Prestige 334 User’s Guide
323
Chapter 34 VPN/IPSec Setup
34.4 Manual Setup
You only configure
Menu 27.1.1.2 – Manual Setup
when you select
Manual
in the
Key
Management
field in
Menu 27.1.1 – IPSec Setup
. Manual key management is useful if you
have problems with
IKE
key management.
Authentication
Algorithm
MD5
(Message Digest 5) and
SHA1
(Secure Hash Algorithm) are hash algorithms
used to authenticate packet data. The
SHA1
algorithm is generally considered stron-
ger than
MD5
, but is slightly slower.
Press [SPACE BAR] to choose from
SHA1
or
MD5
and then press [ENTER].
SA Life Time
(Seconds)
Define the length of time before an IKE Security Association automatically renegoti-
ates 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.
Phase 2
Active Protocol Press [SPACE BAR] to choose from
ESP
or
AH
and then press [ENTER]. See
earlier for a discussion of these protocols.
Encryption
Algorithm
Press [SPACE BAR] to choose from
NULL
,
3DES
or
DES
and then press [ENTER].
Select
NULL
to set up a tunnel without encryption.
Authentication
Algorithm
Press [SPACE BAR] to choose from
SHA1
or
MD5
and then press [ENTER].
SA Life Time
(Seconds)
Define the length of time before an IPSec Security Association automatically
renegotiates in this
field. It
may range from 60 to 3,000,000 seconds (almost 35
days).
Encapsulation Press [SPACE BAR] to choose from
Tunnel
mode
or
Transport
mode and then
press [ENTER]. See earlier for a discussion of these.
Perfect Forward
Secrecy (PFS)
Perfect Forward Secrecy (PFS) is disabled (
None
) by default in phase 2 IPSec SA
setup. This allows faster IPSec setup, but is not so secure. Press [SPACE BAR] and
choose from
DH1
or
DH2
to enable PFS.
DH1
refers to Diffie-Hellman Group 1 a 768
bit random number.
DH2
refers to Diffie-Hellman Group 2 a 1024 bit (1Kb) random
number (more secure, yet slower).
When you have completed this menu, press [ENTER] at the prompt “Press ENTER to Confirm…” to
save your configuration, or press [ESC] at any time to cancel.
Table 106
Menu 27.1.1.1 IKE Setup
FIELD
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
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
