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	diff --git a/src/conf_mode/flow_accounting_conf.py b/src/conf_mode/flow_accounting_conf.py
	index 11df81b1d..d691e6abd 100755
	--- a/src/conf_mode/flow_accounting_conf.py
	+++ b/src/conf_mode/flow_accounting_conf.py
	@@ -1,368 +1,368 @@
	#!/usr/bin/env python3
	#
	# Copyright (C) 2018-2020 VyOS maintainers and contributors
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License version 2 or later as
	# published by the Free Software Foundation.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	import os
	import re
	from sys import exit
	import ipaddress

	from ipaddress import ip_address
	from jinja2 import FileSystemLoader, Environment

	from vyos.ifconfig import Section
	from vyos.ifconfig import Interface
	from vyos.config import Config
	from vyos import ConfigError
	from vyos.util import cmd
	from vyos.template import render

	# default values
	default_sflow_server_port = 6343
	default_netflow_server_port = 2055
	default_plugin_pipe_size = 10
	default_captured_packet_size = 128
	default_netflow_version = '9'
	default_sflow_agentip = 'auto'
	uacctd_conf_path = '/etc/pmacct/uacctd.conf'
	iptables_nflog_table = 'raw'
	iptables_nflog_chain = 'VYATTA_CT_PREROUTING_HOOK'

	# helper functions
	# check if node exists and return True if this is true
	def _node_exists(path):
	vyos_config = Config()
	if vyos_config.exists(path):
	return True

	# get sFlow agent-ip if agent-address is "auto" (default behaviour)
	def _sflow_default_agentip(config):
	# check if any of BGP, OSPF, OSPFv3 protocols are configured and use router-id from there
	if config.exists('protocols bgp'):
	bgp_router_id = config.return_value("protocols bgp {} parameters router-id".format(config.list_nodes('protocols bgp')[0]))
	if bgp_router_id:
	return bgp_router_id
	if config.return_value('protocols ospf parameters router-id'):
	return config.return_value('protocols ospf parameters router-id')
	if config.return_value('protocols ospfv3 parameters router-id'):
	return config.return_value('protocols ospfv3 parameters router-id')

	# if router-id was not found, use first available ip of any interface
	for iface in Section.interfaces():
	for address in Interface(iface).get_addr():
	# return an IP, if this is not loopback
	regex_filter = re.compile('^(?!(127)\|(::1)\|(fe80))(?P<ipaddr>[a-f\d\.:]+)/\d+$')
	if regex_filter.search(address):
	return regex_filter.search(address).group('ipaddr')

	# return nothing by default
	return None

	# get iptables rule dict for chain in table
	def _iptables_get_nflog():
	# define list with rules
	rules = []

	# prepare regex for parsing rules
	rule_pattern = "^-A (?P<rule_definition>{0} -i (?P<interface>[\w\.\\-]+).--comment FLOW_ACCOUNTING_RULE.* -j NFLOG.*$)".format(iptables_nflog_chain)
	rule_re = re.compile(rule_pattern)

	for iptables_variant in ['iptables', 'ip6tables']:
	# run iptables, save output and split it by lines
	iptables_command = "sudo {0} -t {1} -S {2}".format(iptables_variant, iptables_nflog_table, iptables_nflog_chain)
	tmp = cmd(iptables_command, message='Failed to get flows list')

	# parse each line and add information to list
	for current_rule in tmp.splitlines():
	current_rule_parsed = rule_re.search(current_rule)
	if current_rule_parsed:
	rules.append({ 'interface': current_rule_parsed.groupdict()["interface"], 'iptables_variant': iptables_variant, 'table': iptables_nflog_table, 'rule_definition': current_rule_parsed.groupdict()["rule_definition"] })

	# return list with rules
	return rules

	# modify iptables rules
	def _iptables_config(configured_ifaces):
	# define list of iptables commands to modify settings
	iptable_commands = []

	# prepare extended list with configured interfaces
	configured_ifaces_extended = []
	for iface in configured_ifaces:
	configured_ifaces_extended.append({ 'iface': iface, 'iptables_variant': 'iptables' })
	configured_ifaces_extended.append({ 'iface': iface, 'iptables_variant': 'ip6tables' })

