rc: err, sorry, how long has this been wrong?

src/etc/inc/interfaces.inc

@@ -1254,8 +1254,10 @@ function interface_bring_down($interface = "wan", $destroy = false, $ifacecfg =
         mwexec("/sbin/pfctl -i " . escapeshellarg($realif) . " -Fs");
     }
 
-    @unlink("/var/db/{$interface}ip");
-    @unlink("/var/db/{$interface}ipv6");
+    @unlink("/var/db/{$interface}_ip");
+    @unlink("/var/db/{$interface}_ipv6");
+    @unlink("/var/db/{$interface}_cacheip");
+    @unlink("/var/db/{$interface}_cacheipv6");
     @unlink("/var/etc/nameserver_{$realif}");
     @unlink("/var/etc/nameserver_v6{$realif}");
     @unlink("/var/etc/searchdomain_{$realif}");

src/etc/rc.newwanipv6

@@ -78,8 +78,8 @@ if ((empty($ip) || !is_ipaddr($ip)) && substr($interface_real, 0, 4) != 'ovpn')
 
 $configip = $config['interfaces'][$interface]['ipaddrv6'];
 
-$searchdomain_file = "/var/etc/searchdomain_v6{$interface}";
-$nameserver_file = "/var/etc/nameserver_v6{$interface}";
+$searchdomain_file = "/var/etc/searchdomain_v6{$interface_real}";
+$nameserver_file = "/var/etc/nameserver_v6{$interface_real}";
 $cacheip_file = "/var/db/{$interface}_cacheipv6";
 $ip_file = "/var/db/{$interface}_ipv6";