diff --git a/install.py b/install.py
index 93305d5..7e68fd4 100755
--- a/install.py
+++ b/install.py
@@ -20,15 +20,20 @@ from glob import glob
 from ipaddress import IPv4Interface
 from configparser import ConfigParser
 from os.path import join, getmtime, exists, basename
-from utils import get_config
+from utils import get_config, ifname_mapping
 
 if os.geteuid() != 0:
     exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.")
 
 TOOLS = '/home/l_samenv/boxtools'
 
+BOX_TYPES = {
+   '00:0d:b9': 'apu',  # bare apu or control box
+   'b8:27:eb': 'cm3',  # iono pi
+   'd8:3a:dd': 'cm4',  # dual-eth-rpi
+}
+
 more_info = False
-os.chdir(f'{TOOLS}/to_system')
 
 DEL = '__to_delete__'
 CFGPATH = f'{TOOLS}/cfg/%s_%6.6x.cfg'
@@ -125,7 +130,15 @@ for netif in os.scandir('/sys/class/net'):
         net_addr[netif.name] = addr
 
 sorted_if = sorted(net_addr)
-apuid = int(''.join(net_addr[sorted_if[0]].split(':')[-3:]), 16) & 0xfffffc
+boxaddr = net_addr[sorted_if[0]]
+boxid = int(''.join(boxaddr.split(':')[-3:]), 16) & 0xffffff
+boxtype = BOX_TYPES.get(boxaddr[:8])
+if boxtype != 'apu':
+    ifname_mapping.clear()
+TO_SYSTEM = f'{TOOLS}/to_{boxtype}'
+if not exists(TO_SYSTEM):
+    TO_SYSTEM = f'{TOOLS}/to_system'
+os.chdir(TO_SYSTEM)
 
 
 def frappy(cfg=None, port=None, requirements='', **kwds):
@@ -144,7 +157,7 @@ def router(**opts):
     if not opts:
         return None
     try:
-        os.remove(join(TOOLS, 'to_system/etc/nftables.conf'))
+        os.remove(join(TO_SYSTEM, 'etc/nftables.conf'))
         with open(f'{TOOLS}/requirements.txt') as f:
             pip_requirements['root']['tools'] = f.read()
     except FileNotFoundError:
@@ -282,6 +295,7 @@ def create_if(name, cfg):
     else:
         cfgip = IPv4Interface(cfg)
         network = cfgip.network
+        print('N', network, network.prefixlen)
         if network.prefixlen == 32:  # or no prefix specified
             otherip = IPv4Interface('%s/24' % cfgip.ip)
             network = otherip.network
@@ -350,6 +364,7 @@ class Show(Walker):
             print('%s %s:\n  %s' % (title, self.syspath, ' '.join(files)))
 
     def show(self, title, dirpath, files):
+        self.dirty = True
         if more_info:
             for f in files:
                 print('cat %s' % join(dirpath, f))
@@ -391,14 +406,15 @@ def handle_config():
     cfgfile = None
     cfgfiles = []
     dhcp_server_cfg.clear()
-    for file in glob(CFGPATH % ('*', apuid)):
+    for file in glob(CFGPATH % ('*', boxid)):
          cfgfiles.append(file)
-    for i in [1, 2, 3]:
-        bad = glob(CFGPATH % ('*', apuid+i))
-        if bad:
-            print('cfg files found with bad apu id (use net addr of leftmost plug)')
-            print(bad)
-            return False
+    if boxtype == 'apu':
+        for i in [1, 2, 3]:
+            bad = glob(CFGPATH % ('*', apuid+i))
+            if bad:
+                print('cfg files found with bad apu id (use net addr of leftmost plug)')
+                print(bad)
+                return False
     newhostname = main_info['hostname']
     if not cfgfiles:
         # determine if display is present
@@ -415,19 +431,19 @@ def handle_config():
             # main_info['mainif'] = sorted_if[-1]
             typ = 'bare apu'
             template = CONFIG_TEMPLATE
-        print('no cfg file found for this', typ, f'with id {apuid:%6.6x} (hostname={hostname})')
+        print('no cfg file found for this', typ, f'with id {boxid:%6.6x} (hostname={hostname})')
         newhostname = input('enter host name: ')
         if not newhostname:
             print('no hostname given')
             return False
-        cfgfile = CFGPATH % (newhostname, apuid)
+        cfgfile = CFGPATH % (newhostname, boxid)
         with open(cfgfile, 'w') as f:
             f.write(template)
     elif len(cfgfiles) > 1:
         print('ERROR: ambiguous cfg files: %s' % ', '.join(cfgfiles))
     else:
         cfgfile = cfgfiles[0]
-    if cfgfile != CFGPATH % (newhostname, apuid):
+    if cfgfile != CFGPATH % (newhostname, boxid):
         if cfgfile:
             newhostname = basename(cfgfile).rpartition('_')[0]
         if doit:
@@ -453,6 +469,7 @@ def handle_config():
                 show.dirty = True
                 to_start[ifname] = 'if_restart'
         if dhcp_server_cfg:
+            print(dhcp_server_cfg)
             content = [DHCP_HEADER]
             for subnet, rangelist in dhcp_server_cfg:
                 try:
diff --git a/router.py b/router.py
index 0882ffc..4488879 100644
--- a/router.py
+++ b/router.py
@@ -410,8 +410,9 @@ class Service:
 
         try:
             ((prevline, prevports),) = pattern.findall(content)
-        except TypeError:
-            raise ValueError(f'{FIREWALL_CONF} does not contain expected pattern for open ports')
+        except (TypeError, ValueError):
+            print(f'{FIREWALL_CONF} does not contain expected pattern for open ports - firewall off?')
+            return
 
         # parse previous port set
         prevportset = {int(p) for p in prevports[1:-1].split(',')}