diff --git a/agent_based/cisco_asa_connections.py b/agent_based/cisco_asa_connections.py
index d6be45d6e151d80c9555f080eccb5f2c1f0c8c58..99c0818205f1d630a87407ff975f5ee49185655c 100644
--- a/agent_based/cisco_asa_connections.py
+++ b/agent_based/cisco_asa_connections.py
@@ -18,7 +18,7 @@
 #             more specific "1.3.6.1.4.1.9.9.147.1.2.2.2.1.5.40"
 # 2020-02-24: added support for Cisco Firepower Threat Defense
 # 2020-04-28: changed item from Cisco ASA connections to Firewall connections --> more clear, with cisco_asa_conn check
-# 2021-03-24: rewrite for CMK 2.0 Check API
+# 2021-03-24: rewrite for CMK 2.0 Check API, added lower levels
 #
 # sample snmp walk
 #
@@ -70,7 +70,7 @@ def discovery_cisco_asa_connections(section: CiscoAsaFwConnections) -> Discovery
 def check_cisco_asa_connections(params, section: CiscoAsaFwConnections) -> CheckResult:
     yield from check_levels(
         section.current,
-        levels_lower=params.get('lower', None),
+        levels_lower=params.get('connections_lower', None),
         levels_upper=params.get('connections', None),
         metric_name='fw_connections_active',
         render_func=lambda v: '%s' % str(v),
@@ -79,7 +79,7 @@ def check_cisco_asa_connections(params, section: CiscoAsaFwConnections) -> Check
     yield from check_levels(
         section.peak,
         label='Max. since system startup',
-        metric_name='peak_connections',
+        metric_name='fw_connections_peak',
         render_func=lambda v: '%s' % str(v),
     )
 
diff --git a/cisco_asa_connections.mkp b/cisco_asa_connections.mkp
index 84f04cfc5cbc3059b0951346203c46a360bd8eb0..4bb7115c46edc6d269ff923a840d6fef5a40bcda 100644
Binary files a/cisco_asa_connections.mkp and b/cisco_asa_connections.mkp differ
diff --git a/packages/cisco_asa_connections b/packages/cisco_asa_connections
index 19c2cb79b86f9c815ff44b6c921be20506674cc2..b081f15bffd85ce0062e890df4728e9850f79ae7 100644
--- a/packages/cisco_asa_connections
+++ b/packages/cisco_asa_connections
@@ -10,9 +10,10 @@
                 'connections\n',
  'download_url': 'https://thl-cmk.hopto.org',
  'files': {'agent_based': ['cisco_asa_connections.py'],
-           'web': ['plugins/metrics/cisco_asa_connections.py']},
+           'web': ['plugins/metrics/cisco_asa_connections.py',
+                   'plugins/wato/cisco_fw_connections.py']},
  'name': 'cisco_asa_connections',
- 'num_files': 2,
+ 'num_files': 3,
  'title': 'Monitor Cisco ASA connections',
  'version': '20210324.v.0.4',
  'version.min_required': '2.0.0',
diff --git a/web/plugins/metrics/cisco_asa_connections.py b/web/plugins/metrics/cisco_asa_connections.py
index 7c33f9ea75811f5cdb478ba748eb1d796ab75591..779627f274cc6367f69fbbc09239e4add64be837 100644
--- a/web/plugins/metrics/cisco_asa_connections.py
+++ b/web/plugins/metrics/cisco_asa_connections.py
@@ -1,77 +1,36 @@
-#!/usr/bin/python
-# -*- encoding: utf-8; py-indent-offset: 4 -*-
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
 #
 # Cisco ASA connections metrics plugin
 #
-# Author: Th.L.
-# Date  : 2018-01-09
-#
-
-#####################################################################################################################
-#
-# define units
-#
-#####################################################################################################################
 
+from cmk.gui.i18n import _
 
-#####################################################################################################################
-#
-# define metrics
-#
-#####################################################################################################################
+from cmk.gui.plugins.metrics import (
+    metric_info,
+    graph_info,
+)
 
