Prestige 334 User’s Guide
173
Chapter 15 VPN Screens
Peer Content
The configuration of the peer content depends on the peer ID type.
•
For
IP
, type the IP address of the computer with which you will make the
VPN connection. If you configure this field to
0.0.0.0
or leave it blank, the
Prestige will use the address in the
Secure Gateway Address
field (refer
to the
Secure Gateway Address
field description).
•
For
DNS
or
, type a domain name or e-mail address by which to
identify the remote IPSec router. Use up to 31 ASCII characters including
spaces, although trailing spaces are truncated. The domain name or e-mail
address is for identification purposes only and can be any string.
It is recommended that you type an IP address other than
0.0.0.0
or use the
DNS
or
ID type in the following situations:
•
When there is a NAT router between the two IPSec routers.
When you want the Prestige to distinguish between VPN connection requests
that come in from remote IPSec routers with dynamic WAN IP addresses.
IKE Phase 1
A phase 1 exchange establishes an IKE SA (Security Association).
Negotiation Mode
Select
Main
or
Aggressive
from the drop-down list box. The Prestige's
negotiation mode should be identical to that on the remote secure gateway.
Encryption Algorithm
Select
DES
or
3DES
from the drop-down list box. The Prestige's encryption
algorithm should be identical to the secure remote gateway. When DES is
used for data communications, both sender and receiver must know the same
secret key, which can be used to encrypt and decrypt the message. The DES
encryption algorithm uses a 56-bit key. Triple DES (3DES) is a variation on
DES that uses a 168-bit key. As a result, 3DES is more secure than DES. It
also requires more processing power, resulting in increased latency and
decreased throughput.
Authentication
Algorithm
Select
SHA1
or
MD5
from the drop-down list box. The Prestige's
authentication algorithm should be identical to the secure remote gateway.
MD5 (Message Digest 5) and SHA1 (Secure Hash Algorithm) are hash
algorithms used to authenticate the source and integrity of packet data. The
SHA1 algorithm is generally considered stronger than MD5, but is slower.
Select
SHA-1
for maximum security.
SA Life Time
Define the length of time before an IKE SA automatically renegotiates in this
field. It may range from 60 to 3,000,000 seconds (almost 35 days). A short SA
Life Time increases security by forcing the two VPN gateways to update the
encryption and authentication keys. However, every time the VPN tunnel
renegotiates, all users accessing remote resources are temporarily
disconnected.
Key Group
You must choose a key group for phase 1 IKE setup.
DH1
(default) refers to
Diffie-Hellman Group 1 a 768 bit random number.
DH2
refers to Diffie-Hellman
Group 2 a 1024 bit (1Kb) random number.
Pre-Shared Key
Type your pre-shared key in this field. A pre-shared key identifies a
communicating party during a phase 1 IKE negotiation. It is called "pre-
shared" because you have to share it with another party before you can
communicate with them over a secure connection.
IKE Phase 2
A phase 2 exchange uses the IKE SA established in phase 1 to negotiate the
SA for IPSec.
Encapsulation Mode
Select
Tunnel
mode or
Transport
mode from the drop down list-box. The
Prestige's encapsulation mode should be identical to the secure remote
gateway.
Table 52
VPN IKE: Advanced
LABEL
DESCRIPTION
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
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268
269
270
271
272
273
274
275
276
277
278
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280
281
282
283
284
285
286
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288
289
290
291
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293
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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
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341
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343
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353
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356
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358
359
360
361
362
363
364
365
366
