UTT Technologies
Chapter 10 VPN
http://www.uttglobal.com
Page
20520520
Figure 11-29 IPSec List – UTT VPN Gateway and UTT VPN Gateway (Bidirectional)
9.5.5.2
Answer-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 (see
Figure 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
Internet
connection).