	# get currently configured interfaces with iptables rules
	active_nflog_rules = _iptables_get_nflog()

	# compare current active list with configured one and delete excessive interfaces, add missed
	active_nflog_ifaces = []
	for rule in active_nflog_rules:
	iptables = rule['iptables_variant']
	interface = rule['interface']
	if interface not in configured_ifaces:
	table = rule['table']
	rule = rule['rule_definition']
	iptable_commands.append(f'sudo {iptables} -t {table} -D {rule}')
	else:
	active_nflog_ifaces.append({
	'iface': interface,
	'iptables_variant': iptables,
	})

	# do not create new rules for already configured interfaces
	for iface in active_nflog_ifaces:
	if iface in active_nflog_ifaces:
	configured_ifaces_extended.remove(iface)

	# create missed rules
	for iface_extended in configured_ifaces_extended:
	iface = iface_extended['iface']
	iptables = iface_extended['iptables_variant']
	rule_definition = f'{iptables_nflog_chain} -i {iface} -m comment --comment FLOW_ACCOUNTING_RULE -j NFLOG --nflog-group 2 --nflog-size {default_captured_packet_size} --nflog-threshold 100'
	iptable_commands.append(f'sudo {iptables} -t {iptables_nflog_table} -I {rule_definition}')

	# change iptables
	for command in iptable_commands:
	cmd(command, raising=ConfigError)


	def get_config():
	vc = Config()
	vc.set_level('')
	# Convert the VyOS config to an abstract internal representation
	flow_config = {
	'flow-accounting-configured': vc.exists('system flow-accounting'),
	'buffer-size': vc.return_value('system flow-accounting buffer-size'),
	'disable-imt': _node_exists('system flow-accounting disable-imt'),
	'syslog-facility': vc.return_value('system flow-accounting syslog-facility'),
	'interfaces': None,
	'sflow': {
	'configured': vc.exists('system flow-accounting sflow'),
	'agent-address': vc.return_value('system flow-accounting sflow agent-address'),
	'sampling-rate': vc.return_value('system flow-accounting sflow sampling-rate'),
	'servers': None
	},
	'netflow': {
	'configured': vc.exists('system flow-accounting netflow'),
	'engine-id': vc.return_value('system flow-accounting netflow engine-id'),
	'max-flows': vc.return_value('system flow-accounting netflow max-flows'),
	'sampling-rate': vc.return_value('system flow-accounting netflow sampling-rate'),
	'source-ip': vc.return_value('system flow-accounting netflow source-ip'),
	'version': vc.return_value('system flow-accounting netflow version'),
	'timeout': {
	'expint': vc.return_value('system flow-accounting netflow timeout expiry-interval'),
	'general': vc.return_value('system flow-accounting netflow timeout flow-generic'),
	'icmp': vc.return_value('system flow-accounting netflow timeout icmp'),
	'maxlife': vc.return_value('system flow-accounting netflow timeout max-active-life'),
	'tcp.fin': vc.return_value('system flow-accounting netflow timeout tcp-fin'),
	'tcp': vc.return_value('system flow-accounting netflow timeout tcp-generic'),
	'tcp.rst': vc.return_value('system flow-accounting netflow timeout tcp-rst'),
	'udp': vc.return_value('system flow-accounting netflow timeout udp')
	},
	'servers': None
	}
	}

	# get interfaces list
	if vc.exists('system flow-accounting interface'):
	flow_config['interfaces'] = vc.return_values('system flow-accounting interface')

	# get sFlow collectors list
	if vc.exists('system flow-accounting sflow server'):
	flow_config['sflow']['servers'] = []
	sflow_collectors = vc.list_nodes('system flow-accounting sflow server')
	for collector in sflow_collectors:
	port = default_sflow_server_port
	if vc.return_value("system flow-accounting sflow server {} port".format(collector)):
	port = vc.return_value("system flow-accounting sflow server {} port".format(collector))
	flow_config['sflow']['servers'].append({ 'address': collector, 'port': port })

