blob: ce07d7cc2f36189eef1f5d02f6f9daebeec2e7fc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
.. _quick-start:
###########
Quick Start
###########
This chapter will guide you on how to get up to speed using your new VyOS
system. It will show you a very basic configuration example that will provide
a :ref:`nat` gateway for a device with two network interfaces (`eth0` and
`eth1`).
.. _quick-start-configuration-mode:
Configuration Mode
##################
.. code-block:: none
vyos@vyos$ configure
vyos@vyos#
Commit and Save
################
After every configuration change you need to apply the changes by using the
.. code-block:: none
commit
Once your configuration works as expected you can save it permanently.
.. code-block:: none
save
Interface Configuration
#######################
* Your outside/WAN interface will be `eth0`, it receives it's interface address
be means of DHCP.
* Your internal/LAN interface is `eth1`. It uses a fixed IP address of
`192.168.0.1/24`.
After switching to :ref:`quick-start-configuration-mode` issue the following
commands:
.. code-block:: none
set interfaces ethernet eth0 address dhcp
set interfaces ethernet eth0 description 'OUTSIDE'
set interfaces ethernet eth1 address '192.168.0.1/24'
set interfaces ethernet eth1 description 'INSIDE'
SSH Management
##############
After switching to :ref:`quick-start-configuration-mode` issue the following
commands, and your system will listen on every interface for incoming SSH
connections. You might want to check the :ref:`ssh` chapter on how to listen
on specific addresses only.
.. code-block:: none
set service ssh port '22'
Configure DHCP/DNS Servers
##########################
* Provide DHCP service on your internal/LAN network where VyOS will act
as the default gateway and DNS server.
* Client IP addresses are assigned from the range ``192.168.0.9 -
192.168.0.254``
* DHCP leases will hold for one day (86400 seconds)
* VyOS will server as full DNS recursor - no need to bother the Google or
Cloudflare DNS servers (good for privacy)
* Only clients from your internal/LAN network can use the DNS resolver
.. code-block:: none
set service dhcp-server shared-network-name LAN subnet 192.168.0.0/24 default-router '192.168.0.1'
set service dhcp-server shared-network-name LAN subnet 192.168.0.0/24 dns-server '192.168.0.1'
set service dhcp-server shared-network-name LAN subnet 192.168.0.0/24 domain-name 'internal-network'
set service dhcp-server shared-network-name LAN subnet 192.168.0.0/24 lease '86400'
set service dhcp-server shared-network-name LAN subnet 192.168.0.0/24 range 0 start 192.168.0.9
set service dhcp-server shared-network-name LAN subnet 192.168.0.0/24 range 0 stop '192.168.0.254'
set service dns forwarding cache-size '0'
set service dns forwarding listen-address '192.168.0.1'
set service dns forwarding allow-from '192.168.0.0/24'
NAT
###
* Configure :ref:`source-nat` for our internal/LAN network
.. code-block:: none
set nat source rule 100 outbound-interface 'eth0'
set nat source rule 100 source address '192.168.0.0/24'
set nat source rule 100 translation address masquerade
Firewall
########
Add a set of firewall policies for our outside/WAN interface.
This configuration creates a proper stateful firewall that blocks all traffic
which was not initiated from the internal/LAN side first.
.. code-block:: none
set firewall name OUTSIDE-IN default-action 'drop'
set firewall name OUTSIDE-IN rule 10 action 'accept'
set firewall name OUTSIDE-IN rule 10 state established 'enable'
set firewall name OUTSIDE-IN rule 10 state related 'enable'
set firewall name OUTSIDE-LOCAL default-action 'drop'
set firewall name OUTSIDE-LOCAL rule 10 action 'accept'
set firewall name OUTSIDE-LOCAL rule 10 state established 'enable'
set firewall name OUTSIDE-LOCAL rule 10 state related 'enable'
set firewall name OUTSIDE-LOCAL rule 20 action 'accept'
set firewall name OUTSIDE-LOCAL rule 20 icmp type-name 'echo-request'
set firewall name OUTSIDE-LOCAL rule 20 protocol 'icmp'
set firewall name OUTSIDE-LOCAL rule 20 state new 'enable'
If you wanted to enable SSH access to your firewall from the outside/WAN
interface, you could create some additional rules to allow that kind of traffic.
These rules allow SSH traffic and rate limit it to 4 requests per minute. This
blocks brute-forcing attempts:
.. code-block:: none
set firewall name OUTSIDE-LOCAL rule 30 action 'drop'
set firewall name OUTSIDE-LOCAL rule 30 destination port '22'
set firewall name OUTSIDE-LOCAL rule 30 protocol 'tcp'
set firewall name OUTSIDE-LOCAL rule 30 recent count '4'
set firewall name OUTSIDE-LOCAL rule 30 recent time '60'
set firewall name OUTSIDE-LOCAL rule 30 state new 'enable'
set firewall name OUTSIDE-LOCAL rule 31 action 'accept'
set firewall name OUTSIDE-LOCAL rule 31 destination port '22'
set firewall name OUTSIDE-LOCAL rule 31 protocol 'tcp'
set firewall name OUTSIDE-LOCAL rule 31 state new 'enable'
Apply the firewall policies:
.. code-block:: none
set interfaces ethernet eth0 firewall in name 'OUTSIDE-IN'
set interfaces ethernet eth0 firewall local name 'OUTSIDE-LOCAL'
Commit changes, save the configuration, and exit configuration mode:
.. code-block:: none
vyos@vyos# commit
vyos@vyos# save
Saving configuration to '/config/config.boot'...
Done
vyos@vyos# exit
vyos@vyos$
Hardening
#########
Especially if you are allowing SSH remote access from the outside/WAN interface,
there are a few additional configuration steps that should be taken.
Replace the default `vyos` system user:
.. code-block:: none
set system login user myvyosuser level admin
set system login user myvyosuser authentication plaintext-password mysecurepassword
Set up :ref:`ssh_key_based_authentication`:
.. code-block:: none
set system login user myvyosuser authentication public-keys myusername@mydesktop type ssh-rsa
set system login user myvyosuser authentication public-keys myusername@mydesktop key contents_of_id_rsa.pub
Finally, try and SSH into the VyOS install as your new user. Once you have
confirmed that your new user can access your router without a password, delete
the original ``vyos`` user and probably disable password authentication for
:ref:`ssh` at all:
.. code-block:: none
delete system login user vyos
set service ssh disable-password-authentication
|
