blob: 3715e5de46c61352b12f8479bdd128f6d207c780 (
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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
|
.. _vpn-dmvpn:
DMVPN
-----
**D** ynamic **M** ultipoint **V** irtual **P** rivate **N** etworking
DMVPN is a dynamic VPN technology originally developed by Cisco. While their
implementation was somewhat proprietary, the underlying technologies are
actually standards based. The three technologies are:
* **NHRP** - NBMA Next Hop Resolution Protocol :rfc:`2332`
* **mGRE** - Multipoint Generic Routing Encapsulation / mGRE :rfc:`1702`
* **IPSec** - IP Security (too many RFCs to list, but start with :rfc:`4301`)
NHRP provides the dynamic tunnel endpoint discovery mechanism (endpoint
registration, and endpoint discovery/lookup), mGRE provides the tunnel
encapsulation itself, and the IPSec protocols handle the key exchange, and
crypto mechanism.
In short, DMVPN provides the capability for creating a dynamic-mesh VPN
network without having to pre-configure (static) all possible tunnel end-point
peers.
.. note:: DMVPN only automates the tunnel endpoint discovery and setup. A
complete solution also incorporates the use of a routing protocol. BGP is
particularly well suited for use with DMVPN.
Baseline Configuration:
**STEPS:**
#. Create tunnel config (`interfaces tunnel`)
#. Create nhrp (`protocols nhrp`)
#. Create ipsec vpn (optional, but recommended for security) (`vpn ipsec`)
The tunnel will be set to mGRE if for encapsulation `gre` is set, and no
`remote-ip` is set. If the public ip is provided by DHCP the tunnel `local-ip`
can be set to "0.0.0.0". If you do set the `remote-ip` directive at any point, the interface will need to be `delete`'d from the config and recreated without the `remote-ip` config ever being set.
.. figure:: ../_static/images/vpn_dmvpn_topology01.png
:scale: 40 %
:alt: Baseline DMVPN topology
Baseline DMVPN topology
HUB Configuration
^^^^^^^^^^^^^^^^^
.. code-block:: console
interfaces
tunnel <tunN> {
address <ipv4>
encapsulation gre
local-ip <public ip>
multicast enable
description <txt>
parameters {
ip {
<usual IP options>
}
}
}
}
protocols {
nhrp {
tunnel <tunN> {
cisco-authentication <key phrase>
holding-time <seconds>
multicast dynamic
redirect
}
}
}
vpn {
ipsec {
esp-group <text> {
lifetime <30-86400>
mode tunnel
pfs enable
proposal <1-65535> {
encryption aes256
hash sha1
}
proposal <1-65535> {
encryption 3des
hash md5
}
}
ike-group <text> {
key-exchange ikev1
lifetime <30-86400>
proposal <1-65535> {
encryption aes256
hash sha1
}
proposal <1-65535> {
encryption aes128
hash sha1
}
}
ipsec-interfaces {
interface <ethN>
}
profile <text> {
authentication {
mode pre-shared-secret
pre-shared-secret <key phrase>
}
bind {
tunnel <tunN>
}
esp-group <text>
ike-group <text>
}
}
}
HUB Example Configuration:
.. code-block:: console
set interfaces ethernet eth0 address '198.51.100.41/30'
set interfaces ethernet eth1 address '192.168.1.1/24'
set system host-name 'HUB'
set interfaces tunnel tun0 address 10.0.0.1/24
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-ip 198.51.100.41
set interfaces tunnel tun0 multicast enable
set interfaces tunnel tun0 parameters ip key 1
set protocols nhrp tunnel tun0 cisco-authentication SECRET
set protocols nhrp tunnel tun0 holding-time 300
set protocols nhrp tunnel tun0 multicast dynamic
set protocols nhrp tunnel tun0 redirect
set vpn ipsec ipsec-interfaces interface eth0
set vpn ipsec ike-group IKE-HUB proposal 1
set vpn ipsec ike-group IKE-HUB proposal 1 encryption aes256
