Draytek Vigor2133 User Manual page 239

IPSec VPN with the
Same subnet
Vigor2133 Series User's Guide
default value is 0.0.0.0, which means the Vigor router will
get a remote Gateway PPP IP address from the remote router
during the IPCP negotiation phase. If the PPP IP address is
fixed by remote side, specify the fixed IP address here. Do
not change the default value if you do not select PPTP or
L2TP.
Remote Network IP/ Remote Network Mask - Add a static
route to direct all traffic destined to this Remote Network IP
Address/Remote Network Mask through the VPN connection.
For IPsec, this is the destination clients IDs of phase 2 quick
mode.
Local Network IP / Local Network Mask - Display the local
network IP and mask for TCP / IP configuration. You can
modify the settings if required.
More - Add a static route to direct all traffic destined to
more Remote Network IP Addresses/ Remote Network Masks
through the VPN connection. This is usually used when you
find there are several subnets behind the remote VPN router.
RIP Direction - The option specifies the direction of RIP
(Routing Information Protocol) packets. You can
enable/disable one of direction here. Herein, we provide
four options: TX/RX Both, TX Only, RX Only, and Disable.
From first subnet to remote network, you have to do - If
the remote network only allows you to dial in with single IP,
please choose NAT, otherwise choose Route.
Change default route to this VPN tunnel - Check this box to
change the default route with this VPN tunnel.
For both ends (e.g., different sections in a company) are
within the same subnet, there is a function which allows you
to build Virtual IP mapping between two ends. Thus, when
VPN connection established, the router will change the IP
address according to the settings configured here and block
sessions which are not coming from the IP address defined in
the Virtual IP Mapping list.
After checking the box of IPSec VPN with the Same subnet,
the options under TCP/IP Network Settings will be changed
as shown below:
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