Cisco Systems RVL200 manual One-to-One NAT Rule on NAT 2 RV042, One-to-One NAT Rule on NAT 1 RV042

Appendix J IPSec NAT Traversal

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)

WAN: 192.168.99.11	WAN: 192.168.99.22
NAT 2 - RV042	Router B - RVL200
LAN: 192.168.111.1	Initiator
	LAN: 192.168.2.0/24

WAN: 192.168.111.101

NAT 1 - RV042

LAN: 192.168.11.1

192.168.2.100

WAN: 192.168.11.101

Router A - RVL200 Responder

LAN: 192.168.1.0/24

192.168.1.101

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.

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.

1.Launch the web browser for a networked computer, designated PC 2.

2.Access the web-based utility of the Router B. (Refer to “Chapter 4: Advanced Configuration” for details.)

3.Click the IPSec VPN tab.

4.Click the Gateway to Gateway tab.

5.Enter a name in the Tunnel Name field.

6.For the VPN Tunnel setting, select Enable.

7.TheWAN 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.

8.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

4-Port SSL/IPSec VPN Router 89