-metric_info['cisco_asa_connections_current_connections'] = {
-    'title': _('current conections'),
+metric_info['fw_connections_active'] = {
+    'title': _('Active conections'),
     'unit': 'count',
     'color': '26/a',
 }
 
-
-metric_info['cisco_asa_connections_max_connections'] = {
-    'title': _('max conections'),
+metric_info['fw_connections_peak'] = {
+    'title': _('Peak conections'),
     'unit': 'count',
-    'color': '11/a',
+    'color': '16/a',
 }
 
-######################################################################################################################
-#
-# map perfdata to metric
-#
-######################################################################################################################
-
-check_metrics['check_mk-cisco_asa_connections'] = {
-    'current_connections': {'name': 'cisco_asa_connections_current_connections', },
-    'max_connections': {'name': 'cisco_asa_connections_max_connections',}
-}
-
-######################################################################################################################
-#
-# how to graph perdata
-#
-######################################################################################################################
-
-graph_info.append({
-    'title': _('connections'),
+graph_info['cisco_asa_connections'] = {
+    'title': _('Firewall connections'),
     'metrics': [
-        ('cisco_asa_connections_max_connections', 'line'),
-        ('cisco_asa_connections_current_connections', 'area'),
+        ('fw_connections_active', 'line'),
+        ('fw_connections_peak', 'area'),
     ],
     'scalars': [
-        ('cisco_asa_connections_current_connections:crit', _('crit level')),
-        ('cisco_asa_connections_current_connections:warn', _('warn level')),
+        ('fw_connections_active:crit', _('crit level')),
+        ('fw_connections_active:warn', _('warn level')),
     ],
-})
-
-######################################################################################################################
-#
-# define perf-o-meter
-#
-######################################################################################################################
-
-
-perfometer_info.append({
-    'type': 'logarithmic',
-    'metric': 'cisco_asa_connections_current_connections',
-    'half_value': 50000.0,
-    'exponent': 2,
-})
\ No newline at end of file
+}
diff --git a/web/plugins/wato/cisco_fw_connections.py b/web/plugins/wato/cisco_fw_connections.py
new file mode 100644
index 0000000000000000000000000000000000000000..69a13912507147e38650afce6a90f45c375bc531
--- /dev/null
+++ b/web/plugins/wato/cisco_fw_connections.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# Copyright (C) 2019 tribe29 GmbH - License: GNU General Public License v2
+# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
+# conditions defined in the file COPYING, which is part of this source code package.
+
+from cmk.gui.i18n import _
+from cmk.gui.valuespec import (
+    Dictionary,
+    Integer,
+    Tuple,
+)
+
+from cmk.gui.plugins.wato import (
+    CheckParameterRulespecWithoutItem,
+    rulespec_registry,
+    RulespecGroupCheckParametersApplications,
+)
+
+
+def _parameter_valuespec_cisco_fw_connections():
+    return Dictionary(elements=[
+        ('connections',
+         Tuple(
+             help=_('This rule sets ipper limits to the current number of connections through a Cisco firewall.'),
+             title=_('Maximum number of firewall connections'),
+             elements=[
+                 Integer(title=_('Warning at'), unit='connections'),
+                 Integer(title=_('Critical at'), unit='connections'),
+             ],
+         )),
+        ('connections_lower',
+         Tuple(
+             help=_('This rule sets lower limits to the current number of connections through a Cisco firewall.'),
+             title=_('Minimum number of firewall connections'),
+             elements=[
+                 Integer(title=_('Warning if below'), unit='connections'),
+                 Integer(title=_('Critical if below'), unit='connections'),
+             ],
+         )),
+
+    ],)
+
+
+rulespec_registry.register(
+    CheckParameterRulespecWithoutItem(
+        check_group_name='cisco_fw_connections',
+        group=RulespecGroupCheckParametersApplications,
+        match_type='dict',
+        parameter_valuespec=_parameter_valuespec_cisco_fw_connections,
+        title=lambda: _('Cisco Firewall Connections'),
+    ))
\ No newline at end of file