement">RA</abbr> messages.<br />Default is 0 (<code>0</code>), meaning unspecified.\
 						Max 255.'));
 					so.optional = true;
-					so.default = '0';
 					so.depends('ra', 'server');
 					so.depends('ra', 'hybrid');
 					so.depends('ra', 'relay');
@@ -728,6 +725,7 @@ return view.extend({
 
 					so = ss.taboption('ipv6', form.Flag, 'ndproxy_routing', _('Learn routes from NDP'), _('Default is on.'));
 					so.default = '1';
+					so.optional = true;
 
 					so = ss.taboption('ipv6', form.Flag, 'ndproxy_slave', _('NDP-Proxy slave'), _('Set interface as NDP-Proxy external slave. Default is off.'));