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Chapter 17 VPN
EMG5324-D10A User’s Guide
202
the Device and remote IPSec router can send data between computers on the local network and
remote network. The following figure illustrates this.
Figure 104 VPN: IKE SA and IPSec SA
In this example, a computer in network A is exchanging data with a computer in network B. Inside
networks A and B, the data is transmitted the same way data is normally transmitted in the
networks. Between routers X and Y, the data is protected by tunneling, encryption, authentication,
and other security features of the IPSec SA. The IPSec SA is established securely using the IKE SA
that routers X and Y established first.
My IP Address
My IP Address is the WAN IP address of the Device. The Device has to rebuild the VPN tunnel if
My IP Address changes after setup.
The following applies if this field is configured as 0.0.0.0:
• The Device uses the current Device WAN IP address (static or dynamic) to set up the VPN tunnel.
Secure Gateway Address
Secure Gateway Address is the WAN IP address or domain name of the remote IPSec router
(secure gateway).
If the remote secure gateway has a static WAN IP address, enter it in the Secure Gateway
Address field. You may alternatively enter the remote secure gateway’s domain name (if it has
one) in the Secure Gateway Address field.
You can also enter a remote secure gateway’s domain name in the Secure Gateway Address field
if the remote secure gateway has a dynamic WAN IP address and is using DDNS. The Device has to
rebuild the VPN tunnel each time the remote secure gateway’s WAN IP address changes (there may
be a delay until the DDNS servers are updated with the remote gateway’s new WAN IP address).
Dynamic Secure Gateway Address
If the remote secure gateway has a dynamic WAN IP address and does not use DDNS, enter 0.0.0.0
as the secure gateway’s address. In this case only the remote secure gateway can initiate SAs. This
may be useful for telecommuters initiating a VPN tunnel to the company network (see Section
17.6.11 on page 217 for configuration examples).
A
X
Y
B
IPSec SA
IKE SA