set vpn ipsec ike-group IKE-HUB proposal 1 hash sha1
set vpn ipsec ike-group IKE-HUB proposal 2 encryption aes128
set vpn ipsec ike-group IKE-HUB proposal 2 hash sha1
set vpn ipsec ike-group IKE-HUB lifetime 3600
set vpn ipsec esp-group ESP-HUB proposal 1 encryption aes256
set vpn ipsec esp-group ESP-HUB proposal 1 hash sha1
set vpn ipsec esp-group ESP-HUB proposal 2 encryption 3des
set vpn ipsec esp-group ESP-HUB proposal 2 hash md5
set vpn ipsec esp-group ESP-HUB lifetime 1800
set vpn ipsec esp-group ESP-HUB pfs dh-group2
set vpn ipsec profile NHRPVPN
set vpn ipsec profile NHRPVPN authentication mode pre-shared-secret
set vpn ipsec profile NHRPVPN authentication pre-shared-secret SECRET
set vpn ipsec profile NHRPVPN bind tunnel tun0
set vpn ipsec profile NHRPVPN esp-group ESP-HUB
set vpn ipsec profile NHRPVPN ike-group IKE-HUB
set protocols static route 0.0.0.0/0 next-hop 1.1.1.2
set protocols static route 192.168.2.0/24 next-hop 10.0.0.2
set protocols static route 192.168.3.0/24 next-hop 10.0.0.3
HUB on AWS Configuration Specifics
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Setting this up on AWS will require a "Custom Protocol Rule" for protocol number "47" (GRE) Allow Rule in TWO places. Firstly on the VPC Network ACL, and secondly on the security group network ACL attached to the EC2 instance. This has been tested as working for the offical AMI image on the AWS Marketplace. (Locate the correct VPC and security group by navigating through the details pane below your EC2 instance in the AWS console)
SPOKE Configuration
^^^^^^^^^^^^^^^^^^^
SPOKE1 Configuration:
.. code-block:: console
interfaces
tunnel <tunN> {
address <ipv4>
encapsulation gre
local-ip <public ip>
multicast enable
description <txt>
parameters {
ip {
<usual IP options>
}
}
}
}
protocols {
nhrp {
tunnel <tunN> {
cisco-authentication <key phrase>
map <ipv4/net> {
nbma-address <ipv4>
register
}
holding-time <seconds>
multicast nhs
redirect
shortcut
}
}
}
vpn {
ipsec {
esp-group <text> {
lifetime <30-86400>
mode tunnel
pfs enable
proposal <1-65535> {
encryption aes256
hash sha1
}
proposal <1-65535> {
encryption 3des
hash md5
}
}
ike-group <text> {
key-exchange ikev1
lifetime <30-86400>
proposal <1-65535> {
encryption aes256
hash sha1
}
proposal <1-65535> {
encryption aes128
hash sha1
}
}
ipsec-interfaces {
interface <ethN>
}
profile <text> {
authentication {
mode pre-shared-secret
pre-shared-secret <key phrase>
}
bind {
tunnel <tunN>
}
esp-group <text>
ike-group <text>
}
}
}
SPOKE1 Example Configuration
.. code-block:: console
set interfaces ethernet eth0 address 'dhcp'
set interfaces ethernet eth1 address '192.168.2.1/24'
set system host-name 'SPOKE1'
set interfaces tunnel tun0 address 10.0.0.2/24
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-ip 0.0.0.0
set interfaces tunnel tun0 multicast enable
set interfaces tunnel tun0 parameters ip key 1
set protocols nhrp tunnel tun0 cisco-authentication 'SECRET'
set protocols nhrp tunnel tun0 map 10.0.0.1/24 nbma-address 198.51.100.41
set protocols nhrp tunnel tun0 map 10.0.0.1/24 'register'
set protocols nhrp tunnel tun0 multicast 'nhs'
set protocols nhrp tunnel tun0 'redirect'
set protocols nhrp tunnel tun0 'shortcut'
set vpn ipsec ipsec-interfaces interface eth0
set vpn ipsec ike-group IKE-SPOKE proposal 1
set vpn ipsec ike-group IKE-SPOKE proposal 1 encryption aes256
set vpn ipsec ike-group IKE-SPOKE proposal 1 hash sha1
set vpn ipsec ike-group IKE-SPOKE proposal 2 encryption aes128
set vpn ipsec ike-group IKE-SPOKE proposal 2 hash sha1