	# get NetFlow collectors list
	if vc.exists('system flow-accounting netflow server'):
	flow_config['netflow']['servers'] = []
	netflow_collectors = vc.list_nodes('system flow-accounting netflow server')
	for collector in netflow_collectors:
	port = default_netflow_server_port
	if vc.return_value("system flow-accounting netflow server {} port".format(collector)):
	port = vc.return_value("system flow-accounting netflow server {} port".format(collector))
	flow_config['netflow']['servers'].append({ 'address': collector, 'port': port })

	# get sflow agent-id
	if flow_config['sflow']['agent-address'] == None or flow_config['sflow']['agent-address'] == 'auto':
	flow_config['sflow']['agent-address'] = _sflow_default_agentip(vc)

	# get NetFlow version
	if not flow_config['netflow']['version']:
	flow_config['netflow']['version'] = default_netflow_version

	# convert NetFlow engine-id format, if this is necessary
	if flow_config['netflow']['engine-id'] and flow_config['netflow']['version'] == '5':
	regex_filter = re.compile('^\d+$')
	if regex_filter.search(flow_config['netflow']['engine-id']):
	flow_config['netflow']['engine-id'] = "{}:0".format(flow_config['netflow']['engine-id'])

	# return dict with flow-accounting configuration
	return flow_config

	def verify(config):
	# Verify that configuration is valid
	# skip all checks if flow-accounting was removed
	if not config['flow-accounting-configured']:
	return True

	# check if at least one collector is enabled
	if not (config['sflow']['configured'] or config['netflow']['configured'] or not config['disable-imt']):
	raise ConfigError("You need to configure at least one sFlow or NetFlow protocol, or not set \"disable-imt\" for flow-accounting")

	# Check if at least one interface is configured
	if not config['interfaces']:
	raise ConfigError("You need to configure at least one interface for flow-accounting")

	# check that all configured interfaces exists in the system
	for iface in config['interfaces']:
	if not iface in Section.interfaces():
	# chnged from error to warning to allow adding dynamic interfaces and interface templates
	# raise ConfigError("The {} interface is not presented in the system".format(iface))
	print("Warning: the {} interface is not presented in the system".format(iface))

	# check sFlow configuration
	if config['sflow']['configured']:
	# check if at least one sFlow collector is configured if sFlow configuration is presented
	if not config['sflow']['servers']:
	raise ConfigError("You need to configure at least one sFlow server")

	# check that all sFlow collectors use the same IP protocol version
	sflow_collector_ipver = None
	for sflow_collector in config['sflow']['servers']:
	if sflow_collector_ipver:
	if sflow_collector_ipver != ip_address(sflow_collector['address']).version:
	raise ConfigError("All sFlow servers must use the same IP protocol")
	else:
	sflow_collector_ipver = ip_address(sflow_collector['address']).version


	# check agent-id for sFlow: we should avoid mixing IPv4 agent-id with IPv6 collectors and vice-versa
	for sflow_collector in config['sflow']['servers']:
	if ip_address(sflow_collector['address']).version != ip_address(config['sflow']['agent-address']).version:
	raise ConfigError("Different IP address versions cannot be mixed in \"sflow agent-address\" and \"sflow server\". You need to set manually the same IP version for \"agent-address\" as for all sFlow servers")

	# check if configured sFlow agent-id exist in the system
	agent_id_presented = None
	for iface in Section.interfaces():
	for address in Interface(iface).get_addr():
	# check an IP, if this is not loopback
	regex_filter = re.compile('^(?!(127)\|(::1)\|(fe80))(?P<ipaddr>[a-f\d\.:]+)/\d+$')
	if regex_filter.search(address):
	if regex_filter.search(address).group('ipaddr') == config['sflow']['agent-address']:
	agent_id_presented = True
	break
	if not agent_id_presented:
	raise ConfigError("Your \"sflow agent-address\" does not exist in the system")

	# check NetFlow configuration
	if config['netflow']['configured']:
	# check if at least one NetFlow collector is configured if NetFlow configuration is presented
	if not config['netflow']['servers']:
	raise ConfigError("You need to configure at least one NetFlow server")

	# check if configured netflow source-ip exist in the system
	if config['netflow']['source-ip']:
	source_ip_presented = None
	- for iface in Interface.listing():
	+ for iface in Section.interfaces():
	for address in Interface(iface).get_addr():
	# check an IP
	regex_filter = re.compile('^(?!(127)\|(::1)\|(fe80))(?P<ipaddr>[a-f\d\.:]+)/\d+$')
	if regex_filter.search(address):
	if regex_filter.search(address).group('ipaddr') == config['netflow']['source-ip']:
	source_ip_presented = True
	break
	if not source_ip_presented:
	raise ConfigError("Your \"netflow source-ip\" does not exist in the system")

	# check if engine-id compatible with selected protocol version
	if config['netflow']['engine-id']:
	v5_filter = '^(\d\|[1-9]\d\|1\d{2}\|2[0-4]\d\|25[0-5]):(\d\|[1-9]\d\|1\d{2}\|2[0-4]\d\|25[0-5])$'
	v9v10_filter = '^(\d\|[1-9]\d{1,8}\|[1-3]\d{9}\|4[01]\d{8}\|42[0-8]\d{7}\|429[0-3]\d{6}\|4294[0-8]\d{5}\|42949[0-5]\d{4}\|429496[0-6]\d{3}\|4294967[01]\d{2}\|42949672[0-8]\d\|429496729[0-5])$'
	if config['netflow']['version'] == '5':
	regex_filter = re.compile(v5_filter)
	if not regex_filter.search(config['netflow']['engine-id']):
	raise ConfigError("You cannot use NetFlow engine-id {} together with NetFlow protocol version {}".format(config['netflow']['engine-id'], config['netflow']['version']))
	else:
	regex_filter = re.compile(v9v10_filter)
	if not regex_filter.search(config['netflow']['engine-id']):
	raise ConfigError("You cannot use NetFlow engine-id {} together with NetFlow protocol version {}".format(config['netflow']['engine-id'], config['netflow']['version']))

	# return True if all checks were passed
	return True

	def generate(config):
	# skip all checks if flow-accounting was removed
	if not config['flow-accounting-configured']:
	return True

	# Calculate all necessary values
	if config['buffer-size']:
	# circular queue size
	config['plugin_pipe_size'] = int(config['buffer-size']) * 1024**2
	else:
	config['plugin_pipe_size'] = default_plugin_pipe_size * 1024**2
	# transfer buffer size
	# recommended value from pmacct developers 1/1000 of pipe size
	config['plugin_buffer_size'] = int(config['plugin_pipe_size'] / 1000)

	# Prepare a timeouts string
	timeout_string = ''
	for timeout_type, timeout_value in config['netflow']['timeout'].items():
	if timeout_value:
	if timeout_string == '':
	timeout_string = "{}{}={}".format(timeout_string, timeout_type, timeout_value)
	else:
	timeout_string = "{}:{}={}".format(timeout_string, timeout_type, timeout_value)
	config['netflow']['timeout_string'] = timeout_string

	render(uacctd_conf_path, 'netflow/uacctd.conf.tmpl', {
	'templatecfg': config,
	'snaplen': default_captured_packet_size,
	})


	def apply(config):
	# define variables
	command = None
	# Check if flow-accounting was removed and define command
	if not config['flow-accounting-configured']:
	command = 'systemctl stop uacctd.service'
	else:
	command = 'systemctl restart uacctd.service'

	# run command to start or stop flow-accounting
	cmd(command, raising=ConfigError, message='Failed to start/stop flow-accounting')

	# configure iptables rules for defined interfaces
	if config['interfaces']:
	_iptables_config(config['interfaces'])
	else:
	_iptables_config([])

	if __name__ == '__main__':
	try:
	config = get_config()
	verify(config)
	generate(config)
	apply(config)
	except ConfigError as e:
	print(e)
	exit(1)

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