Chapter 4 Create Secure Connections Across the Internet
ZyWALL USG 20-2000 User’s Guide
73
• Destination: 192.168.11.0
• Next Hop: VPN Tunnel 2
4.2.1 What Can Go Wrong
Consider the following when using the VPN concentrator.
• The local IP addresses configured in the VPN rules should not overlap.
• The concentrator must have at least one separate VPN rule for each spoke. In the local policy,
specify the IP addresses of the networks with which the spoke is to be able to have a VPN tunnel.
This may require you to use more than one VPN rule for each spoke.
• To have all Internet access from the spoke routers go through the VPN tunnel, set the VPN rules
in the spoke routers to use 0.0.0.0 (any) as the remote IP address.
• Your firewall rules can still block VPN packets.
• If on a USG ZyWALL or ZyWALL 1050 the concentrator’s VPN tunnels are members of a single
zone, make sure it is not set to block intra-zone traffic.
4.3 Hub-and-spoke IPSec VPN Without VPN Concentrator
Here is an example of a hub-and-spoke VPN that does not use the ZyWALL’s VPN concentrator
feature. Here branch office A has a ZyNOS-based ZyWALL and headquarters (HQ) and branch office
B have ZLD-based ZyWALLs.
• Branch A’s ZyWALL uses one VPN rule to access both the headquarters (HQ) network and branch
B’s network.
• Branch B’s ZyWALL uses one VPN rule to access both the headquarters and branch A’s networks.
Figure 30
Hub-and-spoke VPN Example
This hub-and-spoke VPN example uses the following settings.
Branch Office A (ZyNOS-based ZyWALL):
Gateway Policy (Phase 1):
• My Address: 10.0.0.2
• Primary Remote Gateway: 10.0.0.1
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
