diff --git a/install.py b/install.py
index 09798ef..4f5dda4 100755
--- a/install.py
+++ b/install.py
@@ -206,8 +206,8 @@ def create_if(name, cfg, mac, dhcp_server_cfg):
         dhcp_server_cfg.append(('0.0.0.0/128.0.0.0', []))
         dhcp_server_cfg.append(('128.0.0.0/192.0.0.0', []))
         for nw in cfg.split(',')[1:]:
-            nw = IPv4Interface(cfg).network
-            dhcp_server_cfg.append((nw.with_netmask.split('/'), []))
+            nw = IPv4Interface(nw).network
+            dhcp_server_cfg.append((nw.with_netmask, []))
     else:
         cfgip = IPv4Interface(cfg)
         network = cfgip.network
@@ -365,7 +365,11 @@ def handle_config():
         if dhcp_server_cfg:
             content = [DHCP_HEADER]
             for subnet, rangelist in dhcp_server_cfg:
-                adr, mask = subnet.split('/')
+                try:
+                    adr, mask = subnet.split('/')
+                except Exception as e:
+                    print(subnet, repr(e))
+                    continue
                 content.append('subnet %s netmask %s {\n' % (adr, mask))
                 #content.append('    option netmask %s;\n' % mask)
                 for rng in rangelist: