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	diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
	index b002e0171..bb6c33f5f 100644
	--- a/python/vyos/ifconfig/interface.py
	+++ b/python/vyos/ifconfig/interface.py
	@@ -1,830 +1,828 @@
	# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
	#
	# This library is free software; you can redistribute it and/or
	# modify it under the terms of the GNU Lesser General Public
	# License as published by the Free Software Foundation; either
	# version 2.1 of the License, or (at your option) any later version.
	#
	# This library 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
	# Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public
	# License along with this library. If not, see <http://www.gnu.org/licenses/>.

	import os
	import re
	import jinja2
	import json
	import glob
	import time
	from copy import deepcopy

	import vyos.interfaces

	from vyos.validate import * # should not * include
	from vyos.config import Config # not used anymore
	from vyos import ConfigError

	from ipaddress import IPv4Network, IPv6Address
	from netifaces import ifaddresses, AF_INET, AF_INET6
	from time import sleep
	from os.path import isfile
	from tabulate import tabulate
	from hurry.filesize import size,alternative
	from datetime import timedelta

	from vyos.ifconfig.control import Control

	dhclient_base = r'/var/lib/dhcp/dhclient_'
	dhcp_cfg = """
	# generated by ifconfig.py
	option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
	timeout 60;
	retry 300;

	interface "{{ intf }}" {
	send host-name "{{ hostname }}";
	{% if client_id -%}
	send dhcp-client-identifier "{{ client_id }}";
	{% endif -%}
	{% if vendor_class_id -%}
	send vendor-class-identifier "{{ vendor_class_id }}";
	{% endif -%}
	request subnet-mask, broadcast-address, routers, domain-name-servers,
	rfc3442-classless-static-routes, domain-name, interface-mtu;
	require subnet-mask;
	}

	"""

	dhcpv6_cfg = """
	# generated by ifconfig.py
	interface "{{ intf }}" {
	request routers, domain-name-servers, domain-name;
	}

	"""



	class Interface(Control):
	options = []
	required = []
	default = {
	'type': '',
	}

	_command_set = {
	+ 'state': {
	+ 'validate': lambda v: assert_list(v, ['up', 'down']),
	+ 'shellcmd': 'ip link set dev {ifname} {value}',
	+ },
	'mac': {
	'validate': assert_mac,
	'shellcmd': 'ip link set dev {ifname} address {value}',
	},
	'add_vrf': {
	'shellcmd': 'ip link set dev {ifname} master {value}',
	},
	'del_vrf': {
	'shellcmd': 'ip link set dev {ifname} nomaster {value}',
	},
	}

	_sysfs_get = {
	'mtu': {
	'location': '/sys/class/net/{ifname}/mtu',
	},
	}

	_sysfs_set = {
	'alias': {
	'convert': lambda name: name if name else '\0',
	'location': '/sys/class/net/{ifname}/ifalias',
	},
	'mtu': {
	'validate': assert_mtu,
	'location': '/sys/class/net/{ifname}/mtu',
	},
	'arp_cache_tmo': {
	'convert': lambda tmo: (int(tmo) * 1000),
	'location': '/proc/sys/net/ipv4/neigh/{ifname}/base_reachable_time_ms',
	},
	'arp_filter': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_filter',
	},
	'arp_accept': {
	'validate': lambda arp: assert_range(arp,0,2),
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_accept',
	},
	'arp_announce': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_announce',
	},
	'arp_ignore': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/arp_ignore',
	},
	'proxy_arp': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/proxy_arp',
	},
	'proxy_arp_pvlan': {
	'validate': assert_boolean,
	'location': '/proc/sys/net/ipv4/conf/{ifname}/proxy_arp_pvlan',
	},
	# link_detect vs link_filter name weirdness
	'link_detect': {
	'validate': lambda link: assert_range(link,0,3),
	'location': '/proc/sys/net/ipv4/conf/{ifname}/link_filter',
	},
	}

	def __init__(self, ifname, **kargs):
	"""
	This is the base interface class which supports basic IP/MAC address
	operations as well as DHCP(v6). Other interface which represent e.g.
	and ethernet bridge are implemented as derived classes adding all
	additional functionality.

	For creation you will need to provide the interface type, otherwise
	the existing interface is used

	DEBUG:
	This class has embedded debugging (print) which can be enabled by
	creating the following file:
	vyos@vyos# touch /tmp/vyos.ifconfig.debug

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	"""

	self.config = deepcopy(self.default)
	self.config['ifname'] = ifname

	for k in self.options:
	if k in kargs:
	self.config[k] = kargs[k]

	for k in self.required:
	if k not in kargs:
	raise ConfigError('missing required option {} for {}'.format(k,self.__class__))

	if not os.path.exists('/sys/class/net/{}'.format(self.config['ifname'])):
	if not self.config['type']:
	raise Exception('interface "{}" not found'.format(self.config['ifname']))
	self._create()

	# per interface DHCP config files
	self._dhcp_cfg_file = dhclient_base + self.config['ifname'] + '.conf'
	self._dhcp_pid_file = dhclient_base + self.config['ifname'] + '.pid'
	self._dhcp_lease_file = dhclient_base + self.config['ifname'] + '.leases'

	# per interface DHCPv6 config files
	self._dhcpv6_cfg_file = dhclient_base + self.config['ifname'] + '.v6conf'
	self._dhcpv6_pid_file = dhclient_base + self.config['ifname'] + '.v6pid'
	self._dhcpv6_lease_file = dhclient_base + self.config['ifname'] + '.v6leases'

	# DHCP options
	self._dhcp_options = {
	'intf' : self.config['ifname'],
	'hostname' : '',
	'client_id' : '',
	'vendor_class_id' : ''
	}

	# DHCPv6 options
	self._dhcpv6_options = {
	'intf' : self.config['ifname'],
	'dhcpv6_prm_only' : False,
	'dhcpv6_temporary' : False
	}

	# list of assigned IP addresses
	self._addr = []

	def _create(self):
	cmd = 'ip link add dev {ifname} type {type}'.format(**self.config)
	self._cmd(cmd)

	def remove(self):
	"""
	Remove interface from operating system. Removing the interface
	deconfigures all assigned IP addresses and clear possible DHCP(v6)
	client processes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> i = Interface('eth0')
	>>> i.remove()
	"""
	# stop DHCP(v6) if running
	self._del_dhcp()
	self._del_dhcpv6()

	# remove all assigned IP addresses from interface - this is a bit redundant
	# as the kernel will remove all addresses on interface deletion, but we
	# can not delete ALL interfaces, see below
	for addr in self.get_addr():
	self.del_addr(addr)

	# ---------------------------------------------------------------------
	# A code refactoring is required as this type check is present as
	# Interface implement behaviour for one of it's sub-class.

	# It is required as the current pattern for vlan is:
	# Interface('name').remove() to delete an interface
	# The code should be modified to have a class method called connect and
	# have Interface.connect('name').remove()

	# each subclass should register within Interface the pattern for that
	# interface ie: (ethX, etc.) and use this to create an instance of
	# the right class (EthernetIf, ...)

	# Ethernet interfaces can not be removed

	# Commented out as nowhere in the code do we call Interface()
	# This would also cause an import loop
	# if self.__class__ == EthernetIf:
	# return

	# ---------------------------------------------------------------------

	self._delete()

	def _delete(self):
	# NOTE (Improvement):
	# after interface removal no other commands should be allowed
	# to be called and instead should raise an Exception:
	cmd = 'ip link del dev {}'.format(self.config['ifname'])
	return self._cmd(cmd)

	def get_mtu(self):
	"""
	Get/set interface mtu in bytes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_mtu()
	'1500'
	"""
	return self.get_interface('mtu')

	def set_mtu(self, mtu):
	"""
	Get/set interface mtu in bytes.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_mtu(1400)
	>>> Interface('eth0').get_mtu()
	'1400'
	"""
	return self.set_interface('mtu', mtu)

	def set_mac(self, mac):
	"""
	Set interface MAC (Media Access Contrl) address to given value.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_mac('00:50:ab:cd:ef:01')
	"""
	self.set_interface('mac', mac)

	def add_vrf(self, vrf):
	"""
	Add interface to given VRF instance.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').add_vrf('foo')
	"""
	self.set_interface('add_vrf', vrf)

	def del_vrf(self, vrf):
	"""
	Remove interface from given VRF instance.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').del_vrf('foo')
	"""
	self.set_interface('del_vrf', vrf)

	def set_arp_cache_tmo(self, tmo):
	"""
	Set ARP cache timeout value in seconds. Internal Kernel representation
	is in milliseconds.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_arp_cache_tmo(40)
	"""
	return self.set_interface('arp_cache_tmo', tmo)

	def set_arp_filter(self, arp_filter):
	"""
	Filter ARP requests

	1 - Allows you to have multiple network interfaces on the same
	subnet, and have the ARPs for each interface be answered
	based on whether or not the kernel would route a packet from
	the ARP'd IP out that interface (therefore you must use source
	based routing for this to work). In other words it allows control
	of which cards (usually 1) will respond to an arp request.

	0 - (default) The kernel can respond to arp requests with addresses
	from other interfaces. This may seem wrong but it usually makes
	sense, because it increases the chance of successful communication.
	IP addresses are owned by the complete host on Linux, not by
	particular interfaces. Only for more complex setups like load-
	balancing, does this behaviour cause problems.
	"""
	return self.set_interface('arp_filter', arp_filter)

	def set_arp_accept(self, arp_accept):
	"""
	Define behavior for gratuitous ARP frames who's IP is not
	already present in the ARP table:
	0 - don't create new entries in the ARP table
	1 - create new entries in the ARP table

	Both replies and requests type gratuitous arp will trigger the
	ARP table to be updated, if this setting is on.

	If the ARP table already contains the IP address of the
	gratuitous arp frame, the arp table will be updated regardless
	if this setting is on or off.
	"""
	return self.set_interface('arp_accept', arp_accept)

	def set_arp_announce(self, arp_announce):
	"""
	Define different restriction levels for announcing the local
	source IP address from IP packets in ARP requests sent on
	interface:
	0 - (default) Use any local address, configured on any interface
	1 - Try to avoid local addresses that are not in the target's
	subnet for this interface. This mode is useful when target
	hosts reachable via this interface require the source IP
	address in ARP requests to be part of their logical network
	configured on the receiving interface. When we generate the
	request we will check all our subnets that include the
	target IP and will preserve the source address if it is from
	such subnet.

	Increasing the restriction level gives more chance for
	receiving answer from the resolved target while decreasing
	the level announces more valid sender's information.
	"""
	return self.set_interface('arp_announce', arp_announce)

	def set_arp_ignore(self, arp_ignore):
	"""
	Define different modes for sending replies in response to received ARP
	requests that resolve local target IP addresses:

	0 - (default): reply for any local target IP address, configured
	on any interface
	1 - reply only if the target IP address is local address
	configured on the incoming interface
	"""
	return self.set_interface('arp_ignore', arp_ignore)

	def set_link_detect(self, link_filter):
	"""
	Configure kernel response in packets received on interfaces that are 'down'

	0 - Allow packets to be received for the address on this interface
	even if interface is disabled or no carrier.

	1 - Ignore packets received if interface associated with the incoming
	address is down.

	2 - Ignore packets received if interface associated with the incoming
	address is down or has no carrier.

	Default value is 0. Note that some distributions enable it in startup
	scripts.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_link_detect(1)
	"""
	return self.set_interface('link_detect', link_filter)

	def set_alias(self, ifalias=''):
	"""
	Set interface alias name used by e.g. SNMP

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_alias('VyOS upstream interface')

	to clear alias e.g. delete it use:

	>>> Interface('eth0').set_ifalias('')
	"""
	self.set_interface('alias', ifalias)

	def get_state(self):
	"""
	Enable (up) / Disable (down) an interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_state()
	'up'
	"""
	cmd = 'ip -json link show dev {}'.format(self.config['ifname'])
	tmp = self._cmd(cmd)
	out = json.loads(tmp)
	return out[0]['operstate'].lower()

	def set_state(self, state):
	"""
	Enable (up) / Disable (down) an interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_state('down')
	>>> Interface('eth0').get_state()
	'down'
	"""
	- if state not in ['up', 'down']:
	- raise ValueError('state must be "up" or "down"')
	-
	- # Assemble command executed on system. Unfortunately there is no way
	- # to up/down an interface via sysfs
	- cmd = 'ip link set dev {} {}'.format(self.config['ifname'], state)
	- return self._cmd(cmd)
	+ return self.set_interface('state', state)

	def set_proxy_arp(self, enable):
	"""
	Set per interface proxy ARP configuration

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_proxy_arp(1)
	"""
	self.set_interface('proxy_arp', enable)

	def set_proxy_arp_pvlan(self, enable):
	"""
	Private VLAN proxy arp.
	Basically allow proxy arp replies back to the same interface
	(from which the ARP request/solicitation was received).

	This is done to support (ethernet) switch features, like RFC
	3069, where the individual ports are NOT allowed to
	communicate with each other, but they are allowed to talk to
	the upstream router. As described in RFC 3069, it is possible
	to allow these hosts to communicate through the upstream
	router by proxy_arp'ing. Don't need to be used together with
	proxy_arp.

	This technology is known by different names:
	In RFC 3069 it is called VLAN Aggregation.
	Cisco and Allied Telesyn call it Private VLAN.
	Hewlett-Packard call it Source-Port filtering or port-isolation.
	Ericsson call it MAC-Forced Forwarding (RFC Draft).

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').set_proxy_arp_pvlan(1)
	"""
	self.set_interface('proxy_arp_pvlan', enable)

	def get_addr(self):
	"""
	Retrieve assigned IPv4 and IPv6 addresses from given interface.
	This is done using the netifaces and ipaddress python modules.

	Example:
	>>> from vyos.ifconfig import Interface
	>>> Interface('eth0').get_addrs()
	['172.16.33.30/24', 'fe80::20c:29ff:fe11:a174/64']
	"""

	ipv4 = []
	ipv6 = []

	if AF_INET in ifaddresses(self.config['ifname']).keys():
	for v4_addr in ifaddresses(self.config['ifname'])[AF_INET]:
	# we need to manually assemble a list of IPv4 address/prefix
	prefix = '/' + \
	str(IPv4Network('0.0.0.0/' + v4_addr['netmask']).prefixlen)
	ipv4.append(v4_addr['addr'] + prefix)

	if AF_INET6 in ifaddresses(self.config['ifname']).keys():
	for v6_addr in ifaddresses(self.config['ifname'])[AF_INET6]:
	# Note that currently expanded netmasks are not supported. That means
	# 2001:db00::0/24 is a valid argument while 2001:db00::0/ffff:ff00:: not.
	# see https://docs.python.org/3/library/ipaddress.html
	bits = bin(
	int(v6_addr['netmask'].replace(':', ''), 16)).count('1')
	prefix = '/' + str(bits)

	# we alsoneed to remove the interface suffix on link local
	# addresses
	v6_addr['addr'] = v6_addr['addr'].split('%')[0]
	ipv6.append(v6_addr['addr'] + prefix)

	return ipv4 + ipv6

	def add_addr(self, addr):
	"""
	Add IP(v6) address to interface. Address is only added if it is not
	already assigned to that interface.

	addr: can be an IPv4 address, IPv6 address, dhcp or dhcpv6!
	IPv4: add IPv4 address to interface
	IPv6: add IPv6 address to interface
	dhcp: start dhclient (IPv4) on interface
	dhcpv6: start dhclient (IPv6) on interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.add_addr('192.0.2.1/24')
	>>> j.add_addr('2001:db8::ffff/64')
	>>> j.get_addr()
	['192.0.2.1/24', '2001:db8::ffff/64']
	"""

	# cache new IP address which is assigned to interface
	self._addr.append(addr)

	# we can not have both DHCP and static IPv4 addresses assigned to an interface
	if 'dhcp' in self._addr:
	for addr in self._addr:
	# do not change below 'if' ordering esle you will get an exception as:
	# ValueError: 'dhcp' does not appear to be an IPv4 or IPv6 address
	if addr != 'dhcp' and is_ipv4(addr):
	raise ConfigError("Can't configure both static IPv4 and DHCP address on the same interface")

	if addr == 'dhcp':
	self._set_dhcp()
	elif addr == 'dhcpv6':
	self._set_dhcpv6()
	else:
	if not is_intf_addr_assigned(self.config['ifname'], addr):
	cmd = 'ip addr add "{}" dev "{}"'.format(addr, self.config['ifname'])
	return self._cmd(cmd)

	def del_addr(self, addr):
	"""
	Delete IP(v6) address to interface. Address is only added if it is
	assigned to that interface.

	addr: can be an IPv4 address, IPv6 address, dhcp or dhcpv6!
	IPv4: delete IPv4 address from interface
	IPv6: delete IPv6 address from interface
	dhcp: stop dhclient (IPv4) on interface
	dhcpv6: stop dhclient (IPv6) on interface

	Example:
	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.add_addr('2001:db8::ffff/64')
	>>> j.add_addr('192.0.2.1/24')
	>>> j.get_addr()
	['192.0.2.1/24', '2001:db8::ffff/64']
	>>> j.del_addr('192.0.2.1/24')
	>>> j.get_addr()
	['2001:db8::ffff/64']
	"""
	if addr == 'dhcp':
	self._del_dhcp()
	elif addr == 'dhcpv6':
	self._del_dhcpv6()
	else:
	if is_intf_addr_assigned(self.config['ifname'], addr):
	cmd = 'ip addr del "{}" dev "{}"'.format(addr, self.config['ifname'])
	return self._cmd(cmd)


	def get_dhcp_options(self):
	"""
	Return dictionary with supported DHCP options.

	Dictionary should be altered and send back via set_dhcp_options()
	so those options are applied when DHCP is run.
	"""
	return self._dhcp_options

	def set_dhcp_options(self, options):
	"""
	Store new DHCP options used by next run of DHCP client.
	"""
	self._dhcp_options = options

	def get_dhcpv6_options(self):
	"""
	Return dictionary with supported DHCPv6 options.

	Dictionary should be altered and send back via set_dhcp_options()
	so those options are applied when DHCP is run.
	"""
	return self._dhcpv6_options

	def set_dhcpv6_options(self, options):
	"""
	Store new DHCP options used by next run of DHCP client.
	"""
	self._dhcpv6_options = options

	# replace dhcpv4/v6 with systemd.networkd?
	def _set_dhcp(self):
	"""
	Configure interface as DHCP client. The dhclient binary is automatically
	started in background!

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.set_dhcp()
	"""

	dhcp = self.get_dhcp_options()
	if not dhcp['hostname']:
	# read configured system hostname.
	# maybe change to vyos hostd client ???
	with open('/etc/hostname', 'r') as f:
	dhcp['hostname'] = f.read().rstrip('\n')

	# render DHCP configuration
	tmpl = jinja2.Template(dhcp_cfg)
	dhcp_text = tmpl.render(dhcp)
	with open(self._dhcp_cfg_file, 'w') as f:
	f.write(dhcp_text)

	cmd = 'start-stop-daemon --start --quiet --pidfile ' + \
	self._dhcp_pid_file
	cmd += ' --exec /sbin/dhclient --'
	# now pass arguments to dhclient binary
	cmd += ' -4 -nw -cf {} -pf {} -lf {} {}'.format(
	self._dhcp_cfg_file, self._dhcp_pid_file, self._dhcp_lease_file, self.config['ifname'])
	return self._cmd(cmd)


	def _del_dhcp(self):
	"""
	De-configure interface as DHCP clinet. All auto generated files like
	pid, config and lease will be removed.

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.del_dhcp()
	"""
	pid = 0
	if os.path.isfile(self._dhcp_pid_file):
	with open(self._dhcp_pid_file, 'r') as f:
	pid = int(f.read())
	else:
	self._debug_msg('No DHCP client PID found')
	return None

	# stop dhclient, we need to call dhclient and tell it should release the
	# aquired IP address. tcpdump tells me:
	# 172.16.35.103.68 > 172.16.35.254.67: [bad udp cksum 0xa0cb -> 0xb943!] BOOTP/DHCP, Request from 00:50:56:9d:11:df, length 300, xid 0x620e6946, Flags [none] (0x0000)
	# Client-IP 172.16.35.103
	# Client-Ethernet-Address 00:50:56:9d:11:df
	# Vendor-rfc1048 Extensions
	# Magic Cookie 0x63825363
	# DHCP-Message Option 53, length 1: Release
	# Server-ID Option 54, length 4: 172.16.35.254
	# Hostname Option 12, length 10: "vyos"
	#
	cmd = '/sbin/dhclient -cf {} -pf {} -lf {} -r {}'.format(
	self._dhcp_cfg_file, self._dhcp_pid_file, self._dhcp_lease_file, self.config['ifname'])
	self._cmd(cmd)

	# cleanup old config file
	if os.path.isfile(self._dhcp_cfg_file):
	os.remove(self._dhcp_cfg_file)

	# cleanup old pid file
	if os.path.isfile(self._dhcp_pid_file):
	os.remove(self._dhcp_pid_file)

	# cleanup old lease file
	if os.path.isfile(self._dhcp_lease_file):
	os.remove(self._dhcp_lease_file)


	def _set_dhcpv6(self):
	"""
	Configure interface as DHCPv6 client. The dhclient binary is automatically
	started in background!

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.set_dhcpv6()
	"""
	dhcpv6 = self.get_dhcpv6_options()

	# better save then sorry .. should be checked in interface script
	# but if you missed it we are safe!
	if dhcpv6['dhcpv6_prm_only'] and dhcpv6['dhcpv6_temporary']:
	raise Exception('DHCPv6 temporary and parameters-only options are mutually exclusive!')

	# render DHCP configuration
	tmpl = jinja2.Template(dhcpv6_cfg)
	dhcpv6_text = tmpl.render(dhcpv6)
	with open(self._dhcpv6_cfg_file, 'w') as f:
	f.write(dhcpv6_text)

	# no longer accept router announcements on this interface
	self._write_sysfs('/proc/sys/net/ipv6/conf/{}/accept_ra'
	.format(self.config['ifname']), 0)

	# assemble command-line to start DHCPv6 client (dhclient)
	cmd = 'start-stop-daemon --start --quiet --pidfile ' + \
	self._dhcpv6_pid_file
	cmd += ' --exec /sbin/dhclient --'
	# now pass arguments to dhclient binary
	cmd += ' -6 -nw -cf {} -pf {} -lf {}'.format(
	self._dhcpv6_cfg_file, self._dhcpv6_pid_file, self._dhcpv6_lease_file)

	# add optional arguments
	if dhcpv6['dhcpv6_prm_only']:
	cmd += ' -S'
	if dhcpv6['dhcpv6_temporary']:
	cmd += ' -T'

	cmd += ' {}'.format(self.config['ifname'])
	return self._cmd(cmd)


	def _del_dhcpv6(self):
	"""
	De-configure interface as DHCPv6 clinet. All auto generated files like
	pid, config and lease will be removed.

	Example:

	>>> from vyos.ifconfig import Interface
	>>> j = Interface('eth0')
	>>> j.del_dhcpv6()
	"""
	pid = 0
	if os.path.isfile(self._dhcpv6_pid_file):
	with open(self._dhcpv6_pid_file, 'r') as f:
	pid = int(f.read())
	else:
	self._debug_msg('No DHCPv6 client PID found')
	return None

	# stop dhclient
	cmd = 'start-stop-daemon --stop --quiet --pidfile {}'.format(self._dhcpv6_pid_file)
	self._cmd(cmd)

	# accept router announcements on this interface
	self._write_sysfs('/proc/sys/net/ipv6/conf/{}/accept_ra'
	.format(self.config['ifname']), 1)

	# cleanup old config file
	if os.path.isfile(self._dhcpv6_cfg_file):
	os.remove(self._dhcpv6_cfg_file)

	# cleanup old pid file
	if os.path.isfile(self._dhcpv6_pid_file):
	os.remove(self._dhcpv6_pid_file)

	# cleanup old lease file
	if os.path.isfile(self._dhcpv6_lease_file):
	os.remove(self._dhcpv6_lease_file)

	def op_show_interface_stats(self):
	stats = self.get_interface_stats()
	rx = [['bytes','packets','errors','dropped','overrun','mcast'],[stats['rx_bytes'],stats['rx_packets'],stats['rx_errors'],stats['rx_dropped'],stats['rx_over_errors'],stats['multicast']]]
	tx = [['bytes','packets','errors','dropped','carrier','collisions'],[stats['tx_bytes'],stats['tx_packets'],stats['tx_errors'],stats['tx_dropped'],stats['tx_carrier_errors'],stats['collisions']]]
	output = "RX: \n"
	output += tabulate(rx,headers="firstrow",numalign="right",tablefmt="plain")
	output += "\n\nTX: \n"
	output += tabulate(tx,headers="firstrow",numalign="right",tablefmt="plain")
	print(' '.join(('\n'+output.lstrip()).splitlines(True)))

	def get_interface_stats(self):
	interface_stats = dict()
	devices = [f for f in glob.glob("/sys/class/net/**/statistics")]
	for dev_path in devices:
	metrics = [f for f in glob.glob(dev_path +"/**")]
	dev = re.findall(r"/sys/class/net/(.*)/statistics",dev_path)[0]
	dev_dict = dict()
	for metric_path in metrics:
	metric = metric_path.replace(dev_path+"/","")
	if isfile(metric_path):
	data = open(metric_path, 'r').read()[:-1]
	dev_dict[metric] = int(data)
	interface_stats[dev] = dev_dict

	return interface_stats[self.config['ifname']]

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