UTT HiPER 840G Advanced Configuration Manual page 172

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Figure 11-29 IPSec List – UTT VPN Gateway and UTT VPN Gateway (Bidirectional)
9.5.5.2Answer-Only (Static-to-Dynamic IPSec VPN)
If the local UTT VPN gateway has a static IP address, and the remote endpoint
(another UTT VPN gateway or compatible VPN appliance) has a dynamically assigned IP
address (PPPoE or DHCP), you can choose Answer-Only as the connection type. In this
case, the local UTT VPN gateway can only act as a responder, and both IPSec endpoints
should use aggressive mode for phase 1 IKE negotiation.
Figure 11-30 Network Topology – UTT VPN Gateway to UTT VPN Gateway (Answer-Only)
In this scenario (seeFigure 11-30 Network Topology – UTT VPN Gateway to UTT VPN
Gateway (Answer-Only)), we deploy two UTT VPN gateways at a company: one is
located at the head office and connected to the Internet with a static IP address; the other
is located at the branch office and connected to the Internet with a dynamic IP address
(DHCP
http://www.uttglobal.com
Internet
Chapter 10 VPN
connection).
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