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IPSec NAT Traversal
4-Port SSL/IPSec VPN Router
Appendix J
Configuration of the One-to-One NAT Rules
The one-to-one NAT rules must be configured on
NAT 2 - RV042 and NAT 1 - RVO42.
One-to-One NAT Rule on NAT 2 - RV042
192.168.99.1 => 192.168.111.11
Refer to the documentation of the 10/100 4-Port VPN
Router (model number: RV042) for more details about
one-to-one NAT rules.
One-to-One NAT Rule on NAT 1 - RV042
192.168.111.11 => 192.168.11.101
Configuration of Router B
Set the Remote Security Gateway to IP address:
192.168.99.1, which is the one-to-one NAT IP address used
by NAT 2 - RV042.
Follow these instructions for Router B.
Launch the web browser for a networked computer,
designated PC 2.
Access the web-based utility of the Router B. (Refer to
“Chapter 4: Advanced Configuration” for details.)
Click the IPSec VPN tab.
Click the Gateway to Gateway tab.
Enter a name in the Tunnel Name field.
For the VPN Tunnel setting, select Enable.
The WAN IP address of the Router B will be automatically
detected.
For the Local Security Group Type, select Subnet. Enter
Router B’s local network settings in the IP Address and
Subnet Mask fields.
For the Remote Security Gateway Type, select IP
address. Enter 192.168.99.1 in the IP Address field.
Router B’s IPSec VPN Settings
1.
2.
3.
4.
5.
6.
7.
8.
Configuration of Scenario 2
In this scenario, Router B is the RVL200 Initiator, while
Router A is the RVL200 Responder. Router B will have
the Remote Security Gateway IP address set to a public
IP address that is associated with the WAN IP address of
Router A, which is behind the NAT. Hence the public IP
address (192.168.99.1) must be mapped to the WAN IP
address (192.168.11.101, a private IP address) of Router A
through the two one-to-one NAT rules:
192.168.99.1 => 192.168.111.11 (on NAT 2)
192.168.111.11 => 192.168.11.101 (on NAT 1)
192.168.1.101
192.168.2.100
WAN: 192.168.99.22
Router B - RVL200
Initiator
LAN: 192.168.2.0/24
WAN: 192.168.99.11
NAT 2 - RV042
LAN: 192.168.111.1
WAN: 192.168.111.101
NAT 1 - RV042
LAN: 192.168.11.1
WAN: 192.168.11.101
Router A - RVL200 Responder
LAN: 192.168.1.0/24
Traffic in Scenario 2
NOTE: Both the IPSec initiator and responder
must support the mechanism for detecting the
NAT router in the path and changing to a new
port, as defined in RFC 3947.
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