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Chapter 17 VPN
EMG5324-D10A User’s Guide
218
addresses of their IPSec routers. The telecommuters must all use the same IPSec parameters but
the local IP addresses (or ranges of addresses) should not overlap.
Figure 115 Telecommuters Sharing One VPN Rule Example
17.6.11.2 Telecommuters Using Unique VPN Rules Example
In this example the telecommuters (A, B and C in the figure) use IPSec routers with domain names
that are mapped to their dynamic WAN IP addresses (use Dynamic DNS to do this).
With aggressive negotiation mode (see Section 17.6.6 on page 215), the Device can use the ID
types and contents to distinguish between VPN rules. Telecommuters can each use a separate VPN
rule to simultaneously access a Device at headquarters. They can use different IPSec parameters.
The local IP addresses (or ranges of addresses) of the rules configured on the Device at
headquarters can overlap. The local IP addresses of the rules configured on the telecommuters’
IPSec routers should not overlap.
See the following table and figure for an example where three telecommuters each use a different
VPN rule for a VPN connection with a Device located at headquarters. The Device at headquarters
(HQ in the figure) identifies each incoming SA by its ID type and content and uses the appropriate
VPN rule to establish the VPN connection.
Table 77 Telecommuters Sharing One VPN Rule Example
FIELDS TELECOMMUTERS HEADQUARTERS
My IP Address: 0.0.0.0 (dynamic IP address
assigned by the ISP)
Public static IP address
Secure Gateway IP
Address:
Public static IP address 0.0.0.0 With this IP address only
the telecommuter can initiate the IPSec
tunnel.
Local IP Address: Telecommuter A: 192.168.2.12
Telecommuter B: 192.168.3.2
Telecommuter C: 192.168.4.15
192.168.1.10
Remote IP
Address:
192.168.1.10 0.0.0.0 (N/A)
LAN
192.168.2.12
LAN
192.168.3.2
LAN
192.168.4.15
A
B
C
LAN
192.168.1.10
HQ