set vpn ipsec ike-group IKE-SPOKE lifetime 3600
set vpn ipsec esp-group ESP-SPOKE proposal 1 encryption aes256
set vpn ipsec esp-group ESP-SPOKE proposal 1 hash sha1
set vpn ipsec esp-group ESP-SPOKE proposal 2 encryption 3des
set vpn ipsec esp-group ESP-SPOKE proposal 2 hash md5
set vpn ipsec esp-group ESP-SPOKE lifetime 1800
set vpn ipsec esp-group ESP-SPOKE pfs dh-group2
set vpn ipsec profile NHRPVPN
set vpn ipsec profile NHRPVPN authentication mode pre-shared-secret
set vpn ipsec profile NHRPVPN authentication pre-shared-secret SECRET
set vpn ipsec profile NHRPVPN bind tunnel tun0
set vpn ipsec profile NHRPVPN esp-group ESP-SPOKE
set vpn ipsec profile NHRPVPN ike-group IKE-SPOKE
set protocols static route 192.168.1.0/24 next-hop 10.0.0.1
set protocols static route 192.168.3.0/24 next-hop 10.0.0.3
SPOKE2 Configuration
.. code-block:: console
interfaces
tunnel <tunN> {
address <ipv4>
encapsulation gre
local-ip <public ip>
multicast enable
description <txt>
parameters {
ip {
<usual IP options>
}
}
}
}
protocols {
nhrp {
tunnel <tunN> {
cisco-authentication <key phrase>
map <ipv4/net> {
nbma-address <ipv4>
register
}
holding-time <seconds>
multicast nhs
redirect
shortcut
}
}
}
vpn {
ipsec {
esp-group <text> {
lifetime <30-86400>
mode tunnel
pfs enable
proposal <1-65535> {
encryption aes256
hash sha1
}
proposal <1-65535> {
encryption 3des
hash md5
}
}
ike-group <text> {
key-exchange ikev1
lifetime <30-86400>
proposal <1-65535> {
encryption aes256
hash sha1
}
proposal <1-65535> {
encryption aes128
hash sha1
}
}
ipsec-interfaces {
interface <ethN>
}
profile <text> {
authentication {
mode pre-shared-secret
pre-shared-secret <key phrase>
}
bind {
tunnel <tunN>
}
esp-group <text>
ike-group <text>
}
}
}
SPOKE2 Example Configuration
.. code-block:: console
set interfaces ethernet eth0 address 'dhcp'
set interfaces ethernet eth1 address '192.168.3.1/24'
set system host-name 'SPOKE2'
set interfaces tunnel tun0 address 10.0.0.3/24
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-ip 0.0.0.0
set interfaces tunnel tun0 multicast enable
set interfaces tunnel tun0 parameters ip key 1
set protocols nhrp tunnel tun0 cisco-authentication SECRET
set protocols nhrp tunnel tun0 map 10.0.0.1/24 nbma-address 198.51.100.41
set protocols nhrp tunnel tun0 map 10.0.0.1/24 register
set protocols nhrp tunnel tun0 multicast nhs
set protocols nhrp tunnel tun0 redirect
set protocols nhrp tunnel tun0 shortcut
set vpn ipsec ipsec-interfaces interface eth0
set vpn ipsec ike-group IKE-SPOKE proposal 1
set vpn ipsec ike-group IKE-SPOKE proposal 1 encryption aes256
set vpn ipsec ike-group IKE-SPOKE proposal 1 hash sha1
set vpn ipsec ike-group IKE-SPOKE proposal 2 encryption aes128
set vpn ipsec ike-group IKE-SPOKE proposal 2 hash sha1
set vpn ipsec ike-group IKE-SPOKE lifetime 3600
set vpn ipsec esp-group ESP-SPOKE proposal 1 encryption aes256
set vpn ipsec esp-group ESP-SPOKE proposal 1 hash sha1
set vpn ipsec esp-group ESP-SPOKE proposal 2 encryption 3des
set vpn ipsec esp-group ESP-SPOKE proposal 2 hash md5
set vpn ipsec esp-group ESP-SPOKE lifetime 1800
set vpn ipsec esp-group ESP-SPOKE pfs dh-group2
set vpn ipsec profile NHRPVPN
set vpn ipsec profile NHRPVPN authentication mode pre-shared-secret
set vpn ipsec profile NHRPVPN authentication pre-shared-secret SECRET
set vpn ipsec profile NHRPVPN bind tunnel tun0
set vpn ipsec profile NHRPVPN esp-group ESP-SPOKE
set vpn ipsec profile NHRPVPN ike-group IKE-SPOKE
set protocols static route 192.168.1.0/24 next-hop 10.0.0.1
set protocols static route 192.168.2.0/24 next-hop 10.0.0.2
|
